USD4693S - Design for a reflector - Google Patents

Description

AUGUST WILHELM, 0F PHILADELPHIA, PENNSYLVANIA.

Design No. 4,693, dated February 28, 1871.

DESIGN FOR A REFLECTOR.

The Schedule referred to in these Letters Patent and making part of the same.

T0 u whom it "my www" v A reeetor shaped as herein shown and described Be it known that I, AUGUST WILHELM, of the can be circular or polygonal,

cit-y of Philadelphia, in the county of Philadelphia and A number (iP-lights can be placed on the focus line State of Pennsylvanie, have invented and designed a new and original shape tornLght-Reflector for Lamps, The dotted lilies are merely illustrative of the inan- Sl'Bet-Lil'lltels, c., 0f Whll the follwllg iS it Clem ner of designing the reflecting-surface of the reector and exact description, reference being had to the ace b c b' c b' a b c, and oi' the resultnnt direction of the eompanying drawing Inakinga part of this description, reflected rays ot' light coming from the focus line fj',

and to the letters of reference marked thereon. :1nd therefore t'orin no part ot' the design; but

The drawing represents a vertical longitudinal sce- Having shown and described the particular sii-.ipe tion through the center of the said reflector. ofthe rel'lcctor, c b (t b' c' b' a 11 c,

The inside or reflecting-Surface of' the reileetor is What Ieiaim as my invention, and desire to secure coneavo-convex. by Letters Patent, is-

c b a c b a is the concave part of the reflector, and ',liic design for a reflector herein shown and deis formed of the convex curves c b c b, and of the conscribed, cave curves b a b a.

a b' c b' (l. is the convex part of the reflector, and is A UG US'I VJILHELM. formed of the concave curves (t b (L b', and ci' the. coni rex curves b c' b' c'. Witnesses:

Ihe concave curves b a a b b t a b' are elliptic, (iis'rm'us FnANni-i,

The convex curves c b c' b', c i c' b' are segments oi J. M. GOLGAX.

circles. i

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