The Locomotive . is never morethan four per cent, in error, and which suffices for most of the requirementsof the inspector, so far as accuracy is concerned. It is illustrated in Fig. 3. Rule 3. Divide the base of the segment into halves, and divide one ofthese halves again into halves. Through each point of division of the baseline of the segment draw a vertical line up to the circle. -Measure both ofthese vertical lines, and to the long one add four times the short one. Multiplythe sum by the base of the segment, and divide by 6. (The result cannot bein error by more than four per cent., if
The Locomotive . is never morethan four per cent, in error, and which suffices for most of the requirementsof the inspector, so far as accuracy is concerned. It is illustrated in Fig. 3. Rule 3. Divide the base of the segment into halves, and divide one ofthese halves again into halves. Through each point of division of the baseline of the segment draw a vertical line up to the circle. -Measure both ofthese vertical lines, and to the long one add four times the short one. Multiplythe sum by the base of the segment, and divide by 6. (The result cannot bein error by more than four per cent., if the measurements are accurately made.) The three approximate rules given above apply to segments of any heightwhatever. The unbraced segments on the heads of horizontal tubular boilersvary within comparatively narrow limits, however, and this circumstance makesit possible to give, for the use of the inspector, approximate rules which aresimple in form, and which, at the same time, are fairly accurate for segments. Fig.
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