. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . 00 1600 900 1800 900 2700 1100 8200 1200 1200 800 2100 1800 1900 1100 178 RAILROAD CONSTRUCTION. §153. Q H tf & H O0*0 a CQOHO o . Ooi ^ oa 5 - J^9 51 H 03 O z > iz;OO J <3 oooooooooooooo»coQOi>coaoxaoc-GO 2-3 u - oooo O O lO oO C^ CO CO o o o•coo CVJ Oi Ci o o o o o oo lt o o o CQ 1-1 Oi (M 07 W oooo • oooooooooooooooo • oooooooooooo C5 t- O CO • GO oo GO O O CO 00 GO X) O OD 00 fe M (« a c t^ c3 o CQ o o o o O CQ ooo O O «DCQ OO • • -o ooooo
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . 00 1600 900 1800 900 2700 1100 8200 1200 1200 800 2100 1800 1900 1100 178 RAILROAD CONSTRUCTION. §153. Q H tf & H O0*0 a CQOHO o . Ooi ^ oa 5 - J^9 51 H 03 O z > iz;OO J <3 oooooooooooooo»coQOi>coaoxaoc-GO 2-3 u - oooo O O lO oO C^ CO CO o o o•coo CVJ Oi Ci o o o o o oo lt o o o CQ 1-1 Oi (M 07 W oooo • oooooooooooooooo • oooooooooooo C5 t- O CO • GO oo GO O O CO 00 GO X) O OD 00 fe M (« a c t^ c3 o CQ o o o o O CQ ooo O O «DCQ OO • • -o oooooooooooooooooooooooooooooooo Oi>CQCQO0i0500OO00C0C00005t- a. §154. TRESTLES. 179 On page 177 there are quoted the vahies taken from the U. reports on the strength of timber, the tests probablybeino- the most thorough and reliable that were ever made. On page 178 are given the average safe allowable work-in o-unit stresses in pounds per square inch, as recommendedb^^the committee on Strength of Bridge and Trestle Timbers,the work being done under the auspices of the Association ofEailway Superintendents of Bridges and Buildings. The reportwas presented at their fifth annual convention, held in NewOrleans, in October, 1895. 154. Loading. As shown in § 138, the span of trestles isalways small, is generally 14 feet, and is never greater than ISexcept when supported by knee-braces. The greatest load thatwill ever come on any one span will be the concentrated loadingof the drivers of a consolidation locomotive. With spans of 14feet or less it is impossible for even the four pairs of drivers tobe on the same span at once. The weight of
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