. The Locomotive. ppreciable length. Thethreads on the bolt tend to prevent this reduction in area, first because the space between threads is not greatenough to allow it to properly take place,and second because the greater amount ofmetal in the threads being under less unittension does not contract as much itselfand so acts to prevent the grooved por-tions from reducing. The net result ofthis reinforcing action under static load-ing is an increase of about 14% in the Staybolt End, Showing How strength of a bolt over that of a plain The Deep Incisions of The ° . Nippers Prevented Necking cyli
. The Locomotive. ppreciable length. Thethreads on the bolt tend to prevent this reduction in area, first because the space between threads is not greatenough to allow it to properly take place,and second because the greater amount ofmetal in the threads being under less unittension does not contract as much itselfand so acts to prevent the grooved por-tions from reducing. The net result ofthis reinforcing action under static load-ing is an increase of about 14% in the Staybolt End, Showing How strength of a bolt over that of a plain The Deep Incisions of The ° . Nippers Prevented Necking cylinder of cross-sectional area equal to Down, the area at root of the threads* — and this despite the stress concentration at the roots of the threads. The threads, on the other hand, are being continually weakened through the action of the nut, especially in cases where the parts are frequently disconnected. When a nut is run on and off it receives a certain amount of rough handling and misusage with the wrench,. *Catlicarts Machine Design. (Continued on Page 86) 84 THE LOCOMOTIVE. [July,
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