Sullivan and Griffiths substandard wavemeter, type R209, 1947 Sullivan and Griffiths substandard wavemeter, type R209, 1947 1947
Wavemeter, Air Ministry type W1117 (10D/10220), c. 1939. This battery-operated set could detect frequencies between 125kc/s and 20mc/s, or 125kHz-20MHz. Air Ministry Wavemeter type W1117, c. 1939 1939
Wavemeter used on the first transatlantic television transmission, from Goonhilly in Cornwall. Wavemeter used on the first transatlantic television transmission
Short-wave sub-standard wavemeter, No. 835/32, made by H.W. Sullivan and Co., complete with 6 coils Short-wave sub-standard wavemeter
Absorption wavemeter, 10-23 Khz, Serial no.3060/1945, made in 1945, by H.W. Sullivan Ltd., London Absorption wavemeter 1945