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