Four inch pocket case of drawing instruments by T.Heath
1720-1753
Pocket case of silver mathematical instruments
1728-1733
Architectural rule
1720-1753
Six inch brass sector, 1720-1753.
1720-1753
Semi-circular protractor 12-inch
1720-1753
Pair of 6-inch brass callipers with sector
1720-1753
Proportional compasses
1720-1753
11 inch altazimuth theodolite with telescope tube of square section
1720-1753