Engines operated by means of hot air, called caloric engines, and engines operated by gas, or explosive substances, all act substantially upon the same general principles as steam-engines; the greatest distinction being between those engines wherein the generation of heat is by the combustion of fuel, and those wherein heat and expansion are produced by chemical action. With the exception of a limited number of caloric or air engines, steam machinery comprises nearly all expansive engines that are employed at this day for motive-power; and it may be safely assumed that a person who has mastered the general principles of steam-engines will find no trouble in analysing and understanding any machinery acting from expansion due to heat, whether air, gas, or explosive agents be employed.
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I am not aware that the derivation of our standard measures has been, in an historical way, as the foregoing remarks will indicate, nor is it the purpose here to follow such history. A reader, whose attention is directed to the subject, will find no trouble in tracing the matter from other sources. The present object is to show what a wonderful series of connections can be traced from so simple a tool as a measuring gauge, and how abstruse, in fact, are many apparently simple things, often regarded as not worth a thought beyond their practical application.In his cell at Holloway Ren Lalage was disposed to be communicative. He spat furiously, his dark eyes gleamed at the mention of the woman.The maneuver was executed, ending in a fairly tight circle after Jeff had skilfully leveled out of the drop.His own kin had been done to death, and he was going to avenge the murder. To this end he had caused Balmayne to be lured from his hiding place by those who knew how to bait the trap for the rascal. Once Balmayne was in his power he would be compelled to speak. And the night was very dark.
