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