Siphon recorder, 1870

Glass tube, containing a chemically prepared example, for Ocean depth sounding machine

Case, cylindrical - with chain attached lid and funnel - for glass tubes, for Ocean depth-sounding machine, for marine vessel navigation

Boxwood fathom marker

Boxwood fathom marker

Galvanised iron canister

Hand-powered winch, for Ocean depth sounding machine, used for marine vessel navigation

Barrel magnet for siphon recorder, 1870

Paper dispenser for Siphon recorder, 1870

Siphon recorder, 1870

Galvanised cast iron sinker weight, for Ocean depth sounding machine, used for marine vessel navigation

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