. Electric railway journal . Bendir DIAGRAM FOR DETERMINING STRENGTH OFWOODEN BEAMS way bridge floors are found, the under course ofplanking should preferably be of creosoted timber and,whenever possible in renewing plank floors, creosotedtimber under decking and, whenever possible, creosotedwood block wearing surfaces should be substitutedin the interest of economy. The greater number ofhighway bridges as now built which call for woodfloors make provision for a wood block wearing surface,as it is well known that a 3-in. or 4-in. wood block sur-face will outwear an ordinary plank surface sever
. Electric railway journal . Bendir DIAGRAM FOR DETERMINING STRENGTH OFWOODEN BEAMS way bridge floors are found, the under course ofplanking should preferably be of creosoted timber and,whenever possible in renewing plank floors, creosotedtimber under decking and, whenever possible, creosotedwood block wearing surfaces should be substitutedin the interest of economy. The greater number ofhighway bridges as now built which call for woodfloors make provision for a wood block wearing surface,as it is well known that a 3-in. or 4-in. wood block sur-face will outwear an ordinary plank surface severaltimes FT! A TYPICAL I-BEAM SPAN, UNION TRACTION COMPANY OF INDIANA May 17, 1919 Electric Railway Journal 959 Bridge Records Are Very Useful inMaintenance Work Bridges are constantly being referred to in main-tenance correspondence. The general manager oftenwishes to know whether a foreign car will operatesafely over the road. The freight department needssimilar information as to acceptance of steam roadfreight cars. The bridges on the road usually presentsome limiting features the details of which shouldbe on hand for ready reference in such cases. Clearanceand strengthening problems, and addition and better-ment matters, are continually arising, and these callfor prompt and accurate information without waitingfor field investigation. For these reasons it has beenfound advisable to have records at hand which willgive all data ordinarily required, and the expensefor obtaining the field information and preparing andrevising the records will be found very small in com-parison with their value
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