. American engineer and railroad journal . in have the sides of the right-angledtriangle A B = R + ig and AC = R + ig — gto findthe angle B A C, We now have Example : As an example, let there be given R = , g = ^ft. — 8i in. = and g = 3 ft. to find the frog angleL> B E^ BAC, hg. 5. R + i g —g = R + ig = B A C = s° A 31 ^■f- To find the frog angle of the third or double-pointedfrog, fig. 6. Again, we have the frog angle D B E equal to the cen-tral angle BAC. Here A B\% equal Ko R A- \ g — g and A C = R — \g. Then in the right-angled t
. American engineer and railroad journal . in have the sides of the right-angledtriangle A B = R + ig and AC = R + ig — gto findthe angle B A C, We now have Example : As an example, let there be given R = , g = ^ft. — 8i in. = and g = 3 ft. to find the frog angleL> B E^ BAC, hg. 5. R + i g —g = R + ig = B A C = s° A 31 ^■f- To find the frog angle of the third or double-pointedfrog, fig. 6. Again, we have the frog angle D B E equal to the cen-tral angle BAC. Here A B\% equal Ko R A- \ g — g and A C = R — \g. Then in the right-angled triangle A B C vie haveAB=R+ig — g and yl C =R — i g. from which ^^^^.- (4) Example : As in the last two examples given, let R = , g =4 ft. — 8+ in. = , and / = 3 ft. to find the frog angleV BE ^ BA C, fig. 6. R — ig = ji + i g — g =^ .ff/5t C= 3° 50 13 COS. To find the radius of the turnout curve : When the conditions are that it is desired to find the.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
