Timstar - Science

A robust and easy to handle microscope with high-quality optics made of 100% coated glass for crisp and clear images. Specification: • Monocular head inclined 45°, with 360° rotation • x10 wide field eyepiece with graticule • x4, x10, and x40 (R) DIN Objectives • Coarse and fine rack and pinion focusing • 0.65 NA condenser • Tungsten 220V/20W illumination • Iris diaphragm with filter housing • Supplied with dust cover and blue filter • LIFETIME WARRANTY on optical components

Replacement tungsten bulb for microscopes. Suitable for SFC-100 range.

The BA50 is 3/4 size educational microscope with reversed nosepiece LED illumiation. Built-in batteries allow cordless operation. The rugged metal construction and precision mechanics should guarantee many years of use. Specification: • 3/4 size student microscope • Monocular head, inclined 45° and 360° rotating • Widefield eyepiece WF10X/18 mm with pointer • Reversed triple revolving nosepiece • Achromatic objectives 4X, 10X, 40X • Coarse and fine focusing system with tension adjustment • 0.65 N.A. condenser with disc diaphragm • LED illumination 20 mA, 3.5 V, 70 mW with intensity control • Includes dust cover, charger, batteries and calibration slide • Dust cover • 5 year warranty

A 3/4 sized basic microscope combining ease of operation with mechanical strength. Specification: • Vertical monocular head • x10 wide field eyepiece with pointer, lockable • x4, x10 and x40 objectives • Rack and pinion focusing • Rotary disc diaphragm • 42 mm plano-concave mirror • Coarse focussing system • Focussing stroke 28 mm • Dust cover included • 10 year warranty

A pack of 10, 3/4 sized basic microscope combining ease of operation with mechanical strength. Specification: • Vertical monocular head • x10 wide field eyepiece with pointer, lockable • x4, x10 and x40 objectives • Rack and pinion focusing • Rotary disc diaphragm • 42 mm plano-concave mirror • Coarse focussing system • Focussing stroke 28 mm • Dust cover included • 10 year warranty

Mechanical Stage for Microscopes, suitable for SFC-100 series, F-1110, F-1115,

Plastic carry case suitable for the following Motic Models: SFC-100FL, SFC-100FLED, F-1110 LED, F-1115 LED and DM-111. External dimensions 42 x 32 x 21 cm.

A routine biological microscope for schools. Simple to handle, the separate coarse and fine focus mechanism facilitates teaching. The LED illumination with NA 0.65 condenser works well up to 40X objective magnification. Specification: • Monocular head inclined 45°, with 360° rotation • x10 wide field eyepiece with pointer, lockable • x4, x10 x40 DIN Achromatic objectives • Quadruple nosepiece • Built in 0.65 condenser • Coarse and fine focusing • Iris diaphragm with filter holder and blue filter • LED 3.5V/70mW substage illumination • Includes dust cover • 5 year warranty

A routine biological microscope for schools. Simple to handle, the separate coarse and fine focus mechanism facilitates teaching. The LED illumination with NA 1.25 condenser works well with a 100X objective magnification. Specifications: • Monocular head inclined 45°, with 360° rotation • x10 wide field eyepiece with pointer, lockable • x4, x10 x40 DIN Achromatic objectives • Quadruple nosepiece • Built in 1.25 focusable Abbe condenser • Coarse and fine focusing • Iris diaphragm with filter holder and blue filter • Upper limit stop preset but adjustable • LED substage illumination • Includes dust cover • 5 year warranty

The unit is built on heavy cast-iron base. The movement is controlled by knob at the side of the base, and can be fixed in any position with clamping screw, and Vernier scale allows precise measurement to 0.01 mm. The carriage has two locations for the microscope, which allows it to be mounted with its axis in any position relative to travel. The microscope itself features 7x magnification Ramsden objective, 3x magnification 50 mm FL eyepiece, and cross-piece graticule, with rack-and-pinion focusing. Supplied in polished wooden case.

