Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 4691514 | Water engine A water engine comprises two floats arranged to reciprocate vertically in respective water chambers. Water is admitted to each chamber in turn from a head of water and then allowed to exhaust to a lower level, thereby causing the floats to rise and fall. ... | 09/08/1987 |
| 4586333 | Water engine A water engine comprises a float arranged for reciprocal movement in a chamber under the action of a head of water. The chamber is filled with water from an upper level by means of a valve and is emptied to a lower level by means of a further valve. A cro... | 05/06/1986 |
| 4465941 | Water engine A water engine has a barrage with a differential head of water on an upstream and downstream side. The engine has a working chamber and a double acting piston member in the chamber. Valves admit water into the working chamber from the upstream side of the... | 08/14/1984 |
