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2506 - Incandescent Light Source UQ Physics Workshop, Australia A pearl 240 V AC bayonet cap lamp, 40 W, is enclosed in a black sheet steel can on a wooden base. Two wing nuts allow the can to be removed for replacement of the lamp. |
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2508 - Microwave Transmitter (2.8 cm) Unilab, England Solid state microwave transmitter for teaching laboratory use. |
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2509 - Box of Electronic Instrument Manuals various, |
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2511 - Bank of Sensitrol Relays Model 705 Weston Electrical Instrument Corp., Usa The Sensitrol relay is based on a d'Arsonval meter movement with a sensitivity of about 30 µA. It is designed to indicate when an audio source is outside amplitude bounds, whether higher or lower. The meter needle strikes lower and upper contcts... |
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2512 - Resistor for Vehicle Ignition System unknown, Either one is connected between ignition coil and distributor, or one is connected between distributor and each spark plug. The resistor is screwed into the ignition lead. The resistor dampens the discharge in the ignition circuit, so that there is... |
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Philips, Germany The glass envelope is painted externally to reduce unwanted illumination. The filament is positioned at the focal length of a spherical mirror plated at the back of the interior. An intense narrow band of light projects through a circular unpainted... |
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2514 - Sweep Tube / Valve 6JS6A unknown, Japan Glass envelope, duodecal base, top cap. This valve was used in black and white television receivers for horizontal deflection of the electron beam in the cathode ray tube. This valve and similar ones were replaced by smaller types with double or... |
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2515 - Sweep Tube / valve PL509 unknown, (c. 1970) Glass envelope, magnoval base, top cap. This valve was used in early colour TV sets for horizontal deflection of the electron stream in a colour cathode ray tube. The extensive brown staining inside the envelope is barium from the cathode. This... |
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2516 - 270 Degree RPM Meter Model 536CS Paton Electrical, Australia This meter has a 270 degree d'Arsonval movement, 1 mA FSD. The central movement core has been magnetised radially. A single half-loop moves in the magnetic field. The movement is damped by an aluminium disc roatating between the poles of a permanent... |
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Griffin & George Ltd, England A jolly little rough and ready illumination comparator invented by Irish physicist, John Joly (1857-1933). Two blocks of translucent plastic sit side by side with a baffle between. One block is illuminated by a standard source at a fixed... |
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2519 - Scalamp Electrostatic Voltmeter 10 kV W.G. Pye & Co. Ltd., England This is an electrostatic attraction type voltmeter. The high voltage terminal is attached toan upright hollow cylinder with rounded edges. It attracts a copper plate suspended by a conducting fibre. The plate is part of a closed loop of copper... |
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2520 - Frequency Meter (400 Hz) A.J. William, Australia This meter would have been used for testing aircraft power systems that include 400 Hz 115 VAC, the higher frequency allowing weight to be saved on transformers and inductors. This meter uses phase discrimination circuits to generate DC voltages to... |
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2521 - Three Phase Power Factor Meter Model 658 Paton Electrical, Australia (1965) Used in conjunction with an external inductance for monitoring mains power circuits. |
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2522 - Variable Capacitor Type 1U9008 AWA, Australia (WW II) A moving plate variable capacitor for laboratory use. Range of 13 -45 pF using two gangs of variable capacitors in series. |
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2523 - Variable Inductor Type 2V9009 AWA (Amalgamated Wireless Australia), Australia (WW II) Variable inductor for laboratory use. It is based on a variometer from a tuning unit of military radio equipment. The range is from 20 to 180 µH. |
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Technitherm, Australia (c.1980) This mercury-in-glass thermometer tube was made by the owner of Technitherm in Mapleton, Q. to demonstrate the process to Dr Heckenberg. Since small variations in the volume of the bulb could not be eliminated, and these have a strong effect... |
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Vinson, Germany A paket of one hundred two inch square cover glasses. |
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2526 - Geiger Counter Filter Set Tennelec Nucleus Inc, Oxford, England A kit of filters to be used with a Geiger counter to investigate gamma rays (four discs of lead of differing thickness) and alpha and beta rays (seven discs of polyethylene of differing thickness.) |