The unit is built on heavy cast-iron base with three levelling screws, with bubble level meter. The horizontal movement is controlled by knob at the left hand side of the base, and can be fixed in any position with clamping screw, and Vernier scale allows precise measurement to 0.02 mm. The total horizontal movement is 210 mm. Vertical movement is by rack-and-pinion, and has its own Vernier scale to 0.02 mm. The total vertical movement is 160 mm. The stage for placing objects for measurement is fitted with Perspex plate. The microscope can be clamped in either vertical or horizontal position, and features 10x magnification 50 mm F.L. achromatic eyepiece. Supplied in polished wooden case.

A model showing the Sun, Earth and Moon, correctly geared to show each month as the Earth orbits the Sun. The Sun is represented by bright lamp. It is particularly useful in demonstrating: Sun's apparent motion: changing length and direction of shadows during day and during season; night and day; changing length of days; seasons; phases of the Moon; eclipses of the Moon and Sun. Dimensions (L H) 650 250mm. Content includes: • Tellurium model • Stick-on model person • Model sundial • Earth axis extension • Two Earths and Moons • Date indicator • Phase of the Moon indicator • Eclipse shadow card, teaching guide • Electrical Operation: 6V transformer supplied

This hands-on model with teaching guide helps pupils understand the solar system including its shape, the sun as the source of its light, planetary orbits, the planets' names and which planets may be seen on given days. Requires 2 x AA batteries to light the sun. Height 100 mm. Diameter of largest Orbit 380 mm.

This item is designed to demonstrate the stabilizing effect of neutrons on the atomic nucleus. The ""protons"" are made of disc magnets while the ""neutrons"" are made of browned iron discs. The ""protons"" will, because they are magnetized, repel one another when placed on flat surface or overhead projector. The stabilizing effect of the ""neutrons"" is illustrated by placing them between the ""protons"", thereby eliminating the repulsive force. The ""protons"" are supplied with red marking, the ""neutrons"" with blue. Supplied as single pieces. The “neutron” can be ordered under product code MO150905.

This item is designed to demonstrate the stabilizing effect of neutrons on the atomic nucleus. The ""protons"" are made of disc magnets while the ""neutrons"" are made of browned iron discs. The ""protons"" will, because they are magnetized, repel one another when placed on flat surface or overhead projector. The stabilizing effect of the ""neutrons"" is illustrated by placing them between the ""protons"", thereby eliminating the repulsive force. The ""protons"" are supplied with red marking, the ""neutrons"" with blue. Supplied as single pieces. The “proton” can be ordered under product code MO150900.

Chain Reaction Apparatus, spare pins only.

Custom designed tongs for handling the radioactive sources RA95622 RA95626. Stainless steel construction. Dimensions (W x L): 12 x 165 mm.

Interface lead to link GM counter RA67530 to PC or laptop.

The Alpha particle Spark Detector from Frederiksen has been developed to enable visualization of alpha particles. The apparatus can be likened to a GM tube, but using atmospheric air instead of the diluted quenching gas in the tube. When alpha particles ionize the air in the spark gap of the detector, bright sparks can be both seen and heard. The apparatus incorporates a transparent lid, which allows clear observation of the sparks. The detector requires connection to safe high voltage (EHT) power supply with voltage range of 0-5 kV or 0-6 kV. The apparatus can be safely used directly on bench top or table and includes a removable threaded steel rod for mounting the unit on a radioactivity bench (RA95610) or squat retort base with thumbscrew (ST96274). • Gives clearly visible and audible response to alpha radiation • Demonstrates the ionization of air by alpha particles • Detects alpha radiation from radioactive minerals or radioactive sources • Allows study of range in air shielding by different materials

This GM counter is the most versatile and easily operated model yet. The counting time can be set to 1, 10, 60 or 100 seconds or set to manual start/stop. Counting may be set to run repeatedly and the last, complete result is displayed in the main display while new counts accumulate in the auxiliary display. The counter accepts both BNC and Jack type GM tubes. With the optional USB connection it can interface with computer and if pulse output for further hardware processing is required, that is also available. For demonstration purposes the authentic clicking Geiger-counter sound may be turned on if preferred. Other improvements over the previous model include lower overall system dead time and lower current consumption, with the unit now being powered by AA batteries. The counter may also be powered from the optional mains adapter.

