Deep echo-sounder for measuring ocean depth, Type 773, with spare chart and paper, made by Kelvin-Hughes, 1960s.
Echo sounders, which timed the echo from a sound source, enabled the automation of measurements of the depth of the water below a ship. This model, made by the marine instrument manufacturer Kelvin Hughes, recorded onto paper.
Deep echo-sounder for measuring ocean depth, Type 773, made by Kelvin-Hughes, 1960s
Echo sounders, which timed the echo from a sound source, enabled the automation of measurements of the depth of the water below a ship. This model, made by the marine instrument manufacturer Kelvin Hughes, recorded onto paper.
Spare dry recording paper from deep echo-sounder for measuring ocean depth, Type 773, with spare chart and paper, made by Kelvin-Hughes, 1960s.
Echo sounders, which timed the echo from a sound source, enabled the automation of measurements of the depth of the water below a ship. This model, made by the marine instrument manufacturer Kelvin Hughes, recorded onto paper.
