 |
261 - Galena Crystals and Holder Unknown, Galena (Lead Sulphide) was the crystal of choice in crystal sets of the 1920s. It was used as a detector in connection with a catswhisker (a piece of brass or copper wire with a sharp point). The combination was the equivalent of a Schottky diode.... |
 |
Frank Stacey and Physics Workshop, Australia See item 146. |
|
Cox, |
|
|
Max Kohl AG, Chemnitz, |
|
 |
Unknown, (after 1920) Thermionic valve diode. Glass envelope, 4 pin crucifix bakelite base with sprung pins. There is no maker's name but there is a logo showing a windmill. |
 |
Philips, Other This triode valve was used in early radio receivers of the 1920s. It only has an amplification factor of 9. It was used both for RF and AF applications. |
 |
Mullard, England This triode was used in English radio receivers of the 1920s. It was designed for audio applications. |
 |
2050 - Tablegram wireless receiver and record player (11-25) Kriesler, Australia (1952) This Model 11-25 tablegram has a moulded bakelite case. It contains a dual-wave receiver (broadcast and one shortwave 6 to 18 Mcs bands). The inbuilt record player is a Collaro, designed to play 78 rpm records only, using... |
|
Thorlabs, USA, Usa (2015) In the most common sort of diode pumped solid state laser (DPSSL), an 808nm wavelength infrared GaAlAs laser diode pumps a neodymium-doped yttrium aluminium garnet (Nd:YAG) crystal which produces 1064nm wavelength laser light from the main... |
|
 |
291 - Microcomputer Memory Board PDP, Usa This board contains 32 only 4060 memory chips. This represented the Random Access Memory (RAM) for the PDP-11 computer in which it was installed. |
 |
2021 - Hearing Aid Model A-100 Acousticon, England This hearing aid is pocket size, and contains a three valve amplifier, a 1.5 Volt filament battery, and a B battery probably 22.5 Volts. It uses a magnetic earpiece suited to one ear only. |
|
2022 - Electronic Calculator & Watch Model ML-71 Casio, Japan Student calculator. An alarm rings the hour.Plays music using press buttons, 8 tone scale, with 11 tones available. |
|
|
2023 - Scientific Calculator Model fx-310 Casio, Japan Basic student calculator |
|
|
2024 - Ripple Control Receiver Zellweger (Aust) Pty Ltd, Australia This unit is used to control turn-on times for domestic hot water systems. It contains a frequency-sensitive relay. A 1050 Hz signal is sent down the AC mains to this unit to toggle the relay on and off. |
|
 |
2025 - Valve Triode Duo Diode 6BD7 Miniwatt, Australia This valve was used in domestic car radio receivers. The diode was used to detect AF from the previous IF stage. The triode was used as the first AF amplifier. |
 |
Miniwatt, Australia This valve was used in domestic radio receivers, Military transceivers and laboratory instruments. |
 |
Radiotron, Australia This valve was used to rectify high voltages generated by the line output stage of a B/W TV set. The DC was the supply for the picture tube (PIX) beam. |
 |
Brimar, England This valve was used in black and white TV receivers. It was the damper diode in the horizontal line and EHT circuit. |
 |
2029 - Valve Triode Pentode 6AW8A Unknown, This valve was used in black and white TV receivers. The pentode was used as a vertical output amplifier. The triode was used as a sync separator. |
 |
2030 - Valve Triode Pentode 6GW8 Miniwatt, Australia This valve was used in domestic audio amplifiers. The triode was used as a preamplifier or phase inverter/amplifier. The pentode was used as an audio output stage. Also used in black and white TV receivers. |
|
2031 - Valve Double Triode 12BH7 Miniwatt, Australia This valve was used in black and white TV receivers. It was used as the vertical oscillator stage. |
|
 |
2032 - Valve Double Triode 6CM7 Unknown, This valve was used in black and white TV receivers. It was used in the vertical oscillator stage. |
 |
2033 - Valve Triode Pentode 6U8 AWV Radiotron, Australia This valve was used in black and white TV receivers. It was used as a frequency converter in the IF strip. The triode was used as the oscillator and the pentode as the mixer. |
 |
2037 - Valve Triode Pentode 6AE8/X79 AWV Radiotron, Australia This valve was used in domestic radio receivers, as a mixer/converter. The triode was used as an oscillator. The pentode was used as a mixer. |
|
2038 - Parallel Computer Printer Plug Amphenol, This plug was used to connect printers to mini computers in 1960s |
|
 |
Unknown, Australia Components mounted on this board include a potentiometer, a two stage amplifier using transistors 2N4250 and 2N4033, resistors 270 Ohms and 4700 Ohms, two capacitors 0.1 uFd, and one LED. Function of this lashup is unknown. The veroboard has copper... |
 |
2041 - Voltage Regulator Board Texas Instruments, Usa This printed circuit board (PCB) contains a number of voltage regulating circuits. The pass amplifiers contain transistors TI7521, and the voltage reference diodes are 1N4383. |
 |
2042 - Chopper Board, Six Amplifier Stages Unknown, Usa There are six multistage amplifiers on this board, with chopper stages at the input end.. When measuring small DC voltages, it is easier to chop them into square wave segments, present the segments as AC signals to an amplifier, and rectify... |
 |