Geiger-Muller Counter, Mains Adapter for RA67530.

A multipurpose GM tube, sensitive to alpha, beta and gamma radiation. Mounted in housing with protective cover and 10 mm diameter support rod. It is complete with integral lead and BNC connector. This GM tube does NOT have built-in anode resistor, and therefore requires counter with built-in anode resistor. Suitable for use with RA67530. • Window diameter: 9.14 mm • Recommended bias voltage: 500 V • BNC plug

This pack of 500 x 10 mm plastic cubes is used to investigate and demonstrate half-life. Each cube has one black face, the other faces all being yellow. The cubes are thrown or scattered like dice and those which land with the black face uppermost represent radioactive nuclei which have decayed. The black upward facing cubes are then removed, the remaining cubes thrown again and the process repeated. The removed cubes represent radioactive decay and decay curve can be plotted from the results.

This extra sensitive GM-tube has a large window which makes the detector well suited for measuring low activity sources. This provides more counts and thus improves counting statistics for more accurate determinations of half-lives, etc. The GM-tube housing is supplied with a protective cover as well as a protective grid in front of the window. It is sensitive to alpha, beta and gamma radiation. It is complete with a removable protective cap, holder, and integral lead with BNC plug. This GM tube does NOT have built-in anode resistor, and therefore requires counter with built-in anode resistor. Suitable for use with RA67530. • Useful diameter: 28.6 mm • Recommended supply voltage: 500 V • BNC plug

Fitted with a 10 mm diameter mounting rod, so the GM-tube may be held safely in the squat retort base.

A low cost apparatus for the demonstration of Rutherford scattering by means of gravitational analog of inverse square law repulsion. Comprises wooden launching ramp with guiding groove running down its curved front face along its length and index marks at 40, 60, 80 and 100 mm height above the base, that provides pre-determined launching heights. Also included is spun aluminium hill along with 19mm diameter steel ball. The shape of the aluminium hill has been carefully determined by varying its height above the base line by an amount arrived on the basis of the reciprocal of the radius. Ramp Dimensions (L x W x H): 300 x 50 x 105 mm. Hill Dimensions (Dia. x H): 280 x 60mm.

An instrument useful in showing the random nature of radiation, it produces spectacular bright sparks when alpha particles are ionised between the electrically charged circular wire grid and steel electrode. It comes complete with a sliding holder for an alpha radiation source, an accurate scale to measure the effects of distance between the source and the grid and is built in vacuum formed black plastic case. All of the electrical connections from an EHT power supply are through 4 mm insulated sockets. Connections to Timer Scaler and Frequency Meter are via BNC to BNC cable. Requires 5kV EHT power supply and alpha radiation source. Weight: 400g. Dimensions: (L x W x H) 310 x 77 x 85 mm.

A bench for radioactive sources and GM-tubes, providing stable and convenient setup, allowing reproducible results when making experiments with radioactivity. Investigate how the radioactive radiation spreads from the source in both angle and distance or investigate how radiation is absorbed by lead and aluminium. The bench is 60 cm in length, with a millimetre scale. Two riders are included, one for carrying a GM-tube, and the other for carrying the source holder*. The source holder can be fitted with a 6 mm diameter steel rod, for hanging absorber plates in front of the radioactive source. It can be rotated, and is fitted with degree scale ±110° - 1° • Lead plates: 5 x 2 mm thick, and 10 x 1 mm thick (enamelled to protect from lead contamination) • Aluminium plates: 6 x 2 mm thick, and 4 x 0.5 mm thick *Please note: This holder is only suitable for use with Frederiksen radioactive sources, which are available by special request only. The sealed radioactive sources can be used instead, with some limitations, using RA170800 source holder.

