. Railroad digest . ake the place of the facia boards. It isapparent that with given outside dimensions, the pressed steelroof permits of a considerable increase over the usual widthand height inside. Vol. No. I. RAILROAD DIGEST [ Shop Practice, Machinery and Tools ] Proper Arrangement of Quarter-Twist Belts FciUlciis Magazine. Nov., 1901, p. considering the relative directions of rotation of beltdriven shafting, two nou-intersecting shafts at right anglesmay be combined in two different ways. These are shown inFigs. 1 and 2. Any two actual shafts, if looked at in a par-ticular di
. Railroad digest . ake the place of the facia boards. It isapparent that with given outside dimensions, the pressed steelroof permits of a considerable increase over the usual widthand height inside. Vol. No. I. RAILROAD DIGEST [ Shop Practice, Machinery and Tools ] Proper Arrangement of Quarter-Twist Belts FciUlciis Magazine. Nov., 1901, p. considering the relative directions of rotation of beltdriven shafting, two nou-intersecting shafts at right anglesmay be combined in two different ways. These are shown inFigs. 1 and 2. Any two actual shafts, if looked at in a par-ticular direction, will be represented either by Fig. 1 or by For each of these combinations there is only one methodof arranging the pulleys and belt, for a drive without guidepulle3s. Fig. 3 shows the arrangement for the combination ofshafts indicated in Fig. 1, while Fig. 4 illustrates that cor-responding to Fig. 2. In each case four views are given. IfFig. 1 be considered to be a plan, then the four views in Fig. 3. The mandrels are finished so the flue is a nice fit whencold, and when heated for welding the flue goes on swedges or hammers also conform to the flue, so thatwhen welded the flue is finished smooth and true to size insideand outside. The machine is automatic and ramming the flueon the mandrel for welding starts the machine, the flue be-ing turned and the two hammers operated together. Whenscarfing, one hammer only is used. In working the machine bybaud the rear bracket and clutch are removed and a crank issubstituted. The machine ready for shipping weighs 650 lbs., and it re-quires a floor space 18 in. square and is made by Maddocks &Herschell. Princeton, Ind. Many of them are now being usedin railroad sliops. ■ ♦ • New Boiler Blow-Off Valve EiKjinvcrinfj Xcu:<!, Dec. 12, 1901, p. 400. The design of a boiler blow-off valve or cock which shall al-ways be tight when closed and never give trouble in openingor closing, is one which has balked many
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