Unknown, This valve was used in black and white TV receivers, as the audio output stage. |
|
Unknown, England A couple consisting of two dissimilar conductors is heated by a coil of resistance wire. The wire and coupled are isolated electrically, but coupled thermally. The heated couple produces a voltage, dependant on the conductors used and the... |
|
 |
Central Iron & Steel Research Institute, China A model of a magnetic compass from the Han Dynasty, one of the 'Four Great Inventions in China'. It is based on the works of 'Hanfucious' (280-233 BCE) and Wang Ch'ung (27-97 CE). A magnetised iron spoon (originally ground from naturally... |
 |
Unknown, China (1990s) A central pivoted needle is surrounded by circles of azimuth et al and Yin/Yang symbol. Used by practitioners of geomancy (Feng Shui) |
|
Unknown, China Small pivoted compass in the centre. The outer circle has zodiac symbols, the inner circle has 24 azimuthal points. The finish appears to be lacquered plastic. |
|
 |
2054 - Counting Tube Dekatron E1T Philips, A screen on the side of the tube has numerals marked 0 to 9. An electron beam within the tube is deflected to illuminate a vertical fluorescent stripe next to the relevant numeral. A series of these tubes were used in a laboratory counter to... |
 |
Mazda, England An arc is initiated in the slim straight tube. The enclosed gas and Mercury vapour is under pressure greater than atmospheric when working. The combination of operating pressure and temperature generates a very intense arc, which... |
 |
2056 - Tube Photoelectric 1P39 RCA, Usa This is a standard photoelectric tube, with a semicircular cathode and post anode. Light striking the cathode releases electrons, which are attracted to the anode, and create a current flow proportional to the light intensity at the... |
 |
Mullard, England This is a neon discharge tube, with a series of cathodes, one for each numeral, and a plate anode with punched out numerals. The gas discharge goes from the selected cathode to the corresponding numeral, illuminating it. The relevant cathode is... |
 |
Philips, Other The tube contains a series of cathodes attached to the base pins in a neon atmosphere. The cathode is a flat plate with punched out numerals. The relevant cathode is selected by an electronic counting and logic circuit. A discharge goes to the... |
 |
Philips, Holland This projector lamp runs on 240V AC. The filament is in a rectangular pattern, supported between metal rods and glass rods. |
 |
Atlas, England This lamp was used in a domestic film projector. Being 100 Volts AC rating, the relevant projector was most likely Japanese manufacture. There are eight parallel filaments in two lots of 4 offset from each other. The cap is coated in a dull... |
 |
General Electric, Usa Carbon filaments are relatively fragile with a shorter life than Tungsten filaments. The carbon filament here is a double loop with as large radius of curvature as possible. This reduces any torsional tension created in manufacture. The... |
|
2039 - DC-37P Computer Plug & Shroud CEA/Cannon, Usa This plug was used in early personal computers as a parallel data port connector, typically for a printer. |
|
 |
2071 - Rietz-Scolaria Demonstration Slide Rule Staedtler, Germany (1960s) Prior to the birth of the electronic calculator in the 1970s, slide rules were the most commonly used aid to scientific and engineering calculations. As can be seen by the cover page of an old UQ exam paper they were used during physics and other... |
 |
2062 - Curta Type II calculator Contina Ltd Mauren, Leichtenstein., Curta hand calculator used in the Chemistry Department. Serial Number 519573 See Item 242 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... |
 |
unknown, China Considered one of the first mathematical instruments, the abacus has evolved significantly and so have the ways to use them. This Chinese Abacus also known as a Suan Pan has a 5+2 bead combination, with 5 earth beads and 2 heaven beads on a single... |
 |
2072 - Circular Slide Rule No. 28 Concise, Japan, Inexpensive plastic circular slide rule. Circular slide rules date back to William Oughtred in the 1620s, but were less common than linear ones in the twentieth century. They have the advantage that one does not 'run off the end of the scale' but... |
 |
2065 - Scholar slide rule Nr. 0903 Aristo, Germany, Basic plastic slide rule for secondary school use. |
 |
2064 - Geometrical and Military Compass of Galileo (replica) Museo di Storia della Scienza, Firenze, Italy The inventor of this piece of mathematical equipment was Galileo Galilei. Created between the years of 1595 and 1599 with a handbook for operation, Le operazioni del compasso geometrico e militare, appearing in 1606, the device was meant... |
 |
various, Tables of mathematical functions go back to antiquity. The first recorded mathematical table book was the Logarithmorum Chilias Prima published by Henry Briggs and John Napier in 1617. It included the first 1000 logarithms accurate... |
 |
Willard Storage Battery Co., Cleveland, Ohio, USA, Usa (circa 1927) The Willard Colloidal Rectifier has two electrodes, one aluminium and the other probably lead, immersed in a solution of ammonium phosphate with other chemicals to optimise the process (see patent). This one has never been used so that a sample of... |