A multi-purpose instrument, combining the functions of a multi-purpose timer, ratemeter and frequency meter in one compact unit. It can be used as a simple stopwatch to more sophisticated applications such as dynamics experiments with air tracks etc. The scaler and ratemeter modes allow numerous radioactivity experiments to be undertaken. It has four, 7-segment LED digits 13 mm high. The high brightness and large size display make it ideal for classroom demonstrations. The microprocessor based design minimises the number of controls required and these are clearly labelled so that the instrument is very straightforward to use. The GM tube input is a TNC socket, TNC-to-BNC adaptor is required for connecting GM tube with BNC plug. Timer Four Auto Ranges: 0 to 9.999 s, 10 to 99.99 s, 100 to 999.9 s, 1000 to 9999 s Scaler Three Auto Ranges: 0 to 9.999 1000 counts, 10 to 99.99 1000 counts, 100 to 999.9 1000 counts Accuracy: ±0.01% Sensitivity: 160 mV peak Ratemeter Three Auto Ranges: 0 to 9.999 1000/s, 10 to 99.99 1000/s, 100 to 999.9 1000/s Frequency Meter Three Auto Ranges: 0 to 9.999 kHz, 10 to 99.99kHz, 100 to 999.9 kHz Max Input Signal: 20 rms Max Sensitivity: 250 mV rms Range: 10 Hz to MHz

The electron diffraction tube is highly evacuated tube with an electron gun consisting of pure tungsten heater filament and cylindrical anode all contained in clear glass bulb. The electrons emitted by the heated cathode are constrained to narrow beam by an aperture and are then focussed by means of an electron-optical system. The resulting tight, monochromatic beam then passes through micro-mesh nickel grating situated at the aperture of the gun. Onto this grid, thin layer of polycrystalline graphitised carbon has been deposited by vaporisation. This layer affects the electrons in the beam much like diffraction grating. The result of this diffraction is seen in the form of an image comprising two concentric rings that become visible on the fluorescent screen. spot resulting from the un-deflected electron beam continues to be visible at the centre of the rings. Also requires an EHT power supply. Specifications: • Max. filament voltage: 6.3 V AC • Max. anode voltage: 5 kV • Anode current: approx. 0.1 mA at 4 kV

The Fine Beam Tube is used for investigating the deflection of cathode rays in uniform magnetic field produced by pair of 300 mm Helmholtz coils. In addition, it can also be used for quantitative determination of the specific charge of an electron e/m. Located inside glass bulb with neon residual gas atmosphere is an electron gun, which consists of an indirectly heated oxide cathode, Wehnelt cylinder and perforated anode. The gas atoms are ionised along the path of the electrons and narrow, well-defined, luminescent beam is produced. Incorporated measurement marks facilitate parallax-free determination of the diameter of the circular path of the beam deflected in the magnetic field. The Fine Beam Tube is mounted on base with coloured connectors. In order to protect the tube, protective circuit is built into the base, which shuts off any voltage in excess of the base's pre-set cut-off voltage. The protective circuit prevents excessive voltages from damaging the heater filament and ensures ""smooth"" switch-on response once the voltage is applied. Requires 0-300 DC power supply and 300 mm Helmholtz coils. • Filament voltage: to 12 DC • Filament current: 300 to 450 mA • Anode voltage: 200 to 300 V • Anode current: 0.3 mA • Diameter of fine beam path: 20 to 120 mm • Division spacing: 20 mm • Tube diameter: 160 mm • Total height incl. base: 260 mm • Base plate: 115 115 35 mm • Weight: approx. 820 g

The Pair of Helmholtz coils is used for generating homogeneous magnetic field and for the determination of the specific charge of the electron e/m in conjunction with the dual-beam tube. The coils can be switched in parallel or in series. spring clip on the top crossbar is used to mount the Hall sensor during measurements of the magnetic field. The maximum field strength generated by the coils (~ mT) is approximately 750 times weaker than that produced by an MRI machine (~3 T), which are known to be safe for use by people with medical implants such as pacemakers. For use with RA130505. Requires 0-20 DC A power supply. • Coil Dimensions (Dia.): 300 mm • Coil spacing: 150 mm • Number of turns per coil: 124 • DC resistance: 1.2 ohms each • Maximum coil current: 5 A • Maximum coil voltage: 6 V • Maximum flux density at 5 A: 3.7 mT • Weight: 4.1 kg approx.

