US968774A - Long-distance lighting. - Google Patents

Description

J. LAFITTE.

LONG DISTANCE LIGHTING.

APPLIOATION FILED JULY 25, 1908.

- 968,774. Patented Aug. 30,1910.

JOACHIM LAFITTE; or BL n ra;

LONG-DISTANCE LIGHTING: f

To all whom it may concern:

lle it known that I, JOACIIIM Larrrrn, a

citizen of the French Republic, and residing at Biarritz, France, have invented certain new and useful Improvements in Long-Distance Lighting, of which the following is a specification.

This invention relates to a system of intense lighting at long range by circular di pel'sion ofrays [emanating from a luminous focus which, compared to well known sys tems in which one or two luminous pencils are given varied movements for the purpose of dispersing the rays on the surface to be lighted, consists chiefly in a certain number of projectors or reflectors helically arranged on a rotary support about one and the same focus, so as to aflord free passage to the luminous pencils covering distinct zones, the shade intervals between these pencils being themselves covered by the dispersion of the rays brought into movement, a. uniform and constant lighting ofthe-surface covered by the apparatus being thus insured.

In the example illustrated, the invention is applied to a lamp post carrying an electric arc regulator, but it could also be applied in any case where any luminous focus, whetherelectric or of any other nature, is available.

In the accompanying drawing Figure 1 is a vertical elevation showing the chief arrangement of the system applied-to a construction of a lamp part with several reflecting mirrors having an arc lamp for ordinary public lighting. 2 shows the same arrangement in plan,

()n the top of the mast or pole at is arranged a recess 6 in which is mounted an electric motor a of suitable power. The armature c of the said motor is mounted in such manner that its core (Z should be able to rotate vertically and be supported by a. frame 6 through-which it passes with or without ball bearings, the latter frame 0 being made in one piece 'with the machine or independent of the same.

In the construction illustrated, the end of the core (Z of the armature of the dynamo, projecting beyond the frame 6, receives a. bracket comprising a suitable number of helically curved branches j which start from the central core (Z and terminate with their upper ends at a prefer. bly' circular support (7. The said branches could be constituted by ordinary curved or straight elements.

Specification of Letters Patent. Application filed Jing es" 190's. Serial No. 445,350.

(In the branches ing facespf which are toward-the ligh the axis of revolution, the: min i iug arranged side by side ahd-p'l' 1 ferent levels-relatively to each other an t the source of "light, whilethein-curvatu and distance from the latter may 'dilfer itcbe produced when cording to the effect to distributing the light. On electric current motor a, the or less quickly, carrying with it in that movement the reflectors which will then rotate about the focus in parallel planes.

When an electric motor is used in an apparatus using electricity for lighting, the motor might be in series with the apparatus, or supplied with electricity in any other manner.

being supplied to the mo'ii'hted a certain number, of reflectin amrrrors 1h; the refle armature ad will rotate more The arrangement of reflectors on their branches is such that the ra s of the luminous focus 2', reflected by eac of them, pass through the opposite correspondin interval comprised between two other re ectors, in the form of a cylindrical, or more or less conical, pencil in a special direction which may be difierent from that followed by the pencils of the other mirrors, or similar to it.

Taking into consideration: (1) the optical phenomena of the persistence of luminous influence on the eye which after having been subjected to the. action of a direct or reflected light, retains the impression for 1/10 of a second even after the luminous emission is interrupted; (2) the result produced by each reflector in directing the pencil rojected to a greater distance than that w would be reached by luminous rays without its use; (3) the to all the reflectors ,about the lumlnous focus,--it will be sufficient, therefore, in order that thespace and the objects situated in the said space in the neighborhood of the nently lighted, make a fraction of a revolution corresponding at leastto the number of branches,- in less time than the phenomena of luminous persistence lasts on the retina after the interruption of the lighting.

In the arrangement illustrated by way of example, the branches which are supposed to be three in number, are helically arranged for the purpose of affording a more convenient passage to the rays reflected by each lighting apparatus should appear perma-' that each reflector should ich' movement of revolution given source of light and at the same arrangement w 'c reflector, the S}%,%1efitting also by this which is liable to damage the insulating or fusible parts.

hat I claim as my invention and desire tosecure by Letters Patent is In a long distance lighting device, means for supporting a source of light, sevsupporting said series of reflectors tance therefrom for the purpose specified.

2. In a long distance lighting device, a standard having a sou-rceof light thereon, a rotary carrier, means upon said standard for rotating said carrier, arms upon said carrier extendmg helically about said source 1 of light, a series of mirrors arranged u on each of said arms and at the same focal istance from the source of light, for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

J OAOHIM LAFITTE.

Witnesses:

E Bonus, Eire. HERASSARY.

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