Sounding machine, Edward Massey, 1810 sounding lead Counting for a deadplood. A logvin has been applied to a brass plate, which drives a counter with a screw without end. This indicates Vadems on one side, to the other dozens of Vadems. When collecting the lead, the logvin is blocked by a circular blocking device; Because of this it was not necessary to know the moment that the lead hit the bottom. London brass (alloy)

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