Gives a method for locating a given frog requiring only a few simple formulas for all the cases that ordinarily occur. (400 w.)
Formulas for locating frogs
R R Gaz
1899
Aufsatz (Zeitschrift)
Englisch
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Online Contents | 1997
|Engineering Index Backfile | 1928
|British Library Conference Proceedings | 1998
|Railroad track frogs and switches
Engineering Index Backfile | 1888
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