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2527 - Lecture Demonstration Electric Motor unknown, Australia Simplified model of basic electric motor, suitable for use in lecture demonstrations. It has a permanent magnet and a two-arm rotor with interchangeable AC sliprings and DC commutator, on a wooden base. |
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2528 - Power Amplifier Type 2706 Bruel & Kjoer, Copenhagen, High quality linear audio amplifier for studio and laboratory use. It has a current limiter and an overload warning ('clipping') as well as 40dB variable attenuator. |
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2529 - Weston Volt-Ammeter Model 280 Weston Electrical Instrument Corp., Usa Moving coil meter suitable for DC current and voltage measurements. Use of an Ayrton Shunt allows larger currents to be measured. The ranges are: 60 mA / 0.6 A / 30 A ; 3V / 30 V / 150 V |
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2530 - V.M.L. Laboratory Voltmeter Victoria Meter Laboratory, Australia 1000 R/V (1 mA FSD) moving coil movement. |
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2531 - Variable Quenched Spark Gap unknown, Part of a wireless telegraphy transmitter from the first decade of the twentieth century. Four spark gaps are in series, one adjustable 0-2 mm, three adjustable 0-3 mm. Probably designed for use in the range 5-15 kV. The shafts are steel tipped... |
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2532 - Transmission Measuring Set Type 259 Transmission Products Pty Ltd, Australia Used for testing telephone lines and losses therein. 0 dB reference 1 mW across 600 ohms |
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2533 - Sine and Square Wave Generator Model 112 b.w.d. Electronics pty ltd, Australia Signal generator with sine or square wave output. Frequency ranges: 20-200 c/s, 200 c/s -2 Kc/s, 2- 20 Kc/s, 20-200 Kc/s, 200 kc/s- 1 Mc/s. Step attenuator and level control allow output level to be adjusted 0-20mV to 0-20V output. |
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The Leeds & Northrup Co., Usa Simple galvanometer for use as a null detector in bridge circuits. sensitivity not known |
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2535 - DC Resistance Bridge WB3 Paton, Australia Battery powered instrument that can be configured as Wheatstone, Varley or Murray bridge to find resistance of an unknown. it has a built-in null detector galvanometer. |
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2536 - Spare Brushes and Bcreens for van de Graaf Generator High Voltage Engineering Corporation, Usa These are spares for the 1 MeV van de Graaf generator, on display in the museum (item 28). The brushes spray charge onto the rubber belt, while the collector screens collect it at the top. |
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2537 - VHF TV Field Strength Meter Model 5901 Antiference (Australia) Pty Ltd, Australia Uses 3A5 double triode amplifier valve in a bridge circuit to measure strength of incoming TV signal. Frequency range TV channels 1-10 (about 46-215 MHz) Instructions printed on front panel of instrument. 300 ohm transmission line or 70 ohm... |
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Weston Electrical Instrument Corp., Usa Two Weston shunts and two from an unknown source. Shunts are used to increase the range of an ammeter by diverting most of the current around it in a controlled way. See markings on 5A shunt. |
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Master Instruments Pty Ltd, Australia Displays analogue telephone circuit voice traffic/hour in erlangs.The erlang is a dimensionless unit that is used in telephony as a measure of load on service-providing elements such as telephone circuits or telephone switching equipment. A... |
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2540 - UHF Wavemeter Type 1140-A General Radio Co., Cambridge, Mass., Usa A variable butterfly capacitor with an included loop in its construction forms a tuned circuit of good Q factor. Measures frequency in the range 250-1200 MHz. This unit was used at RMIT, Melbourne. |
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Electronics Workshop UQ Physics, Australia A Peltier thermoelectric device is mounted on a two inch minifin heatsink that maintains one side at a relatively constant temperature. The other side, coated if necessary with an absorbent paint, is heated by the laser beam and generates a voltage... |
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Tandy Corp USA trading as Intertan, China The kit allows a student or hobbyist to build radios by connecting wires between circuit blocks, following the instructions provided. Such kits were used in Science Fairs in the U.S.A. |
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2543 - Kent Portable Potentiometer PP322-1 Kent, A potentiometer is used to accurately measure voltages by comparison with a standard cell. This one would have been used mainly to measure the small voltages produced by thermocouples for temperature measurement. |
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2544 - Function Generator PM5168 Philips, Holland Frequency range: 0.0005 Hz to 5000 Hz it can generate sine, square, and sawtooth waves of variable amplitude and DC offset, and also single pulses. |
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2545 - Carriers with Knife Edge unknown, |
