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My father was clearing out some drawers and came across what appears to be a Sonar Timer stopwatch.
Anyone know much about them and any ideas as to potential value ?
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maseman
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Used to set timers on depth charges.Using sonar ping/sound travel through water measuring with the stopwatch as an indicator of depth of U-boat.Worth approx £50.There is a bit of info out there if you Google.Notice you don't have any military markings on the back though
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Last edited by amcneill; 2nd April 2019 at 03:40.
I think it was the distance of the U-Boat from the ship rather than the depth, as U-Boats only submerged to depths of up to a couple of hundred metres.
A nice thing to see.
I can’t answer your questions, but it’s very interesting and I appreciate you sharing the photographs.
Don't just do something, sit there. - TNH
I know nothing about this - other than its very interesting; thanks for posting
Yep, sonar. The speed of sound in water is about 1640 yards per second, which is why 1600 is opposite 2 seconds - the time for the sound to get there and back.
These are often known as ASDIC stopwatches - Allied Submarine Detection Investigation Committee.
Last edited by SimonK; 6th April 2019 at 17:51.