CALORIFIC POWER OF FUELS. 



and having an unusually high tenacity, seems admirably fitted 

 for the purpose. A represents the bomb, C the screw-cap, 

 B the cover, which is placed on the bomb cylinder and held 

 down by the screw-cap. ' * The cover is provided with a neck 

 into which fits a cylindrical screw , holding another screw H. 

 On the side of the neck is an aperture G, between the lower 

 end of .Z> and the shoulder. In D is a washer of lead, on 

 which the lower edge of E fits. By opening or closing the 

 screw F the narrow passage from z is opened or closed. The 

 opening is used for admitting oxygen at a high pressure 

 through a narrow passage to charge the bomb. In B is an 

 aperture through which passes the platinum wire H, which is 

 separated from the metal of the cover 

 by insulating material. Hard vulcan- 

 ized rubber serves very well for this 

 purpose. Fastened to the lower side 

 of the cover is another platinum rod, /, 

 between which and H an electrical con- 

 nection is made with a very fine iron 

 wire. A screw-ring holds the small 

 platinum capsule, in which the sub- 

 stance to be burned is placed. At KK 

 are ball-bearings of hard steel to avoid 

 friction in screwing the cap down." 



" The large cylinders N and O are 

 made of indurated fibre, and covered 

 with plates of vulcanized rubber. A 

 stirrer serves for equalizing the temper- 

 ature of the different portions of water 

 after the combustion is completed." * 



The thermometer used is by Fuest 



of Berlin, graduated to -j-J-Q degree, and can be read with a 

 magnifying-glass to y^ degree. 



FIG. 25. ATWATER BOMB. 



*Prof. W. O. Atwater, in Bulletin No. 21, U. S. Dept. of Agriculture, 

 1895, pages 124 and 126. 



