. Locomotive engineering : a practical journal of railway motive power and rolling stock . per minute. With 369 The conductor knew no better, and wassatisfied ; so at the next station he tele-graphed the valuable information to head-quarters. The trainmaster- was stumped,too, and came out to the engine the nextday to have Sam show him where an en-gines jewels were located. % @ ■ ii At the Columbus, O., shops of the Pan-handle they make all their large millingcutters, reamers, rose bits, etc., of wroughtiron and case-harden them. They havegiven the matter of small tools a greatdeal of attention
. Locomotive engineering : a practical journal of railway motive power and rolling stock . per minute. With 369 The conductor knew no better, and wassatisfied ; so at the next station he tele-graphed the valuable information to head-quarters. The trainmaster- was stumped,too, and came out to the engine the nextday to have Sam show him where an en-gines jewels were located. % @ ■ ii At the Columbus, O., shops of the Pan-handle they make all their large millingcutters, reamers, rose bits, etc., of wroughtiron and case-harden them. They havegiven the matter of small tools a greatdeal of attention at these shops. Thesetools do as hard and heavy work as anjsteel ones, and can be more easily made,and in forms that it is almost impossibleto harden in steel. It is worth a trial any-where. Bourdon vs. Others. In the early history of pressure gagesthere were two types ot spring known asthe Bourdon tube and the latter being first made in flatteneddisk form bolted or fastened rigidly at thecircumference, motion applied at the cen-ter of such a design caused an effort at. HiNCKD Diaphragm. corresponding lessening of the diameter.(Cut a strip of paper and fasten the twoends tightly to a board ; now lift the cen-ter. ) Rigid bolting at the circumference,working against natural laws, produced afractured head. The next move was tocorrugate the head, which, although animprovement, did not stop the trouble ; itmerely postponed the fracture. Aboutthis time the secret (a simple one) was dis-covered by E. A. Wood, of Utica, N. Y.,who overcame the trouble by flanging thecircumference of the heads and fasteningat a point which acted as a hinge, andlocking the heads in an elastic band—a rad-ical departure. This capsule spring, being circular inform, has, by over-zealous competitors,been called one of the old diaphragmclass. The Bourdon tube originated inEurope, subsequently being adopted bymany gage-makers in America who hadbeen obliged to abandon their diaphragmgages. Mr.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
