. The trackman's helper, a handbook for track foremen, supervisors and engineers . he frog is to desired locations of the theoretical points of frogsfor the ladder track are at the intersections of thestring AB and the lines given by strings stretchedover the tacks at C D-C D, etc. The above rule will work well where the two tracksdiverge at an angle corresponding to the frog angle, FROGS AND SWITCHES 287 but where this angle of divergence is different fromthe frog angle in the main track, or when the tracksrunning from the ladder track are not parallel tothe main track, these will meet
. The trackman's helper, a handbook for track foremen, supervisors and engineers . he frog is to desired locations of the theoretical points of frogsfor the ladder track are at the intersections of thestring AB and the lines given by strings stretchedover the tacks at C D-C D, etc. The above rule will work well where the two tracksdiverge at an angle corresponding to the frog angle, FROGS AND SWITCHES 287 but where this angle of divergence is different fromthe frog angle in the main track, or when the tracksrunning from the ladder track are not parallel tothe main track, these will meet the ladder track ata special angle and will leave the ladder track on acurve, or else will require a frog of special number,which can be ascertained by the following method: To ascertain the number of frog needed. The linesin the diagram. Fig. 64, represent the rails of twotracks. Measure across between the track rails at thepoints marked A and B, each of which is at an equaldistance from C, where the rails cross, then measurethe distance, C B. Now divide the distance, C B, by. Fig. G4. Diagram for Determining Frog No. the distance, A B, and the result will be the numberof the frog required. Suppose the distance, A B, istwelve inches, and the distance, C B, nine feet; itwould require a one to nine frog, or as it is generallycalled, a number nine frog. The distance, A B, maybe measured where the rails or lines are only six oreight inches apart, but the result will always be thesame in proportion to the distance from C to tracks are to run parallel with each other, itis best to gage the distance they are to be apart bymeasuring from the nearest rail of a permanent trackadjoining, if in good line, or from the center of themain track in yards. 288 THE TRACKMANS HELPER In ladder tracks the distance between frog points,where they are all of the same number, is approxi-mately equal to the distance between track centersmultiplied by the frog number. XIX USE AND CARE OF TRACK T
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