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 |
| 3995221 | Flame responsive system A flame responsive system includes a flame sensor, flame signal generating circuitry responsive to the flame sensor and flame signal inhibiting circuitry also responsive to the flame sensor. A fast filter and a slower filter are coordinated so that total ... | 11/30/1976 |
| 3983548 | Fire detection system A fire detection system of the type utilizing an optical detector with discriminating photo-cells connected in series to form a voltage divider, with the rise in voltage at the junction of the photo-cells being utilized at the input to an amplifier to ene... | 09/28/1976 |
| 3967255 | Flame detection system A flame detection system comprising two light responsive photovoltaic photocell sensors in combination with corresponding light filters, a photovoltaic sensing amplifier, a control amplifier, and a power source. The photocell/filter combinations are respo... | 06/29/1976 |
| 3947218 | Safety circuit for monitoring a flickering flame An electronic network for safe operation of an infrared flame flicker burner control system is disclosed. The network is placed across the infrared flame detector and modifies the detector's action in the event of a flameout so that a refractory shimmer e... | 03/30/1976 |
| 3947219 | Burner control with interrupted ignition An interrupted ignition system for a burner control circuit having a primary side which has as its primary function the application of a line voltage to a burner motor and a fuel igniter and a secondary side, which is responsive to a thermostat, and inclu... | 03/30/1976 |
| 3943499 | Portable fire detector A portable fire alarm device comprising fire detecting means and alarm means powered from a self-contained power supply. The power to the detector and alarm is through a normally closed switch of the type such as a mercury switch which may be opened by ti... | 03/09/1976 |
| 3940753 | Detection of presence or absence of flames At least two photoelectric sensors, sensitive to different spectral ranges of incident light, provide two sensed output signals; the relationship of the a-c components of the sensed output signals is evaluated, and it is determined if these a-c components... | 02/24/1976 |
| 3936648 | Flame monitoring apparatus A filter having a cut-off frequency of the order of 50Hz is included in the circuit of flame monitoring apparatus to remove signals below the cut-off frequency. In the circuit shown, a silicon p-n junction photo-electric pick-up is capacitively connected ... | 02/03/1976 |
