. The street railway review . If this is columns on the lower stories would be slill larger than these, thesize depending in all cases on the load they are designed to great many tests have been made on the strength of mill col-umns and it is now considered giKjd practice lo allow a load of ^2 /O^/O 7 ^j-smi HKVit. w. ^iSOLT ^-■/.. ,5>s>W> ^^ I ■ I L^i^J =1 ■/2>:/7 i^/^S/ /oCo^c/f/^ r.\F! sKi-iii ix •iii!;i>i(;ii i:.\sK.:.\T. done care must be exercised as dry rot will follow if any ainiglucovering is put on timlwrs before they arc thoroughly scaso
. The street railway review . If this is columns on the lower stories would be slill larger than these, thesize depending in all cases on the load they are designed to great many tests have been made on the strength of mill col-umns and it is now considered giKjd practice lo allow a load of ^2 /O^/O 7 ^j-smi HKVit. w. ^iSOLT ^-■/.. ,5>s>W> ^^ I ■ I L^i^J =1 ■/2>:/7 i^/^S/ /oCo^c/f/^ r.\F! sKi-iii ix •iii!;i>i(;ii i:.\sK.:.\T. done care must be exercised as dry rot will follow if any ainiglucovering is put on timlwrs before they arc thoroughly scasone< plastering is sufficiently porous if without a skim coat, lopermit seasoning. Whenever it is desired to paint the wood work about (lOO lb. per s(|. in. of the sectional area of hard pine columnsof ordinary length with flat ends. This gives a factor of safety of alittle over six based on a crushing strength of lb. per sq. columns are of course a lillle cheaper and possess considera-. C/?oss Ssc 7-/0/1/^r/^/7s UI; Oh IMTS. time should Ik- .illowed fi>r seasoning Itetore paiiu is applieil, ;il-lliough whitewash or cold water jiainl may be applied at any time. .iong the important details of this construction are the colunmsand the method of supporting the beams on tliem. The colunms I»U- niori- slri-iijilb llian round ones turned from the same limbers,but the latter are more generally used as they obstruct the light is generally considered the IksI practice to iMirc a hole about Ij-iin. in diameter from end lo end. lbroii);b the ceiUer of all cohumis AiG. JO. 1903.] STREET RAILWAY REVIEW. 459 and to connect this with halt-inch holes through the sides at eachend so as to prevent nndue checking while drying. Both ends of the coUnnns are caretiiUy cut oflf. The bottoms ofthe lower columns rest on cast iron plates, which are generally seton brick or concrete foundations, and the tops of the columns havecast iron ca
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
