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Publication numberUS860451 A
Publication typeGrant
Publication dateJul 16, 1907
Filing dateDec 29, 1906
Priority dateDec 29, 1906
Publication numberUS 860451 A, US 860451A, US-A-860451, US860451 A, US860451A
InventorsEdward P Donnelly
Original AssigneeEdward P Donnelly
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fog signaling device.
US 860451 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


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Specification of Letters r atent.

Patented Jul 16. 1907.

i Application filed December 29, 1906. Boris-1N0. 850,089.

To all whom it may concern:

Be it known that I, EDWARD P. DONNELLY, a citizen of the United States, residing at Manchester, in the county of Hillsboro and State of New Hampshire, have invented new and useful Improvements in Fog Signaling Devices, of which the following is a specification.

It is a well known fact that the employment of lights as fog signals is impractical, and this for the reason that the most powerful lamps are inadequate for effectively projecting light rays through fog, which latter absorbs and dissipates the light rays, thereby destroying their penetrating effect. Therefore it is customary to rely upon horns or bells for use as fog signals, these audible signals being objectionable owing to the difficulty with which they are located and for other reasons.

' This invention relates to fog signaling devices of the visual type and embodies essentially a lamp or other light producer and a reflector disposed within the path of the rays emanating from said producer and having a dull-finished golden surface onto which the light is directed and by which the rays are partially diffused and vprojected en 'massje in the form of an intensified body of light.

, The invention has for its objects to provide a comd paratively simple, inexpensive device of this character comprises the novel features of constructionand combination of parts more fully hereinafter described. v In the accompanying drawings: Figure 1 is a view ;of a portion of a marine vessel equipped with a signaling apparatus embodying the invention. Fig. 2 is a detail view in side elevation of the reflector.

Referring to the drawings, 1 designates a vessel on which is installed the improved signaling apparatus comprising a light producer 2 and a reflector 3, preferably sustained at an elevation on a mast or other support 4and arranged in advance of and to catch the light rays emanating from the producer 2, which is by prefcrencein the form of a searchlight pivotally mounted in a support 5 near the bow of the vessel and focused for directing a strong, intensified light directly onto the active face of the reflector.

The reflector, which may be of any appropriate form, embodies, in accordance with the invention, a base plate 6 having attached to its rearface a clip 7 pivoted by means of pintles or bolts 8 to an attaching member 9 in the form of a clamp bracket and designed to securely embrace the mast 4 for sustaining the reflector in position thereon, there being attached to the frontface of the plate 6 an active surface plate 10 of disk-like form composed of pure or virgin gold having a dull-finished reflecting surface. It may be mentioned in this connection that while I have herein shown the active face of the reflector as being in the form of a plate attached to the base plate 6 it is to be understood that like results may be attained by heavily plating the front face of the base plate with gold to form the reflecting surface.

In practice, the intensified light radiated by the lamp or producer 2 is directed or focused onto the active dull-finished face of the disk 9 which catches and partially absorbs or diffuses the rays, thereby projecting the light en masse in a diffused condition from the active gold surface of the reflector. The dull-finished golden surface of the reflector will, under the action of the artificial light directed thereon, glow intensely and throw off or project a strong, lunar-like light having a powerful luminatingproperty and a peculiar fog penetrating quality requisitefor penetrating the densest fog, and this toan extent to renderthe luminous disk visible at a sufficiently long distance through the fog to render .the signal effective. It may be mentioned in this connection that I have discovered through actual; practical tests that dull-finished golden metal is the only material adapted for use in the formation of the active reflecting surface of the signaling disk, this being due, as I believe, to a peculiar property of. the metal in question when so finished, which causes the same in action to partially absorb and diffuse the light rays, as heretofore explained, and project this partially absorbed light in a diffused condition resulting in the projected light having a peculiar penetrating effect upon fogand causing the face of the disk to glow with a lunar-like radiance. Therefore, as it is essential to form the active surface of the reflector of a dul1- finished golden metal, it is' to be understood that the apparatus is restricted to this feature and that I do not seekto cover a reflecting disk'the surface of which is made ofia different metalor material, as it has been demonstrated that reflectors having polished surfaces or surfaces which are not of a golden nature act to throw off or reflect light in the form of rays, as distinguished from projecting the light in a partially diffused,

rayless condition, thus rendering the device ineffective as a fog signal, and this for the reason, as before stated, that the light when reflected in the form of rays is sub- A fog signaling apparatus comprising a light producer adapted for radiating light rays and a reflector arranged .at a point remote from and in advance of theproducer within the path of the rays emanating therefrom, said re-vv flector having a dull-finished golden active surface adapted to partially absorb anddiifusethe light rays, thus to pro ject through the fog an intensified body of light.

In testimony whereof, I aflix my signature in presence of two witnesses.


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US5647661 *Jan 20, 1995Jul 15, 1997Musco CorporationHigh efficiency, highly controllable lighting apparatus and method
US5906425 *Jan 20, 1997May 25, 1999Musco CorporationMeans and method for highly controllable lighting of areas or objects
Cooperative ClassificationF21V9/10