An Improved ``Zero-Resistance'' Circuit for Photo-Cell Photometry

Projector, Theodore H.; Laufer, Maurice K.; Douglas, C A

doi:10.1063/1.1770239

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…This circuit is shown in figure 11.2.3-2. However, when greater precision is required in the measurements, or when the illumination of the face of the photocell is either very large or very small, a "zero resistance" circuit is employed, and intensity measurements are made using a Kohirausch potentiometer (Barbrow, 1940;Projector, Laufer, and Douglas, 1944).…”

Section: Barrier Layer Photocellmentioning

confidence: 99%

Emergency vehicle warning lights :

Howett¹,

Kelly²,

Pierce³

1978

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or flashing blue-in Illinois, this is for Chicago only; three permit rotating or flashing blue; two permit flashing blue; one permits alternately flashing blue and six permit blue lights, but do not specify the type of light. One state permits red and blue oscillating, rotating or flashing lights.Eight states permit red lights on police vehicles: Three permit oscillating, rotating or flashing red; one permits flashing or rotating red; one permits flashing red; one permits rotating red; one permits alternating, flashing or blinking red and one permits a red signal lamp, but does not specify the type of light. One state permits police vehicles to have an oscillating, rotating or flashing red and white light."Six states permit blue lights on certain fire department vehicles: three permit flashing blue; one permits flashing or rotating blue; one permits alternately flashing blue and one state permits a blue light on the vehicles of fire chiefs and marshals, but does not specify the type of light. Eighteen states permit red lights on fire department vehicles: four permit oscillating, flashing or rotating red; two permit rotating or flashing red; one permits alternating, flashing or blinking red; seven permit flashing red-one state limits this to fire police and one state to fire captains; one permits alternately flashing red and three states permit red lights, but do not specify the type. Two states permit oscillating, rotating or flashing white lights and one state permits rotating or flashing white lights. One state permits oscillating, rotating or flashing red and white lights and one state permits rotating red and white lights."One state permits alternately flashing blue lights on ambulances. Eleven states permit red lights on ambulances: three permit oscillating, rotating or flashing red; two permit rotating or flashing red; one permits alternating, flashing or blinking red; two permit flashing red and three permit red lights, but do not specify the type of light. Three states permit oscillating, rotating or flashing white lights. Two states permit oscillating, rotating or flashing red and white lights, but one statute applies to local ambulances only."New Hampshire requires emergency lights on police, fire and rescue vehicles, but authorizes the commissioner to establish the type of light."Thirty-nine states have a provision comparable to UVC §12-227(b), prohibiting the use of a red light visible to the front, except on certain vehicles. Four of the 39 also prohibit blue lights; three also prohibit green lights (as did early editions of the Code) and one state prohibits the use of any colored lamp. In addition to these 39 states, one state provides expressly that only white, yellow or amber light may be shown to the front, except on certain vehicles. Similarly, one state permits only white or amber and one state permits only white or yellow lights."It should be noted that "authorized emergency vehicles," as defined in the Uniform Vehicle Code, include in general (unless otherwise defined by the State) only publi...

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Section: Barrier Layer Photocellmentioning

confidence: 99%