"Hecta" portable electronic Echo Sounder, consisting of:- 1) Instrument case with switches and dial, 2) Remote dial, 3) and 4) two transducers, and 5) and 6) brass fittings, from the Gipsy Moth IV, sailed around the world by Sir Francis Chichester between September 1966 and May 1967, by Brookes and Gatehouse Limited, England, 1965-1966
The 'Hecta' instrument case with dials used to measure depth in hermetically sealed case, powered by mercury cells, on teak bracket, by Brookes and Gatehouse Limited, England, 1965-1966
Gravity switch with one lead for Hecta echo-sounder, by Brookes and Gatehouse Limited, England, 1965-1966
Transducer used to transmit ulra-sonic pulses, with rubber-insulated lead, by Brookes and Gatehouse Limited, England, 1965-1966
Transducer used to transmit ulra-sonic pulses, with rubber-insulated lead, by Brookes and Gatehouse Limited, England, 1965-1966
Brass fittings allowing transducer to be fitted to the hull, by Brookes and Gatehouse Limited, England, 1965-1966
Brass fittings allowing transducer to be fitted to the hull, by Brookes and Gatehouse Limited, England, 1965-1966
