Locomotive appliances . re forced in LOCOMOTIVE APPLIANCES. 215 the opposite direction, this film of scale, occupyingthe space, offers resistance to the fibre of the metalresuming its normal position. In the meanwhilescale is deposited in the open fibre of the metal onopposite side of stay-bolt, and as this process con-tinues, the film of scale being deposited in this everincreasing opening has the effect of wedging themetal apart al-ternately on oneside and thenon the other,finally causingthe stay-bolt topart at thatpoint. Thestay-bolt doesnot break nextto the fire-boxsheet. Due tothe fact th
Locomotive appliances . re forced in LOCOMOTIVE APPLIANCES. 215 the opposite direction, this film of scale, occupyingthe space, offers resistance to the fibre of the metalresuming its normal position. In the meanwhilescale is deposited in the open fibre of the metal onopposite side of stay-bolt, and as this process con-tinues, the film of scale being deposited in this everincreasing opening has the effect of wedging themetal apart al-ternately on oneside and thenon the other,finally causingthe stay-bolt topart at thatpoint. Thestay-bolt doesnot break nextto the fire-boxsheet. Due tothe fact thatthis end of thebolt is kept atsuch a temper-ature that themetal is moreelastic and yields to the change of position withoutopening the fibre and exposing it to the entranceof this deposit of scale. To overcome this difficulty many other mechanicaldevices have been designed, one of which, known asthe Johnstone flexible stay bolt, derives its name fromthe designer, a mechanical superintendent o( a largeAmerican Fig. Flexible Stay Bolt. 216 LOCOMOTIVE APPLIANCES. It will be seen by reference to the accompanyingengraving (Fig. 1) that this device is composed of twoparts; the plug is made of mild steel, while the stay-bolt proper is made of any of the standard brands ofiron generally used for the purpose, or of steel, whichis much cheaper and has a greater tensile plug is first made as a drop forging; the ball onend of stay-bolt is formed in an upsetting machine;the ball is then inserted into the cup or plug, and themetal of the plug folded down around the ball. The method of applying this stay-bolt is as follows:The plug is screwed into the outer sheet while thestay-bolt proper is screwed through the inner or fire-box sheet, the square end of the stay-bolt enabling theman on the inside of fire-box to screw in the stay-bolt,while the man on the outside screws in the the stay-bolt is screwed into place, it is cut off onthe inside and ha
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
