65 



Calcimeter, Clarke's. For testing cement, slurry, limestone, etc. 



Calculating Instrument, Thacker's. A calculating machine con- 

 sisting of a cylinder with divided scales, working in an open 

 framework with triangular bars. [13, 15, 27.] 



Calculating Machine. A machine for calculating by mechanical 

 means. [13, 17, 20, 21, 27.] 



Calculating Rule. A slide-rule (q.v.). [5, 9, 13, 15, 16, 17, 20, 

 21, 24, 27.] 



Calculator, Fearnley's Universal. A calculating disc having a 

 long scale in spiral form. 



Caleidophone. See Kaleidiphone. 



Caleidoscope. See Kaleidiscope. [2.] 



Callendar Pyrometer. See Pyrometer. [13, 20, 21.] 



Callendar Recorder. See Recorder. [4, 21.] 



Calligraph. A writing machine. [20.] 



Calliper Square. A draughtsman's or mechanic's square, having 

 a graduated bar and adjustable jaw or jaws. [15, 20, 27.] 



Callipers. Instruments for measuring the external or internal 

 diameter of a body. Used by the turner in lathe work. 

 See also Micrometer Calliper, Micrometer Dial Calliper, and 

 Micrometer Screw Contact Calliper. [2, 5,13, 15, 19, 20, 25.] 



Callipers, Bow. Used for measuring the external diameters of 

 large objects, such as round timber. [6, 15, 20, 24, 26, 27.] 



Callipers, Gunner's. Callipers for calibrating shot, shell, guns, 

 etc. [1, 27.] 



Callipers, Hull. Callipers for taking the thickness of square 

 timber. [15.] 



Callipers, Outside. Callipers for measuring the external diameter 

 of cylindrical pieces of material. [17, 20, 21, 25.] 



Callipers, Vernier. Callipers with vernier reading. [25.] 



Calorescope. An apparatus for producing heat for demonstra- 

 tion purposes. 



Calorigraph. A recording calorimeter (q.v.). 



Calorimeter. An apparatus for measuring the quantities of heat 

 received from or by bodies or developed or absorbed by 

 some mechanical or chemical process, such as chemical 

 combination, friction, combustion, etc. Used also in the 

 determination of the specific heats and calorific values of 

 substances. In its simplest form it consists of a thin vessel, 

 usually cylindrical, of brass or copper. There are various 

 modifications depending upon the materials (solids, liquids 

 or gases), the specific heats or calorific values of which are 

 to be determined. [2, 4, 13, 15, 17, 19, 21, 26] 



Calorimeter, Gas, Boys's. A calorimeter for determining the 

 calorific value of combustible gases, depending in principle 

 on a small stream of water abstracting the heat fr^m a 

 slowly-travelling stream of gas. [19.] 



Calorimeter, Fischer's. A silver calorimeter for determining 

 heat of combustion. 



