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174 - Triode Transmitting Valve 357A Weston Electrical Instrument Co., Usa FM/AM operation to 100MHz in broadcast transmitters. High transconductance and low capacitance allowed small grid bias in Class B operation. Similar to type 833A. |
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175 - Valve Transmitter QY5-500 Mullard, England This tetrode valve was used in an ionosonde pulse amplifier built by UQ Workshop. The pulse of RF was directed upwards to the ionosphere, to be reflected back below a frequency dependent on the ionospheric layers, and to be transmitted thru the... |
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177 - Proportional Divider, Staedtler Staedtler, |
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178 - Proportional Dividers, Uchida Uchida, |
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Linex, Denmark, |
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180 - Slide Rule with Addiator Adding Machine AW Faber, Germany On the front side, this appears to be a very ordinary general purpose slide rule from one of the major German manufacturers, using the brand name Castell. But turning it over reveals an Addiator manual adding machine, so that addition and... |
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181 - Slide Rule, Hemmi Electrical Engineering Hemmi, Japan Belonged to staff member Dr Jim Crouchley. |
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Unknown, Germany, Germany Slide rule used by Dr Jim Crouchley. |
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185 - Thermometer, Medical, Fahrenheit Unknown, Medical thermometer belonged to Dr Jim Crouchley. |
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unknown, Germany Toy compass in brass case with hinged cover. The needle can be locked to avoid damage when not in use. |
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Staedtler, Germany |
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Benson, Germany Belonged to Dr Jim Crouchley |
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Drawing aids used in preparation of publications by Dr Jim Crouchley. |
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Tektronix, Usa Circular slide rule to facilitate electronics calculations such as reactances and resonant frequencies. Used by Dr Jim Crouchley. |
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Pioneer, USA, Usa |
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200 - Kew Pattern Magnetometer Cambridge Scientific Instrument Company Ltd, Cambridge England 178, England Central housing with removable wooden sides for suspended magnet and rotatable on tripod base with three levelling screws. Top of base contains scaled horizontal circle, two reading microscopes and spirit level. Telescope arm and deflection scale... |
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Otto Wolff, Berlin, Germany (1914) Mahogany case has ebonite plate carrying heavy brass contacts and switches with ebonite handles. Inside the case are resistance coils, calibrated at 20C. Such potentiometers were used to measure voltages by comparison using a battery as energy... |
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Lee de Forest Laboratories, Los Angeles, California, Usa A black plastic board with the controls and meters for DC plate current and RF current on it. The electronic circuit is right behind the control board. The case of this device is missing. The circuit has two triode valves, two diode valves, a... |
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Solmon Marks and Co, Cardiff, Other Brass sextant with wooden handle and finely engraved silver scale. The mirrors and filters are present but the telescope is missing. Light from a celestial body such as the Sun or a star is reflected by a mirror attached to a moveable arm, through... |
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207 - Texas Instruments TI59 Programmable Pocket Calculator Texas Instruments, |
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209 - Sinclair Scientific Pocket Calculator Sinclair, |
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210 - Otis King's Patent Calculator Model K Carbic Ltd, London, England (circa 1935) The Otis King and Fuller slide rules are similar in appearance as both use a helical logarithmic scale. The larger Fuller’s Spiral Slide Rule is a total 33cm in length excluding the handle and boasts a 12.5 m long scale wrapped helically... |
| A planimeter was used to measure areas on maps or plans or graphs. The perimeter of the area of interest was traced around by the stylus on the tracer bar and the reading on the rolling drum was then scaled to provide the answer in appropriate... | |
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216 - 20 Inch 'Merchants' Slide Rule Keuffel & Esser Co., Usa (c. 1965) The invention of the slide rule is usually credited to William Oughtred in the 1620s. Previously, lines with numbers marked out logarithmically had been used with dividers to carry out multiplications, but having two scales sliding together was far... |
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The Calculator Corp., Grand Rapids, Mich. USA, |
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219 - Computer, Time Conversion US Air Force, Usa (WW2) Used by aircraft navigators to convert from civil to sidereal time when making celestial observations to fix the aircraft position. |
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Contex, Contex calculators were first introduced by Carlsen Brothers in Denmark in 1946 and the displayed half keyboard version would have been one of the first sold. The company exported to more than 100 companies, including Australia, with Sterling... |
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221 - Chamber's Seven-Figure Logarithms of Nos. up to 10000 James Pryde, FEIS (Ed.), |