The dual beam tube can be used to determine the specific charge e/m from the diameter of the path followed by electrons fired into the tube from perpendicularly mounted gun with vertically aligned magnetic field and observation of the spiral path followed by electrons fired axially into coaxial magnetic field. The dual beam tube is partly evacuated electron tube, filled with helium at low pressure and equipped with both axial and perpendicular electron guns. The electron beams are perpendicular to one another and common deflector plate is provided for both guns. The electron beam source is an oxide cathode heated indirectly via heating coil. The electron paths show up as fine, slightly greenish beam due to impact excitation of the helium atoms. Requires 300 or 500 DC power supply. • Filament voltage: max. 7.5 AC/DC • Anode voltage: approx. 150 V DC • Max Anode current <30 mA • Deflector voltage: max. 50 V DC • Glass bulb: 130 mm dia. approx. • Total length: 260 mm approx.

For mounting all demonstration tubes and the optical equivalent. The tube holder consists of powder-coated cast aluminium with clamping fork made of heat resistant plastic and rotatable by 360°. The base plate contains two boreholes for mounting demonstration Helmholtz coils. Including an anti-skid support with three rubber feet. Weight: 1.5 kg. Supplied without tube. Dimensions 230 x 175 x 320 mm (L x W x H).

Pair of Helmholtz coils for generating a uniform magnetic field perpendicular to the axis of the Teltron D series tubes. Teltron Tube Holder D allows the coils to be configured in the Helmholtz geometry or to produce magnetic fields aligned vertically, or coaxial, with respect to the tube axis. The maximum field strength generated by the coils (~ 10 mT) is approximately 300 times weaker than that produced by an MRI machine (~ 3T), which are known to be safe for use by people with medical implants such as pacemakers. Specifications: Number of turns: 320 Max. continuous current: 1.0 A Max. momentary current: 10 min @ 1.5 A; 3 min @ 2 A Effective impedance: 6 Ω Max. field strength: approx. 10 mT Connectors: 4-mm sockets

For demonstrating the straight propagation of electron beams in field-free spaces by projecting the shadow of Maltese cross on fluorescent screen. Also intended for observing the focusing of electron beams by magnetic fields as an introduction to electron optics. The lower section of the maltese cross has hole 3 mm dia. which makes it possible to ascertain the orientation of the cross's shadow under the influence of magnetic fields. Specifications Max. filament voltage: 6.3 V AC Max. anode voltage: 5 kV Anode current: approx. 0.1 mA at 4 kV To perform experiments using the Maltese cross tube, the following equipment is also required: •1 Tube holder (RA67550) and •1 High voltage power supply 5 kV (115 V, 50/60 Hz) or 1 High voltage power supply 5 kV (230 V, 50/60 Hz) •1 Coil from Helmholtz pair of coils (RA67560) •1 DC Power Supply 20 V, 5 A (115 V, 50/60 Hz) or 1 DC Power Supply 20 V, 5 A (230 V, 50/60 Hz) •1 Bar magnet

Highly evacuated electron tube with focusing electron gun and fluorescent screen inclined relative to the beam axis, so that the path of the beam can be seen and the effects of electric and magnetic fields can be studied. The electron beam can be deflected electrically in the electric field of the built-in plate capacitor, and magnetically by using a Helmholtz coil pair D. By adjusting the electric field so that it cancels the magnetic deflection, it is possible to determine the specific charge e/m and the velocity of the electrons. Specifications: Filament voltage: 6.3 V AC Max. anode voltage: 5000 V Anode current: approx. 0.1 mA at 4000 V Max. capacitor voltage: 5000 V Fluorescent screen: approx. 90x60 mm² Glass bulb: approx. 130 mm dia. Total length: approx. 260 mm

