Short Wave Tuner & Amplifier No. 17, by Robert W. Paul, London, c. 1915

Short Wave Tuner & Amplifier No. 17, made by London-based scientific instrument maker Robert W. Paul. With valve socket, provision for carborundum and Perikon detectors, detector switch (carborundum, valve, perikon), buzzer (with lock key), potentiometer dial, circuit inductance dial (scale 1-5), aerial tuner inductance (scale 1-19), reactance dial, aerial condenser valve 60W (scale 0-180), closed circuit condenser crystal 4000W (scale 0-180), change-over switch (tune, stand by), coupling arm (scale loose-tight), battery switch, and ten copper alloy terminals. Dials and knobs made of Bakelite(?). Copper alloy terminals include those for aerial, earth, H.T., L.T., TEL.1 and TEL.2. With ebonite surface in mahogany case with lid. This instrument can be dated to WWI.