. The railroad engineer's practice . iV is the number of oscillations, and e is the dis-tance from the point of suspension to the centre of gravityof the section, in inches. The cardboard should be heavy,otherwise it may be difficult to get it to continue to oscil-late for so long a time as a minute. The oscillations inhalf a minute multiplied by two would of course be thesame, but it is difficult to count them exactly, and anyerror is doubled in the result. For columns acting asbraces, a similar process may bo employed. However,their sections are not usually continuous ; for example, the Phoe
. The railroad engineer's practice . iV is the number of oscillations, and e is the dis-tance from the point of suspension to the centre of gravityof the section, in inches. The cardboard should be heavy,otherwise it may be difficult to get it to continue to oscil-late for so long a time as a minute. The oscillations inhalf a minute multiplied by two would of course be thesame, but it is difficult to count them exactly, and anyerror is doubled in the result. For columns acting asbraces, a similar process may bo employed. However,their sections are not usually continuous ; for example, the Phoenix column, No. 4 in the previous table, sometimeshas spaces left between the sections which compose it,occupied by thimbles or iron tubes around the cutting out the cardboard figure in such a case, theplaces occupied by the rivets should bo represented merelyby a narrow piece, sufficient only to hold the sections sothat they shall oscillate together. The following are someother forms of bracing for sustaining 78
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