US1156528A

US1156528A - Photographic-printing apparatus.

Info

Publication number: US1156528A
Application number: US4139615A
Authority: US
Inventors: Theodor Harbers
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-07-22
Filing date: 1915-07-22
Publication date: 1915-10-12
Anticipated expiration: 1932-10-12

Description

Patented Oct. 12, 1915.

aSTATES PATENT oFFIoE. f

A THEODOR HARBERS, OF LEIPZIG, AGERJYIANY.

i PHOTOGRAPHIC-PRINTING- APPARATUS.

u specification of Letters Patent. l l' Patented ct; 12,. 1915,

Application filled. June 26, 1913, Serial No. 775,922. Renewed Ju1y-22, 1915. Serial No. 41,396.

To all whom t may concern Be it known that I, THEODOR HAnnERs, a subject of the King of Saxony, reslding at i Machern 811", Bezirk Leipzig, Germany,

merchant, (whose post-office address is Machern 811",I Bezirk Leipzig, Germany,)

have invented certain new and useful Improvements in Photographic-Printing Apparatus, of which the following is a speciiication.

The'present invention has for its object an apparatus for copying photographic negatives.

Although the invention will greatly appeal to amateur photographers, it will also be -found useful by professionalphotographers, because owing to the small size and the simplicity of the appartus can readily be carried about. u

The invention is -applicable to quick copying papers, silver bromid, and gas-light papers, which permit of making the prints by artificial light.

The apparatus is illustrated in the accompanying drawing, iii which: Figure l is a perspective top view, Fig. 2 is a longitudinal section, and Fig. `,13 shows the lamp to a larger scale.

The apparatus consists of a box a containing a compartment?) in which an electric battery c is arranged.- Upon the bottom -of the main compartment of the box a an electric incandescent lamp al` is arranged;

-this lamp is electrically connected with the battery c, the connection being interrupted owing to the fact that one of the poles terminates in a metal plate e fixed to the edge ofthe box while the other terminal is formed by the spring pole piecef of the battery. When the two poles e and f are connected the circuit is closed and the lamp d lighted. This bridging of the poles e and fis effected by a metallic spring g secured tothe lid of the box a. The lid,which is hinged to one side v of thebox @,consists of two parts z. and z' whichare hinged together. In the box d A light-reflecting walls 7c are provided Which liso ' reception o may consist lof white' cardboard or the Vlike and may be composed of inclined ory curved surfaces. Upongthe upper edge of the box a a ground glass plate 'm is provided for the ground the negative Z.'When the lid tis entirely.- removed the sensitized paper is placed upon the'negativeand first of all retained by means of the rear portion I1.v of {theshid in such a manner' that it can be adjusted. The other part i of t e lid is thenv this opening it can be seen Whether the lamp d is alight.

In order to permit of closing the box without at the same time closing the electric circuit, the bridging or connecting spring g can beturned aside as indicated in broken lines` in Fig. l.

Notwithstanding the employment ofl a glass lamp bulb and the dispersion of the light by the reflecting walls, and also the ground glass plate, the'illumination of the negative and of the sensitized paper is l not perfectly uniform, as the middle portion receivesdirectl light, so that over-exposure might leasily occur there. Accordlngly provision is made that only -indirect light can fall upon the surface tofbe illuminated, that is to say of the lamp bulb d is. rovided with a screen orcovering a which revents direct radiation in the upward direction. Consequently the rays of lightlcan only reach the reflecting walls c which throw them on to the plate, whereby a perfectly uniform illumination of the negative is obtained. The top of the incandescent bulb may be covered with a coat ofblack'paint or the like 6r byfan appropriately shaped piece of paper or metal. I f desired the screen or coat may present reiiecting properties on its. side directed toward lthe lamp. I i C The 'apparatus that has been described is characterized by its simplicity, cheapness reected light. The top' an electric battery secured in saidbox', a circuit, a lamp. secured'to said box in` said circuit, a plvoted contact' bridge device are ran'gedin-said lid adapted to close -said cirlcuit when the lid lis fastened to place, reflecting platesarranged. in the box to reflect the rays onto, the negative, and a. screen o r cover on'the top ofthe lamp bulb to pre- .vent directrays from reaching the negative,

substantially as described.

5 cirouit,;a negative, a support therefor admy hand inpresence'of two subscribing witn 2. 'A photographic printing apparatus an opaque cover provided for said lamp comprising a box, a lid therefor, an electric serving to prevent direct rays from reachbattery contained in said box, a circuit, a ing the negative. l lamp secured in said box connected in Said In testimony whereof I have hereunto set jacent the lidof said box, a pivoted Contact nesses this 13th day of June 1913.

bridge device arranged upon the lid of the a THEODOR HARBERS. box, for completing the circuit When the lid Vitnesses: A, is closed, reeeting plates arranged in the RUDOLPH FRICKE,

v10 box to reflect the rays on the negative, and DAVIS KRAHL.