Track Formulae And Tables PDF Download

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...to connect DO is evident from inspection of the figure. It is obvious that the distance between each succeeding frog 2 P on the ladder will be---sin 2 F Problem 50. To locate the frogs on a ladder where the ladder makes three times the frog angle with the body tracks and where there is one frog on the ladder for each three body tracks. Refer to Fig. 53. The heavy dotted and solid lines represent the center lines of the tracks. The light dotted and solid lines represent the rails. A Y = center line of ladder; QS, IJ and DO = center lines of three body tracks to be connected with the ladder. AQ and EI = center lines of the connecting tracks. Extend OD to intersect AQ at and AY at B. YBO = 3 F, BCA =J.QCD = 2F, %BAC = i-CED = CDE = %IDO = F. AE = ED = M.--M Since it is necessary to calculate EC = = r, ' the most J 2 cos F x, = (M + C) g=-JVC, (4) From inspection of the figure the location of the frog in EI to connect DO is evident. The distance between each succeeding frog on the ladder is clearly--- r-n" Problem 51, Case 1. To connect a ladder track to the drill track where the ladder track makes twice the frog angle with the body tracks. In Fig. 54, the extension of BA forms the drill track. If the location of the first frog in the drill or No. 1 is fixed, measure NG from the point of frog to A. At A lay off the angle = F. Extend AC to intersect No. 3 and No. 4. The location of the frog from AC extended into No. 3 is obvious, as is the termination of the extended line of in track No. 4. Make AC = M. At lay off CQ, making the angle F with AC. Measure NG from on either CQ or AC extended to locate the frog into the ladder CQ. The remaining frogs in...