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
CID current meter (not in working order) by CID Ltd
1984
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
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