Collection plummet or plump-bob
A plumb-bob or a plummet is a weight, usually with a pointed tip on the bottom, that is suspended from a string and used as a vertical reference line, or plumb-line. The plumb-bob on on the solo pictures are still available.
SKU: 320816 e Category: Surveying
Dutch Compass in case, C 1920On application
Waywiser by Cary London, C 1800On application
Wronght iron pair of dividers, early18th centuryOn application