. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . two guns following were also 6-in., ofannealed metal, the forgings being of domestic manu- _ ;_, . facture, as all have sincebeen, with the exception ofthose above the con-siderable delays made bywaiting for the first deliv-eries of the forgings, andthe lack of machinery andplant for the new and su-perior quality of work de-manded, guns and theircarriages are now beingturned out as fast as
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . two guns following were also 6-in., ofannealed metal, the forgings being of domestic manu- _ ;_, . facture, as all have sincebeen, with the exception ofthose above the con-siderable delays made bywaiting for the first deliv-eries of the forgings, andthe lack of machinery andplant for the new and su-perior quality of work de-manded, guns and theircarriages are now beingturned out as fast as thenew vessels are ready for Fig. 3.—6-inch breech-loading rifle, them. Finished guns have been subjected to the proof required bylaw, which constitutes a series of 10 rounds firedwith all possible dispatch. All guns have thus far stood the firing tests perfectly and havegiven satisfaction in service. The 6-in. guns, as mounted in broadside aboard the men-of-war, are shown in Pig. 3. The carriage is known as a gravity return ; the gun after beingfired runs down the slide (a) on the carriage trucks (bhb b)\ the training is done at (c) by thecogs, and the elevating at {d).. ORDNANCE. 571 In their main features the army and navy guns are alike, the most important ditfereneein construction being that, in the navy guns, the trunnion hoops are made of oil-temperedand annealed eastings, and are screwed on cold, while in the army these hoops are forged andassembled by shrinkage. In the matter of charges, also, the practice differs, in that the rulein the navy is to use a charge of powder equal to about one-half the weight of the shot,whilst in the army the weight of projectile is made proportionately much heavier. Thelio-liter projectile gives a high velocity with a relatively flat trajectory, which is best adaptedtcTtbe conditions of naval combat. There is certainly no mechanical difficulty in makingthese guns which cannot be overcome. The machinery of the finished surfaces requires
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
