CLASSIFICATION OF THE COLLECTION. 



ARITHMETIC. 



Apparatus for teaching arithmetic. Calculating machines. Instruments 

 for solving equations. Slide rules. Numbering and enumerating appa- 

 ratus, &c. 



GEOMETRY. 



Instruments used in geometrical drawing. Methods of copying. Panti- 

 graph, micrograph. Peaucellier's cell and parallel motion. Machines for 

 description of curves and specimens of the curves they describe, including 

 geometric turning. Instruments for giving graphic representations of 

 phenomena. Models to illustrate descriptive geometry. Specimens to illus- 

 trate the process of making models according to a design. Models to illus- 

 trate solid geometry, perspective, crystallography, &c. Stereoscopic illustra- 

 tions of solid geometry. 



MEASUREMENT. 



Of length. Standard yard, metre, &c. Comparator for standards of length 

 (sight and touch). Gauges, measuring wheels, steel tapes, &c. Micrometers 

 and verniers. Cathetometers. 



Of area. Planimeters, &c. 



Of 'volume. Standard gallon, litre, &c. Pipettes, burettes. Meters for 

 gas, water, &c. 



Of angles. Divided circles, theodolites, clinometers, goniometers, &c. 



Of mass. Standard pound, kilogramme, &c. Vacuum and other 

 balances. 



Of density. Specific gravity bottles, areometers, &c. 



Of time.- Clocks and pendulums, chronometers, watches, and balance 

 wheels. Tuning forks for measuring small intervals of time. Chronographs. 



Of velocity. Such as Morin's machine. Strophometers, current meters, 

 ships' logs, &c. 



Of momentum. Ballistic apparatus. 



Of force. Spring balances, pressure gauges, torsion balances, &c. 



Of "work. Indicators, dynamometers, &c. 



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