Published Resources Details Letters Patent
- Machinery for propelling vessels
- United States Patent Office, 3062
Specification forming part of Letters Patent No. 888,390. Application filed April 23 1907.
"The present invention refers to an improvement in machinery for propelling vessels provided with two co-axially arranged propellers, rotating in opposite directions. The object of the invention is to neutralize reaction forces, which would tend to rotate the vessel itself around its longitudinal axis."