. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . r detail and consequently take moretime than ordinary track scales. 236 RAILWAY AND LOCOMOTIVE ENGINEERING. July, 1916. Electrical Department Catechism of the Electric Locomotive Continued Q.—What is used to hold the contactshoe against the third rail? A.—Springs. Q.—Where are these springs located? A.—Referring to Fig. 3, spiral springs(A) are used, through which passes thebar (B), this bar being held in the cast-ing (C). Q.—What arrangements are providedto adjust the shoe at the proper heig
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . r detail and consequently take moretime than ordinary track scales. 236 RAILWAY AND LOCOMOTIVE ENGINEERING. July, 1916. Electrical Department Catechism of the Electric Locomotive Continued Q.—What is used to hold the contactshoe against the third rail? A.—Springs. Q.—Where are these springs located? A.—Referring to Fig. 3, spiral springs(A) are used, through which passes thebar (B), this bar being held in the cast-ing (C). Q.—What arrangements are providedto adjust the shoe at the proper height? A.—In the type of third rail shoe con-struction shown by Fig. 3 an adjustmentis provided so that by loosening the bolts(D), of which there are three, the cast-ing can be raised or lowered, giving thenecessary adjustment. Q.—Is this arrangement universal? A.—No. Many times there are no ad-justments in the casting (C) referred to,but the adjustment is taken care of byadjustment in the support which carriesthe third rail shoe beam. Q.—What do you mean by the thirdrail shoe beam?. FIG. 3. A.—The third rail shoe beam is shownby (E) on Fig. 3, and is the beam towhich is fastened the casting carrying thethird rail shoes. Q.—Of what material is this third railshoe beam constructed? A.—It must be constructed of an insu-lating material, usually of wood. Q.—Why is this necessary? A.—When the third rail shoes are incontact with the third rail, they arealive, and all of the casting is alsoalive. Sufficient distance must be givenbetween the casting and the point of sup-port which is ground so that the elec-tric power will not creep along the shoebeam even when exposed to dirt, mois-ture, snow, etc. It is thus important thatthe shoe beam be kept clean and properlypainted with an insulating paint so as toprevent this creepage. Q.—What particular point is borne in mind when mounting these third rail shoebeams ? A.—Beams must be mounted on brack-ets, which are
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