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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 Excerpt:... proportion to the weight of metal and capacity of cranes, presses, &c, may be approximated, and the following list of weight of forgings required for different calibers in the English service will assist the calculation: Particulars of forgings for English gun lubes. The forging for the 100-ton gun cited above is that which was supplied for the Armstrong gun furnished the Italian Government, the tube for which was made in two parts. That for the 110-ton gun now to be made for the English Government will be in one forging. If the cost per ton be fixed for the smaller guns, and an increasing ratio be established per ton as the caliber increases, the approximate cost of the forgings for guns of like pattern can be determined. From an inspection of the table given «,bove it will be seen that it is within the resources of many of our own steel works to supply castings for a large number of the different calibers. These works, however, are deficient in forging apparatus. In the above estimates the cost of a steam hammer is not given, as the Board unanimously approves the adoption of the press; but it will be pertinent to add that, in order 1o produce a given amount of work, the hammer is the more expensive tool. MACHINES AND TOOLS FOR GUN FACTORY. On the matter of plant for gun factory the Board obtained information from the principal gun facories of England, France and Russia, where machines and tools are in operation, and from the largest establishments where such tools are made, but chiefly from Messrs. Greenwood &Batley, of Leeds, Mr. Hulze& Co., of Manchester, and Messrs. Varrell, Elwell & Middleton, of Paris. In considering this part of the subject it was decided that there were three classes into which guns could be advantageously div...