Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 5244005 | Device for causing a drop in the pressure of high pressure oil controlling admission valves of a turbine in the event of excess speed A device for causing a drop in the pressure of high pressure oil controlling admission valves of a steam turbine in the event of excess speed, the device comprising a speed trip (2) constrained to rotate with the shaft (1) of the turbine and fed downstrea... | 09/14/1993 |
| 4164234 | Metering device An arrangement for metering a blast of air delivered to a driven machine, particularly a sheet separation device of a sheet feeder. A control slide is connected via an air intake opening to a pressure source, and the control slide has an air discharge ope... | 08/14/1979 |
| 4157167 | Valve actuator and pilot assembly therefor A valve actuator and a pilot assembly responsive to control fluid pressure for moving an operative means of a valve. The actuator has a housing defining a cylindrical bore therethrough and a shaft is carried in the housing which is engagable with the oper... | 06/05/1979 |
| 4136658 | Speed sensitive pressure regulator system A speed sensitive pressure regulator system includes a diaphragm of resilient flexible material positioned within a housing and forming an actuating chamber therein. A valve is associated with a passage and is movable between a first position at which flu... | 01/30/1979 |
| 4082103 | Centrifugal force hydraulic governor Hydraulic governor having two centrifugal force controlled valves connected to a transmission output shaft. A relay valve is attached to the transmission case and connected hydraulically to the governor. Line pressure fluid supplied to the relay valve is ... | 04/04/1978 |
| 3976389 | Pressurized gas engine A pressure gas engine in which pressurized gas such as air is supplied to a series of arcuately arranged nozzles for exhausting into a series of arcuately arranged impulse buckets thereby causing rotation of a rotor in which the buckets are located, each ... | 08/24/1976 |
| 3945199 | Flyweight speed sensor A load on the flyweight transmitted through the pilot valve to preload the thrust bearings of a speed sensor serves to prevent the fuel control for a turbine type of power plant from shifting to its emergency schedule from the starting or normal schedule ... | 03/23/1976 |
