File:The Locomotive (1908) (14784225675).jpg

Identifier: locomotive27hart (find matches)
Title: The Locomotive
Year: 1867 (1860s)
Authors: Hartford Steam Boiler Inspection and Insurance Company
Subjects: Locomotives Steam-boiler explosions
Publisher: Hartford, Ct. : Hartford Steam Boiler Inspection and Insurance Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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s,which is not shown, consisted of a cast-iron cylinder having a capacity of thirtyliters, or something over one cubic foot. It was immersed in a water-bath,just as Regnaults was, in order that the temperature (and therefore the pres-sure) of the air within it might be kept as constant as possible. The pressurein the artificial atmosphere tank could be increased at pleasure, by passing moreair into the tank from a reservoir containing compressed air at high pressure. The boiler used in generating the steam was situated in a different roomfrom the measuring apparatus, so as to avoid errors that might otherwise becaused by the heat radiated from it; and it was connected with the artificialatmosphere by means of a pipe that passed through the wall of the room.Every effort was made, in fact, to have the temperature of the observing roomsuniform and steady, and with this end in view, all artificial heat was shut offfrom them during the progress of the work. 1909.) THE LOCOMOTIVE 185 l ; j:
Text Appearing After Image:
Fig. 2.— Diagram Illustrating the Mercury Column Used forMeasuring the Richer Pressures. 186 THE LOCOMOTIVE, (April, The boiler itself is shown in Fig. 3. It consisted of a cylinder, D, of castbronze, approximately 6 in. in diameter, gl/2 in. high, and % in. thick. The cover plate was secured in place by bolts, andwas provided with a copper packing ringof square section. The boiler was heatedelectrically, the temperature being raisednearly to the boiling point correspondingto the given pressure in the artificial at-mosphere, by passing an electrical currentthrough some strips of the alloy knownas constantan, these (not shown in theillustration) being wrapped around theboiler on the outside, and insulated fromit and from one another by sheets of as-bestos paper. The temperature of thewater being raised to within somethinglike io° of the boiling point under the pres-sure for which the artificial atmospherewas regulated, the remainder of the heat-ing was effected by passing an electri

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