MACHINERY IN BRIDGE ERECTION 339 also carries the receivers, and an auto- The handle was provided with an open- matic device is provided to stop the ing and valve for the admission of the motor when the pressure has reached air. The pneumatic chipping hammer the required point and to start it again… … A TYPICAL AMERICAN BRIDGE ERECTING ENGINE. BUILT BY THE LIDGERWOOD MFG. CO., NEW YORK chipping must be done in the field, pny- stone cutting, and consisted of a cyl- vided there is a compressed air plant on inder enclosing a piston which, upon the work. While it cannot be worked the admission of…
Engineering
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