6 7 



Campylometer. A pocket instrument capable of giving at one 

 reading the metric length of any line, straight or curved, 

 on a map or plan. 



Capillary Electrometer. See Electrometer. 



Carbolimeter. An instrument for the estimation of phenol 

 (carbolic acid). 



Carbolimeter, Muter's. 



Carbonate of Lime Apparatus, Hall and Russell's. For the deter- 

 mination of small quantities of carbonates. 



Carbonometer. An instrument for detecting the presence of 

 an excess of carbonic acid by its action on lime water. 



Carburometer. An instrument for determining the composition 

 of gases contained in carbonic oxide, hydrogen, etc. 



Cardiograph. An electrical recording instrument which, when 

 placed in contact with the human chest, will register 

 graphically the comparative duration and intensity of the 

 heart's action. See also Electrocardiograph. [21.] 



Cardioid Condenser. See Condenser. [2, 22, 26.] 



Cardisygmograph. A combination of the cardiagraph and the 

 sygmograph (q.v.). [21.] 



Carpenter's Gauge. A gauging tool used by carpenters for 

 marking off woodwork. 



CarrS's Freezing Apparatus. See Freezing Apparatus. [20.] 



Cascade, Gassiot's. An electric apparatus for use with an air 

 pump to illustrate electrical phenomena. 



Cassegrain Telescope. See Telescope. [3, 11, 13, 18.] 



Cassela Petrol Tank Gauge. For indicating the amount of 

 petrol in the tank. [6, 21.] 



Catadioptric Light. A system of illumination in which reflection 

 and refraction are both employed (in lighthouse work). [7.] 



Catadioptrical Telescope. See Telescope. 



Cathetometer. A horizontal telescope moving on a graduated 

 vertical support for measuring, at a distance, differences of 

 vertical heights. [2, 3, 4, 6, 13, 15, 17, 18, 19, 21, 25, 26, 27.] 



Catopter. A reflecting optical instrument ; a mirror. 



Catoptric Cistula. A box with several sides, lined with looking- 

 glasses so as to multiply images of any object placed in the 

 box. 



Catoptric Dial. A dial in which the indications of the hour are 

 read by reflection in a mirror. 



Catoptric Light. A mirror, or series of concave mirrors, prefer- 

 ably parabolic, by which the rays from one or more lamps 

 are reflected in a parallel beam so as to render the light 

 visible at a great distance. [7] 



Catoptric Telescope. See Telescope. 



Cavalry Sketching-Board. A military sketching-board per- 

 mitting sketches to be made on horseback. [2, 15, 17, 20, 

 21, 24, 27.] 



Cecograph. A French writing machine for the blind ; a chiragon. 



Celestial Globe. See Globe. [2, 13, 15, 20, 27.] 



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