Radio Frequency Bridge [Wayne Kerr Laboratories]

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1510 results. Displaying results 1 - 50.

Radio frequency bridge made by Wayne Kerr Laboratories in New Malden, Surrey England. Model B601, designed as a multi-ratio instrument for the measurement of resistance, capacitance and inductance over a wide range of values. Used by Dr JB Gregory from the University of Canterbury in his research at Scott Base (Antarctica) in the late 1950s to study the characteristics of the lower polar ionosphere (D Region) and to measure the height, strength and time of radio wave reflections originating at low heights in the ionosphere. Dr Gregory found that the emission of protons from solar flares was more frequent than previously known and contributed to the ionization in the polar atmosphere which resulted in radio blackouts that significantly impacted the use of high frequency radio-based technology in Antarctica.

Radio Frequency Bridge [Wayne Kerr Laboratories] <C> The Wayne Kerr Laboratories Limited

Navigational Computer 1939-1945

Drill, Contact Lens [Polymethyl metacrylate (PMMA)] Hirst Contact Lens Limited 1968

Vertometer Bausch and Lomb Optical Company Hirst Contact Lens Limited

The Robertson Semi-Automatic Lathe. This standard contact lens lathe was manufactured in the UK circa 1980. This type of lathe was extremely robust, cutting a good surface on the plastic to later be polished. This lathe employed a semi-automatic system which enabled the tail stock to cut a lens radius mechanically, preventing hand movement from being transferred onto the cut surface. The lathe is painted grey metal, composed of several parts. It has a large rectangular metal base. There is a control panel at the front with a line of coloured buttons. There is a clear circular power button on the left, then three rectangular buttons with identification labels above: “ON”, “OFF” and “MAIN SPINDLE”. Underneath these is printed in black “The Robertson Semi-Automatic”. To the right there are six coloured buttons labelled “FINE / COARSE / REPEAT / SET / DAM / AUX / STOP”. Then there is a red stop button and a red manual switch. There are eight labels of different sizes on the front panel of the machine. On the top of the main unit is a rectangular box with a spindle pointing towards the centre on the left. This is the headstock. It has a metal sign “IMPORTANT / DO NOT MOVE HEADSTOCK / WHILST SPINDLE IS / STATIONARY”. It has a black metal lever and a circular knob on the other end. In front of the headstock is a circular gauge, made by “MITOTOYO”, with a scale from 0 to 100 in increments of 10. Next to this is a metal sign which reads “WARNING / DO NOT OPERATE COLLET / LEVER WHILST SPINDLE IS ROTATING”. To the right of the spindle is a blue metal upright with an extended arm. There is a black eyepiece which is tilted diagonally. It has an adjustable knob on the right. This is to view the metal circular base below, which holds a metal platform where the contact lens is worked. To the right of the platform is a second gauge, made by “Baty” with a scale from 0 to 100. There is a semi-circular clear plastic ruler around the circular base at the front. On the top edge of the main unit at the top right are two metal signs which read “ADJUST CENTRE” “ADJUST FINE”. There are two metal knobs on either end of the main body of the machine. On the right, “No. 1” is written in permanent marker. The left side has a business card attached with tape, “ELECTRICAL EQUIPMENT CO/ LTD. […]”. At the back of the machine is the maker’s plate, “DESIGNED AND MANUFACTURED IN U.K. / BY / Robertson Engineering (Thame) Ltd. / SERIAL NO MK4 / 77629 00 / Voltage 240 RPM VAR”. The headstock also has a sign, Headstock label “HEADSTOCK BEARINGS / ARE GREASE LOADED/ NO / FURTHER LUBRICATION SHOULD BE REQUIRED”. There is a lamp which is connected to the back of the machine with a flexible brass-coloured neck. The lamp shade is white metal with a bulb. A cream coloured cord extends from the light fitting and goes inside the unit through a grate at the back. There are two large metal plates on the left and right of the machine. The one on left reads “SPINDLE FORWARD […]” and the right one reads “5 AMP 1 AMP MAIN SWITCH […]” with fuses and a key underneath. There is a grey power cord with 3-pronged plug attached at the bottom right. Parts 2-4 are held in a small plastic bag attached to main object. Part 2 - Email correspondence from Nexgen Optical Ltd. Part 3 - A small rectangular case holding 16 Allen keys and two semi-circular metal plates, one hand-engraved with "8.0" and one engraved with "8.1". Part 4 - A fuse with a black plastic knob on one end with the word "FUSE" repeated three times.

