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2338 - Tungsten Halogen Incandescent Bulb Mirabella, China The outer glass envelope contains a smaller quartz envelope, with a Tungsten filament inside. The quartz envelope also contains Iodine vapour. The Iodine reacts with Tungsten that evaporates and deposits the Tungsten back on the filament. The... |
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2364 - KS/9 Signal Strengthening Unit Kingsley Radio Company, Australia This unit is an RF preamplifier, using a 6AK5 valve. It was created after WWII to generate interest in and sales of equipment for the 28Mcs and 54Mcs bands. This unit has the 28Mcs plugin coil assembly, containing coils for input and output... |
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A J William Electrical Instruments Melb, Australia This unit can either be Connected in series with a cable carrying AC, using an inbuilt transformer with a number of taps on the primary winding, or A cable carrying AC can be passed thru the hole in the unit. This provides an alternative primary... |
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E. Esdaile, Sydney, Australia (1920s?) Parallel or Rolling Rules were used in draughting to draw parallel lines and in navigation to mark bearings on a map. The heavy lacquered brass ruler has two wheels connected by a long axle that allow it to be rolled to a new position while its... |
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unknown, |
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Ilford, England Although x rays will directly expose photographic film, the sensitivity can be greatly increased by placing the film in contact with a sheet of fluorescent material that will generate multiple visible light photons when struck with a single x ray. |
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2374 - Bombsight Optical Platform Norden, Usa The bomb aimer viewed through the optics (eyepiece absent) to pick out the target and try to keep the target in a fixed position on the cross hairs. The optics were connected to a gyroscope mounted in gimbals, which kept the optics level when the... |
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The Record Electrical Co Ltd, Manchester UK, Used by the now defunct Post Master General's Department of Australia. |
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Philips, Holland This valve is used in FM radio receivers. It combines the functions of FM limiter, FM detection, and AF amplification. It contains seven grids. Grids 2, 4, 6 are screens, and grid 7 is the suppressor. An FM signal is fed to grids 3 and 5.... |
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2368 - Bombsight Platform Stabiliser Norden, Usa This is a gyroscope mounted in gimbals, which stabilises the bombsight used by the bomb aimer. It has a large flywheel inside an Aluminium housing, spun by a universal 24V DC motor. It is connected by a rod to the bombsight. |
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2372 - Constant Voltage Transformer Advance Components Ltd, Walthamstowe London E17, England This transformer is designed to give a constant 230V AC at 50 Hz, for an input variation of 190V to 260V AC. The transformer combines a magnetic shunt and ferroresonant circuit to maintain voltage and sinusoidal waveform. |
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2376 - Norden Bombsight Optical Platform Gyroscope Norden, Usa The Aluminium housing splits in two to reveal the steel flywheel , which is driven by a universal 24V DC motor. The flywheel and motor armature were balanced individually, before assembly. Holes were drilled in the armature steel laminations where... |
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2381 - Halley's Comet Commemorative Plate Wedgwood of Etruria and Barlaston, England (1985) Decorative ceramic plate made to commemorate the return of Halley's comet in 1985-86. It depicts (clockwise from top) 1) Diagram of the interception of Halley's Comet by the Giotto spacecraft. 2) Detail from Giotto's Adoration of the Magi showing... |
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2370 - Illuminated Eyepiece X7 Ramsden PTI, |
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2378 - Box of Scale Balance Weights F. Satorius, Germany |
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Almagamated Wireless Ltd Sydney, Australia Capacitance substitution box when testing equipment, or a given resistor value in laboratory experiments. |
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Various, A quartz crystal ground to a thin plate is equivalent to an oscillating circuit with a very high Q factor (of the order of thousands). It is used with an amplifier, which supplies positive feedback, from its output, to the crystal in... |
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Pye, RCA, Hatcher Fisk Mfg, These crystals consist of a ground plate of quartz in an enclosure. The plates having plating on both sides or a metal plate pressed against both sides. The crystal is designed to generate a rock steady frequency in an oscillator circuit. The... |
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Unknown, This appears to be a gas discharge tube designed for photoflash applications. It would be connected to a capacitor charged to about 400V DC, which is discharged by a trigger wire wrapped around the tube. The brief brilliant flash is due to... |
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Unknown, The bird pivots on glass tubes. Water on the absorbent beak evaporates, cooling the beak. The red liquid in the body is drawn up because of the partial vacuum caused by the cooling. The Centre of Gravity (CG), initially below the pivot axis, moves... |
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- Illustrated Catalogue and Price List of Electrical Apparatus The Economic Electric Co., Twickenham, London, S.W., England Tenth Edition, circa 1905? Mail order catalogue for all sorts of electrical equipment including bells, telephones, motors, generators, xray, wireless telegraphy, batteries, lamps, medical devices, and electroplating equipment. A few sample pages... |
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1310 - Measuring Machine M1616 UQ Mechanical Engineering Dept, |
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Simplex, |
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| With case 1713/3 and stand and clockwork 1713/2 Plate holder missing | |
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This glass trough is similar to those used for lead-acid accumulators. used in demonstrations in optics lectures. |
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2385 - Zellweger Ripple Control Receiver Zellweger, This was used to remotely switch on and off a domestic hot water system (HWS), particularly during peak electricity consumption periods. |
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2387 - Portable Illumination Meter GEC, |
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Pasco Scientific, Usa |
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Mullard, England P-N-P output transistor, usually two used in push-pull to provide audio output of 250 milliWatts, using a 9 Volt battery source. |
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The Williamson Elec & Eng Co Ltd, Australia |
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Acousticon, England |
