Telefunken wavemeter, 1908
1908
Sullivan heterodyne wavemeter model K5, No. 21 1922
1922
Heterodyne wavemeter, made by Burndept Ltd, c.1923
1923
Wavemeter, wireless telegraphy, German No. 469
Wavemeter C
H.W.Sullivan wavemeter s/n 1565/1939
H W Sullivan absorption wavemeter, s/n 1274, 1936
Telefunken wavemeter PQK2
Wavemeter, type TF975
1954-1969
Japanese absorption wavemeter
McLachlan-Sullivan modulated C.W. wavemeter
Forward spark 'B' wavemeter 80 meters, 1914-1918
1914-1918
Siemens wavemeter
German crystal wavemeter type PQK 1 s/n 15651/1939
General radio wavemeter, type 758A, 1942
1942
Air Ministry Wavemeter type W1117, c. 1939
1939
Wavemeter used on the first transatlantic television transmission
Sullivan and Griffiths substandard wavemeter, type R209, 1947
1947
German wavemeter
Telefunken wavemeter PQK3
Short-wave sub-standard wavemeter
Absorption wavemeter
1945