For demonstrating the evidence of the particular nature of cathode rays, establishment of negative sign of charge, the ""electron"" as an atomic particle, concept of ""time-base"", operation of cathode ray oscilloscope, simple Lissajous' figures. The diode gun, tungsten wire ""hairpin"" filament and cylindrical collimating anode, projects narrow beam of cathode rays into the evacuated experimental zone. This beam traverses the sphere to impinge on the luminescent screen in spot about 4 mm in diameter. The narrow beam may be deflected in vertical plane to enter the Faraday cage by using Helmholtz Coils. further and horizontal deflection can be obtained using an Auxiliary Coil, thereby constructing simple cathode ray oscilloscope. All connections are made on the Universal Stand. Specifications Max. filament voltage: 6.3 V AC Max. anode voltage: 5 kV Max. capacitor voltage: 500 V Anode current: approx. 0.1 mA at 4 kV (anode)

Allows GM tube with BNC plug to connect to Scaler Timer Frequency Meter with TNC socket.

This demonstration model facilitates the understanding of how dynamo works, thanks to the open and exposed design. A mounted armature, comprising two coils of copper wire, is rotated about horizontal axis by turning the hand cranked drive wheel within magnetic field, created by the permanent U-magnet supplied with the unit. Mounted on plastic base with LED and two mm sockets for connection to measuring instruments. Drive Wheel Dimemsions (Dia.): 140 mm. Base Dimensions (W x L): 150 x 200 mm.

This unit can be used for variety of purposes to illustrate energy transfers: it can be used to lift mass or stretch bungee cord, and to generate an electrical current when the mass falls again or the bungee cord is released. It can also be turned by hand to generate current. The motor/generator (6-9 V) is mounted on robust metal base, and the gearing of the unit and the sizes of the pulleys have been chosen to enable variety of qualitative and quantitative experiments to be undertaken.

A hand driven pulley coupled to the smaller dynamo pulley by a rubber belt to give step-up ratio, to generate both AC and DC. Electrical output is via 2 pairs of 4 mm sockets (AC and DC) and two LEDs.

Belt for demonstration dynamo AC/DC HE53710.

This kit consists of two tubes (one copper, one plastic) and two discs (a supermagnet and an aluminium disc of similar size). When the supermagnet is dropped down the copper tube, it falls much more slowly than might be expected. The other tube/disc combinations do not show this effect, since eddy currents are only produced using the copper tube and the supermagnet. Tube Dimensions (L): 250mm.

Designed for student experiments in electromagnetism, this U-Shaped Electromagnet encourages students to discover and learn the relationship between electricity and magnetism. Requires standard laboratory power supply, maximum voltage 12 V DC. Weight: 0.3 kg. Dimensions (W x L xD): 100 x 150 x 50 mm.

This apparatus is used to study the effect of number of coils on the strength of an electromagnet. The effect of current on strength of the electromagnet can also be studied. The electromagnet coil has 4 mm sockets and tappings at 100, 200, 300, 400, 500 and 600 turns. A hook on the underside allows paper clips to be attached to indicate the strength of the electromagnet for each variable. A low voltage laboratory power supply is also required.

The Relay Demonstration Unit allows the investigation and study of how a relay functions, in a clear and practical manner. A useful property of this unit is that the circuit powering the coil is easily seen to be completely separate from the circuit switched on by the relay. This is one of the reasons relays are used where safe low voltage circuit can be used to control high voltage circuit. When current flows through the coil an electro-magnetic field is produced. This field attracts the iron armature whose end makes the contact, completing the circuit and illuminating the lamp. When the current is switched off, the contact will open again, switching the circuit off. Specifications: • Control input voltage: 2 V DC • Switched supply voltage: 12 V Max

All the components of an electric bell are mounted on a large panel. All wiring is visible and parts are large in size. Operates on 3-4 volts DC

To demonstrate the relationship between magnetism and electricity. Soft iron U-shaped core and keeper with hook. Dimensions (H x Dia.): 110 x 9 mm.

Useful for cores of electromagnets as soft iron loses its magnetism when the current in the coil is switched off, whereas steel retains some magnetism after the current is switched off. Dimensions (L x Dia.): 200 x 12 mm.