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2546 - Public Address System Amplifier Acoustic Technologies, Brisbane, Australia Two channel transistor power audio amplifier input: 2V RMS for rated output output: 250W in 8 ohms 350W in 4 ohms |
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1484 - Box of Electronic Instrument Manuals various, |
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Hopkins/ Storz , Germany Endoscopes are used in medicine and engineering to make internal visual observations. This type has a rigid tube with periscopic optics and was the forerunner of modern flexible fibre-optic devices. A light source can be attached at the socket on... |
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'Foreign', Other (post WW2) Used to determine the route distance between two points on a map. A small wheel at the base turns as the instrument is run over a path on the map, and the dial indicates the total distance. Several scales are provided for different map scales. |
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ZHFU, China (2020) Used to monitor the frequency of mains voltage. 380VAC rating. D'Arsonval movement indicates frequency on a scale reading from 45 to 65 Hz divided in 0.5 Hz intervals. |
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2546 - Public Address Amplifier M250 Acoustic Technologies, Brisbane, Australia (c. 1990) Locally made rack-mounted high power audio amplifier. Two channels, each 250 W in 8 ohm load and 350 W in 4 ohm. It is based on a complementary symmetry output circuit using 2SJ49 and 2SK134 transistors. |
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Huggins Labs, Inc., Sunnyvale, California, Usa Amplifier of UHF signals in the 1 GHz region, such as satellite communications. The input signal travels along a wire helix in an axial magnetic field. An electron stream travels the length of the tube coaxially with the helix. The voltage... |
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Master Instruments Pty Ltd, Sydney, Australia Australia-made AC and DC meter. |
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2549 - Wire-wound Potentiometer 100R UQ Physics Workshop, Australia (before 1950) An open wire-wound potentiometer of 100 ohm total resistance mounted on Paxolin board and wooden stand. Probably used in undergraduate laboratories. |
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2550 - Wire-wound Potentiometer 50K UQ Physics Workshop, Australia Potentiometer for use in undergraduate teaching laboratories. |
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2551 - Magnetic Hysterisis Apparatus UQ Physics Electronic Workshop, This apparatus is designed to determine a B/H curve for a transformer and to teach students to use an oscilloscope. A small transformer inside the box has a primary 240 V winding and a 50 V secondary winding. The primary current is sensed by... |
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2553 - Precision Wire-wound Potentiometer W.G. PYE & Co, CAMBRIDGE, England |
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2554 - Wavemeter Type 566-A HF/VHF General Radio Co, Usa Used to measure the wavelength ( actually the frequency) of a radio transmitter in the range 0.5 Mc/s - 150 Mc/s . Resonance of a capacitor/ inductor circuit is detected by an incandescent lamp with a very fine hairpin filament as the capacitace is... |
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2554 - Rotary Transformer (Generator) A.P.No 2 Airzone (1931) Ltd, Sydney, Australia (1942) Essentially a DC motor and generator sharing a common shaft and static magnetic field. Input 11V, 3.2 A Output 354 V, 0.04 A The conversion efficiency was about 40 %. Probably used to provide a high voltage supply fot the anodes of valves... |
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2555 - Transistor Inverter Type VB-32 AWA (A'sia) Ltd Sydney, Australia Designed to convert the 32 V DC of home lighting plants to 240 V AC for the operation of television receivers. Uses germanium transistors. |
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General Radio Co, Usa (1930s) Designed for measurement of the frequency of HF/VHF transmitters. Based on a resonant circuit with a variable 250 pF capacitor and one of a set of inductors. The resonance detector is an incadescent lamp with a fine hairpin... |
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Weston Electrical Instrument Corp, Newark, N.J., Usa (1938) Units such as these were used by repair technicians to test whether valves (vacuum tubes) were working to specification. Valves had only short operating lives compared with other components and plugged into sockets so that they could be swapped... |
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Bates, England Although similar in appearance to a Sikes' hydrometer used for determining the alcohol content of beverages, this instrument is meant tfor liquids with densities greater than that of water, for example, sugar solutions. In this case, the small... |
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2559 - Jaw Assembly for Indentation Hardness Tester unknown, Possibly used for Rockwell or Brinell hardness testing where the area of indentation made in a sample by a hardened steel ball under load can be measured using the eyepiece. |
