. American engineer and railroad journal . od aroundthe screws, it will be fimnd that when too small bits ateused, the fibers in tJiewood around the screwsarecrushedaud destroyed,hut when the right sizeof bit is used the threadin the wood around theHcrew looks clean cut. thetexture of the fibers isprtosed and the tit in thcwood on the sciew re-semhles the appearanceof a nut on a holt. When Uie j screw wasscrewed into a J hole itsfull length of thread, orlive inches, it requirtd aforri- of )0 pounds lo pull It out; therefore it is safe enough for any tem-porary job under a sfady stress lo l
. American engineer and railroad journal . od aroundthe screws, it will be fimnd that when too small bits ateused, the fibers in tJiewood around the screwsarecrushedaud destroyed,hut when the right sizeof bit is used the threadin the wood around theHcrew looks clean cut. thetexture of the fibers isprtosed and the tit in thcwood on the sciew re-semhles the appearanceof a nut on a holt. When Uie j screw wasscrewed into a J hole itsfull length of thread, orlive inches, it requirtd aforri- of )0 pounds lo pull It out; therefore it is safe enough for any tem-porary job under a sfady stress lo lift one ton iu a I lagscrew, as this gives about four as factor of siifelv iupulling out of the woiid, and there is no dangrr of puUiugoff the Bcrew itself, because at the place of the core whereit could break it iu about Ji inch, in diameter = 0 3Tsquare inch area. Assuming ultimate tensile strength to be .5(1,000 poundsper square inch, the breaking load would be X 18,500 pounds; thus ilifre is no danger at all of the screw. rise through the pipe J, it enters the jet at the opening C,passes around through the bend and owing to the taper ofI be nozxie is forced down the pipe wiih considerable en-ergy. Any air which might he mingled with the water willrise IQ the drum as the water leaves the opening Ji. The purpose of the , inch tapping made into the roz«Ieat the upper aide is to omit any particles of nir that mightsettle In the Jet proper when the pipes of the car are beingfilled with water. While this sealed Jet can be used to greatadvantage on almost any system of hot water heating it ^iven its best results when u>(ed in connection with iiold4Duplex Uoubte Coil which producer a double or divided cir-culation; one of the pines running around one side of thecar and the other on the opposite-, as is also shown in theengraving- It will be noted Is dtl«d with boththe Gold Thermostatic Steam Trapand Improved Train PipeValve. This Sea
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
