. The trackman's helper, a handbook for track foremen, supervisors and engineers . Standard Frog Frogs. Fig. 56 is an outline diagram of a triangle C A E is the tongue. C E is the heel ofthe tongue. The channel at K is the mouth. Its nar-row part, P H, is the throat. The wings, F G, andH I, support the treads of the wheels from the pointB, to the throat. L M is the heel of the frog. The 266 THE TRACKMANS HELPER angle is the divergence of the lines, A C and A intersection of the lines at A is the true the-oretical point of the frog. As this point is too weakfor service, it is rou
. The trackman's helper, a handbook for track foremen, supervisors and engineers . Standard Frog Frogs. Fig. 56 is an outline diagram of a triangle C A E is the tongue. C E is the heel ofthe tongue. The channel at K is the mouth. Its nar-row part, P H, is the throat. The wings, F G, andH I, support the treads of the wheels from the pointB, to the throat. L M is the heel of the frog. The 266 THE TRACKMANS HELPER angle is the divergence of the lines, A C and A intersection of the lines at A is the true the-oretical point of the frog. As this point is too weakfor service, it is rounded off where the tongue is aboutone-half inch wide. The frog number is the ratio ofthe perpendicular, A D, the length of the point to thebase, C E. Thus, if the length, A D, be 7, 9 or 10times C E, the frog is called a No. 7, 9 or 10 angle of the frog is determined approximately bydividing 57%o degrees by the number of the get the number of a frog one of the following waysmay be used: 1. Take a short stick say six inches long, lay this on. Fig. 57. Conley All Rail Frog the heel of the frog where the spread of the frogequals the length of the stick; then from this pointmeasure with the stick to the theoretical point of thefrog; if it is seven times the length of the stick it willbe a number seven; if eight times, a number eight, etc. 2. Measure with a rule and find where the spreadis four inches; mark this point; then get where it isfive inches; also mark this; then the length in inchesfrom where it is four to five inches measured alongthe rail will be the number of the frog. 3. Add the spread between the gage lines at theheel to the spread at toe in inches and divide this intototal length of frog in inches; the result will be thenumber. FEOGS AND SWITCHES 267 4. Divide the spread between gage lines at the heelof frog in inches into length along the rail from heelto theoretical point in inches; result will be the num-ber. 5. Divide the spread between gage line
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