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Marconi Crystal Receiver With Valve, by Marconi Company, London, c. 1916
Inventory Number: 99012
Date: c. 1916
Maker Details: Signed by Marconi's Wireless Telegraph Co. Ltd.
Inscription: "MARCONI'S WIRELESS / TELEGRAPH CO. LTD. / NO. 115806 LONDON" on ebonite surface (under later knob). "MARCONI'S WIRELESS / TELEGRAPH CO. LTD. / .01 CAPACITY / PATENT NO 15909/08" on capicitance dial.
Size: 305 x 270 x 130 mm (height excluding knobs and dials)
Materials: Ebonite, teak, bakelite, brass, steel?, copper.
Other Given Number(s): Christie's 50.
Notes:
Marconi Crystal Receiver With Valve, based on a Marconi Crystal Receiver Type 16, with one crystal detector replaced by a four-pin valve-holder. With potentiometer knobs and battery terminals marked 'Crystal' and 'Valve', additional copper switch on side and later knob on top. With bakelite capicitance dial (scale 0-10,SHORT), Inner & Outer Sheath copper terminals, brass telephone terminals, Jigger Switch knob, and Intensifier knob (scale -80,0,80), and nine brass terminals, upon ebonite surface on teak case. This example appears to have been a factory made receiver using a Type 16 chassis, although the usual Aerial Tuning Inductance was never fitted; the company name and serial number (115806) took its place, now partially obscured by the later, unmarked rotating knob.
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