Pocket case of silver mathematical instruments

1728-1733

Four inch pocket case of drawing instruments by T.Heath

1720-1753

Six inch brass sector, 1720-1753.

1720-1753

Architectural rule

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