. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . read, the material inIinth cases being machine steel: Onelicjlt, l^ ins. diameter, by 24^ ins. long,with cut thread, had a tensile strength■ f 88,900 lbs. and another bolt, IA by 245^ ins. rolled thread,when pulled, showed a tensile lbs. The rolled thread is, of course, notad-ipted for every purpose, still theselists show that where it may be usedthere is a great gain in strength and ai-onsequent saving of weight and saving in weight of material is ab
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . read, the material inIinth cases being machine steel: Onelicjlt, l^ ins. diameter, by 24^ ins. long,with cut thread, had a tensile strength■ f 88,900 lbs. and another bolt, IA by 245^ ins. rolled thread,when pulled, showed a tensile lbs. The rolled thread is, of course, notad-ipted for every purpose, still theselists show that where it may be usedthere is a great gain in strength and ai-onsequent saving of weight and saving in weight of material is about20 per cent.; that is to say. material 20per cent, lighter than would be used ifthe threads were to be cut. may be usedif the threads are to be rolled, and therewill be no loss of strength. There isalso a gain in time, at least twice asmany bolts may be rolled as can be cutill the same period. These machines, arc made in two sizes,the I in. machine is complete with coun-tershaft, wrenches, and five pairs of dies,for bolts of ■/2. H- %. H and I in. in di-ameter. The weight of this machine is. ACME THREAD ROLLISG View. about 10,000 lbs., and the floor space itoccupies is 4 ft. 10 ins. by 6 ft 6 2 in. machine is also complete withcountershaft, wrenches and five pairs ofdies, which run from i. i}4. i!^, i>i and2 ins. The weight of the larger machineis about double that of the smaller, andthe floor space for either machine is 92 RAILWAY AXD LOCOMOTIVF. 1-XGINEKKING Fcbruafy, iyo6. about 7x9 ft. The tool, whicli will nodoubt become very popular, is madeby the Acme Machinery Company, ofCleveland, Ohio. Traveling Engineers Circulars. The Traveling Engineers Associa-tion, whose object is to improve the lo-comotive engine service of Americanrailroads, has issued a circular of en-quiry concerning a most important sub-ject. It is on Care of locomotive boil-ers at terminals and while in are twelve questions asked, andif these are intelligently an
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
