US34970A

US34970A - Improvement in camera-obscu ras

Info

Publication number: US34970A
Authority: US
Publication date: 1862-04-15
Anticipated expiration: 1879-04-15

Description

UNITED STATES PATENT OFFICE;

GEORGE E. KOLB, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN CAM ERA-OBSCURAS.

Specification forming part ofiLctters Patent No. 34,970, dated April 15, 1862.

To all whom it may concern:

Be it known that I, GEORGE E. KOLB, of Philadelphia, Pennsylvania, have invented an Improvement in (famera-Obseuras; and I do hereby declare the following to bc a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention consists of a box of any suitable form with a lens-tube on one side and an eye-tube on the opposite side, in combination with two reflectors arranged in respect to each other and t0 the said lensand eye tubes, substantially as described hereinafter, and the whole forininga compact, cheap, and convenient camera-obscnra, and one in which the objects reflected will appear to the observer the right side uppermost.

In order to enable others skilled in the artto make and use my invention, Iwill now proceed to describe its construction and operation."

On reference to the accompanying drawings, which form a part of this specification, Figure lisa vertical section of myimprovcd' eamcra-obscura; Fig. 2, a plan view.

A is a covered box orcase, the form of which admits of manymodifications, the interior being painted or otherwise blackened. To one side, and near the eoverof the box, is secured a circular flange O, in which the tube 13, with its lens 6, fits snugly, but so as to be readily adjusted. In the opposite side of the case is cut an oblong openingK, which is surrounded by the oblong tube K, the latter being placed; at such an angle that on looking through it the entire or nearly the entire surface of the bottom of the box is exposed to view. Opposite to the lens-tube B, and in the interior of the box, is the reflector F, which is placed at such an angle as will cause the rays of light which pass through the lease to be thrown into a second reflector G, the latter occupying such a position as to direct the rays of light onto a sheet of paper a, deposited on the bottom. of the I box. The left side-of the latter may have an opening covered by a hinged door a, so that access may be had to tlic interior when the reflectors require cleansing or adjusting, and

on the right-hand side of the box thcremaybe another opening of such a size and form as to admit the hand and part of the arm when the figure reflected on the paper has to be traced, this opening being furnished with a dark cloth, which, while it permits the free movement of the hands and wrist, excludes the object to be reflected, the observer being" seated on a chair at the rear of the box, the

object seen through the eye-tube appearing to the observer the right side up,owin ;to the use of the two reflectors. he latter, too, tend to reduce the focus, and consequently views covering a more extended area are presented on the paper than inordinary instruments of much larger size, in which one reflector only is used."

I claim as my invention and desireto secure by Letters Patent A box A of any suitable form with the lenstube 1 on one side and the eye-tube K on the opposite side, in combination with the two'retleetors G and E, arranged in respect to each other-and to the eye and lens tubes, substantially as and for the purpose herein set forth.

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

, e. F. KOLB. Witnesses:

HENRY HoWsoN, J OHN WHITE.