. Electric railway journal . Chippingcan be done much more rapidly and with less danger tothe workmen than with hammer and chisel. Where quickwork, such as in clearing the track after a wreck oraccident, is necessary, such a tool is of great value. This air-operated cutting gun is most convenientlyoperated by three men. One guides the tool while theother two steady the extreme end. The gun weighs 65lb. and can be operated with an air pressure of 60 lb.,but from 90 to 110 lb. is desirable for heavy work. The tool is operated by means of a handle locatedat the extreme end of the air cylinder. Th
. Electric railway journal . Chippingcan be done much more rapidly and with less danger tothe workmen than with hammer and chisel. Where quickwork, such as in clearing the track after a wreck oraccident, is necessary, such a tool is of great value. This air-operated cutting gun is most convenientlyoperated by three men. One guides the tool while theother two steady the extreme end. The gun weighs 65lb. and can be operated with an air pressure of 60 lb.,but from 90 to 110 lb. is desirable for heavy work. The tool is operated by means of a handle locatedat the extreme end of the air cylinder. Three positionsare provided for the handle: First, a cut-off positionwhich closes the port so that the air connections canbe made. Second, a return-stroke position which drivesthe piston to the rear end of the cylinder. Third, a for-ward stroke position which sends the piston forwardto deliver the blow. For chipping work the valve handleis moved between the forward stroke and the return-stroke position at a convenient TAKING OFF A NUT THAT HAS BEEN BURRED Letter to the Editors Safety Code Standards for Forces ActingUpon Transmission Lines The Connecticut Company New Haven, Conn., May 11, 1918. To the Editors: The difficulty of teaching an old dog new tricks hasbeen clearly shown in the case of the v/riters article inthe Feb. 23 issue of the Electric Railway Journal onThe Forces Which Act Upon a Transmission him the use of the wind pressure value of 8 lb. persquare foot, the old standard, had become such a habitthat this value was used repeatedly instead of theSafety Code values in the last paragraph of the firstcolumn on page 365, and in the example in the secondcolumn on page 366. In the first instance, since the wind is not an elementof the load considered, the fact that the value shouldhave been 12 lb., instead of 8 lb., has little effect, butin the case of the example it is another matter. Usingthe correct value, the force becomes 213 lb. instead of142 lb., th
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