Mathematical and Philosophical Instruments.

Class 15.—Apparatus and instruments used for mathematical purposes.

Apparatus and instruments illustrating practical geometry, land-surveying, topography, and geodesy; compasses, calculating machines, levels, mariners' compasses.

Apparatus and instruments for measurement: verniers, micrometric screws, dividing machines, &c.; scales for scientific uses.

Optical instruments. Astronomical instruments. Physical and meteorological instruments, &c. Instruments and apparatus requisite for laboratories and observatories.

Weights and measures of various countries. Coins and medals.