


"Sub Sig" echo sounder type 301/642 recorder
1954-1963

Original Neale sounder

Piezoelectric Sounder: PVDF bimorph. Uses Kureha film

Massey's patent, frictionless ocean depth sounder
1836

Neale sounder with tubes

Telegraph sounder

direct reading polarised sounder and example of polarised polechanger
1920-1925

Neale's sounder

Sounder using 9 micron piezo film

Ebel sounder with stylograph

Morse sounder, 900 ohms, GPO No. 19161

Post Office sounder

Sporton's improved form of Graham Bell's original sounder

Sir William Thomson's Triple Depth Gauge, one of two, 1880
1880

Detaching claws and sinker weight for depth sounding, made by Carmelo Bonnici
1857
Skead's detaching-weight sounder used for telegraph survey operations
1857
Detaching-weight sounder, or ‘Brooke’s Rod’, designed by Ensign Brooke
1855-1860
Hydra weight-detaching sounder for collecting small samples from the sea bottom
1868
Vyle's direct reading polarised sounder
Hand lead and deep sea sounding machine
Air-Compression type Depth Gauges, 1880
1880