Lathe, Standard Contact Lens Robertson Engineering Limited 1980

A rectangular plastic box with a brown wood grain pattern. The plastic panels are held together with metal fastenings. On the front of the box are two metal switches and a circular white plastic dial with a black rectangular base. On the black rectangular section is white text, “T. UP Pw-ON / TYPE H3M x 1 Min.” On the white dial is a scale starting from 0 and ascending in increments of 0.5mm up to 3.0mm. There is a red needle and the word “OMRON” at the bottom. The machine has two levels. On the lower level is a removable black plastic tray with white Perspex on both ends. “179” is handwritten in pen on both sides. In the centre of the tray is an angled metal screw body which comes through from underneath. There is clear plastic around the hole. Above this is an adjustable metal arm with a needle attached to the end. This points towards the screw. Behind this is a white plastic protractor attached to the wall of the box. On the upper level is a lamp, attached to one corner with a flexible metal stem. The lamp has a white metal shade with a diamond pattern around the edge. The bulb is missing. There is an adjustable circular metal knob on the top level which controls the screw and the needle at the same time. On the right side of the object are six holes in the plastic panel. There are 12 holes in the plastic at the back of the box. There is a power cord attached to the bottom right corner. This polishing machine was made by Hirstlens engineers circa 1954. As polishing machines could not be purchased in New Zealand at the time, the engineers at the Hirstlens workshop designed their own using parts of obsolete gun sights from army surplus stores.

Machine, Optical Polishing Hirst Contact Lens Limited 1954

Vertometer. This instrument was made by Hirst around 1947 in conjunction with the Department of Scientific and Industrial Research (DSIR) to measure the Vertex power of the early Haptic lenses. Horizontal oblong object with an eyepiece at one end. This points to a black piece fitted with a metal wire mount, presumably where the contact lens was placed. The vertometer is supported in the centre by a black circular base. There are two horizontal rods of metal that span the object’s length – one is cylindrical and the other is rectangular. The outward face of the rectangular rod has a number scale. From the left, the numbers start at 10 and descend in increments of 1 to 0 in the centre. The numbers then ascend in increments of 1 up to 20. There are two black Bakelite rectangular pieces that can slide along the length of the item. These pieces hold metal cylinders with lenses. The rear cylinder has a power cord attached at the back, this is the light source for the instrument. The cord connects to a small wooden box with a round black plastic switch on one end. There is a piece of card attached to the lid, with writing handwritten in black. It reads “Vertometer / 1946 / built by D.S.I.R.” Inside the box is a battery terminal which operates the switch.

Vertometer, Haptic Hirst Contact Lens Limited Department of Scientific & Industrial Research 1946 1947

Con-o-coid Contact Lens trial set Hirst Contact Lens Limited David Volk Eugene Hirst 1966

Engraver, Contact Lens G. Nissel & Company Limited

Prototype PMMA contact lenses Hirst Contact Lens Limited 1968 1960

Grenade - German Stick

Sectioned Grenade - Composite

Grenade - Mills Bomb Type

Taxi Meter [Novel] Nishibe Keiki Manufacturing Company Limited Taximeter Services Limited

Box of Bullets

Tracer Bullet, 50 Calibre

Practice bomb Circa 1940

Replica Ammunition Shell. Silver coloured metal.

Ammunition Shell [Replica]

Hispano gun, 20mm, MK5 Original Vernon description: 4 from Vampire 4 from Mosquito 2 demonstration in boxes