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222 - Graphical and Mechanical Computation Joseph Lipka, PH.D., |
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223 - AWV Valve Replacement Slide Rule A.W.V., |
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225 - Marchant Electrical Calculating Machine Marchant, |
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226 - Original-Odhner Calculator Sweden (1960s?) Invented in 1873, this design of mechanical calculator was one of the most successful ever. It uses pinwheel discs rather than the bulkier Leibniz cylinders of the de Colmar Arithmometre, but otherwise is similar in operation. |
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Arithma, |
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1813 - Telegraph Lineman's Galvanometer Telegraph Works Silvertown London, England (circa 1910?) This form of galvanometer, also known as a ‘Q and I detector’, was used as the basic diagnostic tool by telegraph linemen. A horizontal axle carries an indicator in front of the dial and a magnetised needle inside, located between two coils.... |
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A normal slide rule is used to perform multiplications and divisions and find the value of functions like sine, cosine and tangent, reciprocal and exponential. Its invention goes back to the seventeenth century, but it was in the mid twentieth... |
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This mirror is a Searchlight mirror constructed during WWII. This concave spherical mirror would have been placed behind a very luminous source of light such as a carbon arc lamp to project a powerful beam of parallel rays. These searchlights were... |
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295 - Astrophone Crystal Radio Receiver Amplifiers Ltd, England, England (circa 1925?) Housed in a wooden box lined with blue fabric in the lid. On the facade, there are dials for the 'tuning' of the circuit to the desired station and two plugs by means of which extra capacitance may be added. Incoming modulated radio waves... |
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323 - Valve Fabrication Display Amalgamated Wireless Valve Co. Pty. Ltd. Sydney/Melbourne, Australia (circa 1950) White painted frame with glass cover houses board displaying main components and steps in manufacture of thermionic heptode valve 6BE6. Developed extensively in the 1930's, electron valves (commonly referred to as electron tubes in the USA)... |
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Mullard, England This valve is a tetrode and has an envelope made of Silica (Silicon Dioxide). The anode is woven. There are two connections at one end (anode and control grid), and four at the other end (filament, screen grid and blank). |
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231 - Radiation protection slide rule Prof. Dr A. Buhl , |
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232 - Isotope Handling Calculator MK II Abott Brown, Beaminster, England |
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Atomic Energy of Canada Ltd. , Canada |
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236 - AWV Valve replacement slide rule AWV, |
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Stanley , England |
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The first Curta calculator was designed and made by Curt Herzstark in Lichtenstein in 1948. Two types were made with a type 2 model (15 digit result counter) being displayed here. These calculators are capable of addition, subtraction,... |
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243 - Calculator, Rapidman 800 Rapid Data Systems & Equipment Ltd. , |
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Philips, |
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Western Electric, Usa Small low-powered cavity Magnetron. This has a diode structure, with several cavities in the anode, tuned for the Radar X-band. The spiralling electrons travelling from the central filament to the anode thru a transverse magnetic field (the magnet... |
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259 - Antenna changeover switch unknown, Used to protect a receiver when a transmitter is connected to the same antenna. |
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263 - Valve, transmitting, CV1501 England English transmitting triode probably pre- WWII. |
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20th Century Electronics , England Vapour-filled glass tube under low pressure, with a cathode wire running along the tube axis. The anode is a graphite coating on the inside of the tube. A voltage of 1300 Volts is applied across the tube. Particles, mainly high-speed electrons (beta... |
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Edison and Swan United Electric Co. , England (circa 1900) Coiled carbon filament (intact) housed in clear glass globe. 'Bayonet' cap consists of cylindrical brass collar and ceramic base through which platinum wires, insulated from brass and each other by vitrite, connect two ends of filament to power... |
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Radio Corporation of America , Usa |
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272 - Nixie numerical display tube B6560 Nixie, |
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Radio Corporation of America, Usa The nuvistor was the last of the thermionic receiver valves. The 6DS4 triode is constructed as a series of coaxial tubes. The control grid tube is punctuated with many fine holes, produced by photography and etching. The... |
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Philips, |
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278 - Photomultiplier tube 6292 Dumont, Usa |
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