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2392 - Pentode Valve 5654/6AK5 Philips, England This is a VHF pentode used in military communication receivers and then later by Amateur Radio Operators. |
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2393 - Power Pentode Valve UL41 Philips, Holland This valve was used in transformerless domestic radios as the audio output stage, driving a loudspeaker. The filament was connected in series with other valve filaments drawing the same current. The supply voltage was higher than the combined... |
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2394 - Double Triode Valve E90CC Philips, Holland This double triode is a Special Quality valve. It was designed for long life (typically 10,000 Hrs and/or 70 percent of new specs), reliability and with close tolerances. It was used in valve computers, probably as a long-tailed pair (cathodes... |
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2395 - Thyratron Valve RZC1031 L M Ericsson, Sweden This valve is a cold cathode thyratron. |
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2396 - Double Tetrode Valve 832A & Socket Westinghouse, Canada This is a transmitting valve, using two halves in push-pull, at VHF frequencies. WWII military applications. |
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Precise Elec and Inst Co, Australia |
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Unk, This discharge lamp operates off 240V AC thru a ballast. The dark envelope suppresses most visible light generated, and allows emission of UV light. |
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Unk, |
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A J William, Australia |
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Pickett & Eckel Inc, Usa |
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Griffin, England The double metal hook holds in suspension either a compass needle or a magnet. The suspension filament resists the turning torque, when the suspended magnet tries to align with a local magnetic field. The angle of twist gives a measure of the... |
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2403 - Double Triode Valve E92CC Philips, Holland This Special Quality (SQ) valve was probably used in a long-tail pair or flip-flop configuration in an analogue computer. SQ valves were made to have a variety of specifications: Long life, typically 10,000 hours Reliability No cathode interface... |
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John J Griffin, England These were used to demonstrate that the Earth's atmosphere exerted a force on surrounding objects. The hemispheres were held together, and air exhausted from the interior. As the atmosphere exerts about 15lb/sq in force or 100kPa pressure, it... |
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Western Electric, Usa A triode used in voice frequency and carrier frequency amplification, and repeater equipment. Triodes were used as they contributed low noise, compared with other valves. This triode had a low amplification factor (2.3 - 2.6), but could deliver... |
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W & T Avery, England Weighs to 10 lbs avoirdupoids by ounces. |
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Griffin & Tatlock Ltd, England |
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2408 - Transmitting Valve Triode JAN-C1M-15E Eimac, Usa |
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2409 - Transmitting Valve Triode 717A/VT269 Western Electric, |
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2410 - UHF Amplifier Valve 6280/416B Unity Electronics, Usa This valve has planar electrodes separated by tens of microns. This reduces the transit path of electrons between cathode and anode. Thus this valve can be used at frequencies up to 3GHz, usually in a cathode driven (Grounded grid) configuration.... |
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C. I. Co Ltd., This electrometer is a version of the quadrant electrometer. Parallel vertical plates, separated by 6mm, are used as quadrants, with a silvered glass fibre pointer mounted on a horizontal taut quartz suspension, so it rotates about a horizontal axis... |
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2412 - Sub Standard Coil 100k Ohms R W Paul, England |
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Unknown, |
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Eimac, Usa This is an ionisation gauge used to determine the pressure in an evacuated vessel. It is a modified transmitting valve type 35T, with a thoriated tungsten filament. |
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2415 - Box of Incandescent Lamps Philips, Royal Ediswan, England |
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UQ Physics Workshops, Australia A hybrid coil (or bridge transformer, or sometimes hybrid) is a transformer that has three windings, and which is designed to be configured as a circuit having four ports that are conjugate in pairs... |
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Gossen, W Germany, Germany Meters used with thermocouples were d'Arsonval movements, with a low resistance moving coil, and a fine hairspring, so that sensitivity was typically one or two milliAmps FSD. They were commonly used with couples to measure temperature remotely, or... |
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Geophysics Australia, Australia |
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2419 - Twin Knife Switches, 2 Pole 2 Position Unknown, |
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2420 - LV Lamp in Small Bayonet Socket J J Hoelle & Co, Sydney, Australia |
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Smiths Clocks and Watches Ltd, England Multipole synchronous motor, operating on 240V AC 50 Hertz. An internal gearbox drives concentric shafts for minute and hour hands. |
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2422 - Potentiometer & Flexible Shaft Clarostat Mfg Co Inc, Brooklyn NY, Usa |
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Various, |
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2423 - Two pin Electrical Plug GMG, UK?, England |
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2425 - Double Adaptor Mains Plug Garnite, Note that the Active and Neutral are reversed on one side of this adaptor. It is now illegal to use such an adaptor, as it is unsafe. |
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2426 - Drive with Slipping Clutch Unknown, The gear wheel is connected to a helical spring wrapped around the shaft. When the shaft rotates in one direction, the helix unwinds and the gear is not rotated. When the shaft rotates in the opposite direction, the helix winds up and grips the... |
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Unknown, Germany?, Germany |
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2428 - Neutron Target and Detector? EA, England |
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Unknown, X-ray tube anode with burn mark used in lectures to medical students |
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Unknown, |
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Various incl Pyrex, |
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2432 - Map-Measure with Magnetic Needle Sakurai, Tokyo, Japan |
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Unknown, |
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