A Surveyors Hanging Nail

A Surveyors Hanging Nail

A Surveyors Hanging Nail.
A Surveyors Hanging Nail. Size 1 1/2″ x 1/2″ inches.

A series of these nails were knocked into the roof timbers down the length of the roadway and  heavy objects were attached to the wires and dangled from them, surveyors would line them up to make sure the roadway was being driven in a straight line.

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