Massey's patent, frictionless ocean depth sounder
1836
Detaching claws and sinker weight for depth sounding, made by Carmelo Bonnici
1857
Morse sounder, 900 ohms, GPO No. 19161
Sir William Thomson's Triple Depth Gauge, one of two, 1880
1880
Sounder - hollow lead cylinder with internal flaps
Telegraph sounder
Sounder using 9 micron piezo film
Post Office sounder
Neale's sounder
Ebel sounder with stylograph
Sporton's improved form of Graham Bell's original sounder
Piezoelectric Sounder: PVDF bimorph. Uses Kureha film
Edward Massey-patented sounding machine
direct reading polarised sounder and example of polarised polechanger
1920-1925
Original Neale sounder
Scoops from Bulldog sounder and sampler used during telegraph survey operations
1860
Jaws from Bulldog sounder and sampler used during telegraph survey operations
1860
"Sub Sig" echo sounder type 301/642 recorder
1954-1963
Vertical arm, scoop, lid and chain from Fitzgerald sounding machine
1867
Edward Massey-patented sounding machine
Vyle's direct reading polarised sounder
Neale sounder with tubes
Air-Compression type Depth Gauges, 1880
1880
Hydra weight-detaching sounder for collecting small samples from the sea bottom
1868
Skead's detaching-weight sounder used for telegraph survey operations
1857
Hand lead and deep sea sounding machine
Detaching-weight sounder, or ‘Brooke’s Rod’, designed by Ensign Brooke
1855-1860