 |
283 - Planar stack memory board Ampex Computer Products Division, Board carrying magnetic (ferrite) core memory. G616C Planar Stack. Marked Digital Equipment Corporation may be the following: 'core memory 4K 16-bit words, from original PDP11 bought 1972 used at Bribie Island with phase ionosonde.' |
 |
|
 |
2066 - Expanse B wireless valve Amalgamated Wireless Australia, Australia (circa 1920) A very early wireless valve made in Australia. Note that the padding material in the box is wool. It is a triode, with twin tungsten filaments, and coaxial elements. It is a so-called 'soft' valve, referring to the soft vacuum inside. Secondary... |
 |
Telegraphie Militaire, France (circa 1916) First World War era triode valve used in military radio receivers. The valve has a spherical glass envelope and a 4-pin crucifix base with birfurcated brass pins. The base has a lacquered brass skirt. The electrodes have a horizontal coaxial... |
 |
- Prouds Electric Clocks and Scientific Instruments - archive Anthony Roberts and Norman Heckenberg, This page provides links to information gathered on the activities and products of Prouds Electric Clocks and Scientific Instruments. Much of it was collected by the late Lawrence Tapprell and kindly passed on to us by his family. The firm operated... |
 |
Prouds Ltd., Electric Clock and Scientific Instrument Makers, 336 Kent St, Sydney, Australia (circa 1913) A recording barometer designed by Thomas John Murday and built by Prouds Electric Clocks and Scientific Instruments in Sydney in the first quarter of the twentieth century. The movement of an aneroid capsule is greatly magnified by a system of... |
 |
2069 - Photomultiplier Tube L50B01-H S.R.C. Laboratories Inc., Usa Removed from a Gamma ray Spectrometer. The flat end of the tube would have been in contact with a gamma ray detector eg a block of Thallium-activated Sodium Iodide. The gamma ray produces a flash of light in the crystal, the intensity being... |
 |
1438 - Quadrupole Mass Spectrometer Tube Centronic, England This tube is the vacuum head of a quadrupole mass spectrometer system produced in the 1980s for residual gas analysis. In principle it allowed the operator to determine whether the gas still in a vacuum system was air from a leak or water or... |
 |
W&G, Australia This is a drawing instrument. It allows scaling of drawn dimensions by selecting the relevant scale on the rule. White and Gillespie was a Melbourne firm making draughting instruments, slide rules, and gramophone records. |
 |
Sharp Corporation, Osaka, Japan, Japan (1996) The first semiconductor diode laser was demonstrated in 1962 but continuous wave operation at room temperature was not achieved until 1970, earning Zhores Alferov and Herbert Kroemer the 2000 Nobel Prize in Physics. In a diode laser, emisson of... |
 |
unknown, England (first quarter of twentieth century) This is a good quality clock movement, almost certainly English, probably dating from the first quarter of the twentieth century. It has very heavy brass plates and wheels, high-count machined pinions, and a fusee, all signs of quality. The... |
 |
1867 - High Impedance Earphones Trimm Inc, Usa (c. 1930) Each earpiece contains a dual pole permanent magnet assembly. The poles are wound with many turns of insulated wire less than 2/1000 inch diameter. A thin circular steel diaphragm is supported around its rim by the earpiece, with a very small gap... |
 |
Unknown, This unit allows for drawing very large radii or distances. It has a wooden arm marked in inches, with one fixed clamp and a second moveable one. Each clamp can hold a point or a pencil or pen. |
|
2052 - Leybold 555 80 Baur 1 Thyratron Germany This is a triode mercury vapour tube. Plate current is drawn when a positive voltage is applied to the grid. The grid then has no further control as ionisation of the mercury vapour maintains the, potentially rather high, current. Control is... |
|
 |
A. L. Franklin, Brookvale, NSW, Australia A parallel rule is used in draughting to draw parallel lines, also in navigation to plot course directions. This one has the logo of Sydney instrument maker A.L. Franklin. |
 |
2081 - Portable Valve Radio Receiver HMV, Australia (c. 1955) Battery powered superheterodyne domestic receiver. Uses 1.5V for filaments(all in parallel) and 90V for high tension. The valve line-up is: converter 1R5, IF 1T4, detector audio 1S5, AF out 3S4. Consumption HT 22 mA, filaments 250 mA. The... |
 |
2080 - Portable Valve Radio Receiver Model MM Astor, Australia (c. 1955) Superheterodyne domestic receiver.Runs on batteries or from 240 VAC mains. HT 67.5 V, filaments 7.5V. The filaments are in series with the AF output valve at the positive end of the filament string. Its filament is about 7 above earth,so... |
 |
Philips, Holland A gas discharge is set up between two metal cups in a glass cylinder with a Medium Edison Screw base with a single contact. The ultraviolet light produced kills germs. |
 |
unknown, A glass tube with cylindrical electrodes, containing helium gas. Probably used for spectroscopy. |
 |
Glass tube between glass spheres with rod electrodes. |
- ‹ previous
- 27 of 36
- next ›
