. Journal of electricity. TREATING PLANT FOR FIRPOLES There is a cylindrical tank 8 feetin diameter and 10 feet 6 incheshigh, at the bottom of which isa steam radiator consisting of116 feet of 2-inch pipe. Over thesteam coil is a grid of channeliron upon which the butts of thepoles rest. A steam derrick com-pletes the outfit. 398 JOURNAL OF ELECTRICITY You must have poles enough to carry the load—BUY A LIBERTY BOND [Vol. 40—No. 8. TWISTING OF DOUGLAS FIR POLES The tendency to spiral as displayed by Doug-las fir poles is one of their chief drawbacks. bility. Availability has been mentioned; cos
. Journal of electricity. TREATING PLANT FOR FIRPOLES There is a cylindrical tank 8 feetin diameter and 10 feet 6 incheshigh, at the bottom of which isa steam radiator consisting of116 feet of 2-inch pipe. Over thesteam coil is a grid of channeliron upon which the butts of thepoles rest. A steam derrick com-pletes the outfit. 398 JOURNAL OF ELECTRICITY You must have poles enough to carry the load—BUY A LIBERTY BOND [Vol. 40—No. 8. TWISTING OF DOUGLAS FIR POLES The tendency to spiral as displayed by Doug-las fir poles is one of their chief drawbacks. bility. Availability has been mentioned; cost is nat-urally closely related therewith since the timber foundin the greatest quantities will usually be the cheapestin first cost, and is in this case. The strength ofDouglas fir is well known. Says the U. S. ForestService Bulletin No. 88: Douglas fir may, perhaps,be considered as the most important of Americanwoods. * * * As a structural timber it is not sur-passed, and probably it is most widely used and knownin this capacity. Therefore, in considering Douglasfir as a substitute for cedar, durability is the most im-portant point, since it is the characteristic in whichthe former is lacking as compared with the latter. One of the best posted men on poles in the busi-ness makes this statement: The best substitute thatcan be had on this coast is Douglas fir, and we believethat while in their green state they would be sub
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