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2560 - Megger Insulation Tester BM7 Evershed & Vignoles, England Used to measure very high resistance such as insulation by measuring the small current that flows when a fairly high voltage is applied. The instrument has three ranges: 1) Megohms with 500V applied 2) Ohms with 300 mV applied 3) Internal... |
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2561 - Sharp Pocket Computer PC-1500 Sharp Corporation, Japan (c. 1980) Pocket calculator programmable in BASIC with alphanumeric keyboard and single line LCD display. with cover sleeve. |
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Zeal, England Used to diagnose battery faults by measuring the density of the electrolyte. A sample is drawn up into the glass tube and a reading taken from the scale on the float. Covers specific gravity range 1100 to 1300 kg/m3 at 25 C. |
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2563 - Faber-Castell 1/54 Darmstadt Slide rule A.W. Faber-Castell, Stei bei Nuernberg, Germany (c. 1970) A popular engineering slide rule from one of the best-known makers. 'Darmstadt' refers to the technical college where the particular arrangement of scales was devised. It includes, on the back of the slide, so-called log-log scales used to raise... |
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unknown, A 5 cm diameter double concave glass lens. 20 cm focal length. |
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2566 - Rectangular Glass Blocks unknown, Two rectangular glass blocks, purpose unknown. Perhaps samples of plate glass. |
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Ragg, Parco, Musical scale tuning forks C 256 Hz, D 288 Hz, E 320 Hz (two) |
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2568 - Spring Test Calibration Samples unknown, Calibration samples for a beam bending test machine using three or four point loading. The machine is used to test steel for springs. A three-point test loads the beam centre. A four-point test loads the beam with two equal loads at two-thirds of... |
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Siemens , Germany An instrument to measure the strength of a magnetic field. 'Gauss' refers to the cgs unit of magnetic flux density (= 10-4 tesla) named after polymath Carl Friedrich Gauss (1777-1855). The 'Oe' on the dial refers to the cgs unit of magnetic field... |
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2570 - WHEATSTONE BRIDGE RESISTANCE BOX Griffin & George, England In 1833 Samuel Christie described a clever circuit for measuring resistances that was later popularised by Charles Wheatstone. It requires a number of accurately known resistances such as are provided in this unit, a battery and a sensitive... |
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Unilab, England Microwave detector from an RMIT undergraduate teaching lab experiment on electromagnetic wave propagation. |
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Electroradix London, England An early multimeter consisting of a d'Arsonval meter and a selection of resistances that can be connected to allow the meter to read volts, amps and ohms. |
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unknown, Mystery object from UQ Science Workshop. Perhaps a stepped pulley or a mandrel of some sort. In bespoke plywood box. Step diameters: 19, 21, 29, 35, 52, 61, 114 mm. |
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2574 - Random Noise Generator 1390-B General Radio Company Concord Mass., Usa Test instrument provides a random noise signal over audio, long wave and middle wave frequencies. A filamentary diode valve 6D4 in a magnetic field generates a noise signal that is amplified by two 6AQ5 stages. A 0.3A, 4V ballast maintains the 6D4... |
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2574 - Random Noise Generator 1390-B General Radio Company Concord Mass., Usa Test instrument provides a random noise signal over audio, long wave and middle wave frequencies. A filamentary diode valve 6D4 in a magnetic field generates a noise signal that is amplified by two 6AQ5 stages. A 0.3A, 4V ballast maintains the 6D4... |
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2575 - R-C Audio Oscillator Type A57150 Amalgamated Wireless (A'asia) Ltd Sydney, Australia (C. 1950) This is an Australian-made Wein Bridge oscillator covering the frequency range 20 Hz to 200 kHz in four ranges. Two twin-ganged variable capacitors are operated by the front panel knob to continuously vary the frequency while range-change resistors... |
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Advance Components Ltd, London, England (c. 1950) Used to measure the 'Q' or sharpness of response of a resonant circuit or filter. Q = (centre frequency)/bandwidth where the bandwidth is the frequency range between half power points (where amplitude is 0.707 of maximum ) It has six frequency... |
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unknown, A probe in the end of a tube is lowered by a thin steel hawser down a borehole. Probes may be designed to measure such parameters as pressure, temperature, electrical resistance or magnetic fields. If several holes are bored, measurements in the... |
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unknown, France (c. 1860?) Brass micrometer gauge, 0 - 30 mm. Possibly a variation on 0 - 30 mm French Palmer micrometer from 1867. In more recent wooden box. |
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