Watts helix current meter in box with accessories by Hilger & Watts Ltd
1948-1960
Current meter Mk V by Ott
1980-1990
Impeller current meter marked Neyrpic
1960-1970
High speed impeller current meter
1960-1970
Helix current meter by Hilger & Watts Ltd
1960-1965
Valeport current meter
1970-1979
Watts Mk IV 'acoustic' current meter
1958
Nile control vertical axis current meter
1965
CID current meter (not in working order) by CID Ltd
1984
Current flow meter
1850
Delft current meter with gimbal arrangement
1980-1985
Roberts radio current meter no 117 by Kelvin and Hughes
1970-1975
Recording directional current meter
1950-1960