US1517742A - Combined photographic enlarging lantern and printing machine - Google Patents

Description

M De 2, 1924. 1,517,742

J. c. MARTIN COMBINED PHOTOGRAPHIC ENLARGING LANTERN AND PRINTING MACHINE Filed July 5, 1923 gwuemtoc I 3 I J a 447m),

v 61cm new Patented Dec. 2, 1924.

UNITED STATES PATENT OFFICE.

JOHN C. MARTIN, OF CAMERON, TEXAS.

COMBINE) PHOTOGRAPHIG ENLARGING LANTERN AND PRINTING MACHINE. A

Application filed July 5,

To all whom it may concern: Be it known that JOHN C. MARTIN, a citizen of the United States, residing at Cameron, in the county of Milam and State of Texas, has invented certain new and useful Improvements in Combined Photographic Enlarging Lanterns and Printing Machines, of which the following is a specification.

This invention has reference to combined photographic. enlarging lantern and printing machine and its object is to provide for an even illumination of an image receiving light from electric lamps with the light reflected upon curved surfaces located in the corners of the instrument while provision is made for an equitable distribution of light from electric lamps to the image to be copied. This is accomplished by providing an enclosure housed by a box having curved rear corners so that light from lamps pro-' duce a perfectly even light on all parts of the negative for illuminating the same for use both as an enlarging lantern and as a printing machine.

In order to produce ample illumination with the light evenly distributed, while cardboard or other such surface is used throughout the entire box, but other reflecting or refracting means is used instead of the structures illuminated if so desired.

The advantages of the enlargin lantern and printing machine comprise c e'apness of construction, evenness of illumination and simplicity of use, the owner of the device requiring only the ownership of a camera that has a removable back in order to make enlargements on it from five by seven negatives down to the smallest size and enlargements limited only by clearnem of the negative and the size of the available enlarging paper.

Experience has taught that work can be done equally as well and much more clearly on the machine of the invention than with many complicated machines now selling for several times the cost of one made in accordance-with the invention. There are no mechanical parts to become troublesome or out of order. The device can be used as a erfect printing machine as well as an enarger and moreover it is a rapid printer. Though small in size it may be employed to produce large copies.

The invention will be best understood from a consideration of the following 1923. Serial No. 649,511

Figure 2 is a plan view of the structure shown in Figure 1;

Figure 3 is an elevation showing the interior of the box with the back removed;

Figure 4 is a section on the line 4.-4 of Figure 1;

Figure 5 is a section on the line 55 of Figure l; and

Figure 6 is a left-hand view of the struc- 'ture shown in Figure 5.

7 to be retracted toward the central portion of the casing 1. The electric lamps 8 receive their energy through a conductor 9 connected to any suitable source of current.

The bottom 3 of the casing is connected to the front portion 4 by hinges 10 so that this portion 4 may be swung about the hinges 10 to expose the interior of the casing for access thereto.

Through the section 4 there is provided a passage 11 having borders 12 through the passageway 13, arranged atthe front or top through which light is reflected to illuminate a negative.

Ordinarily in other enlarging lanterns either direct lighting and lamps placed directly behind the negative with a mirror or other reflector is used or condensing lens placed in front of the light and directly behind the negative employed. In this machine both the reflector and the condensing lens are disposed with the light being entirely reflected light and on account of the construction of curved rear corners and the placing of the lights give a perfectly even light on all parts of the negatives.

" In the structure forming the subject of this invention white card-board or other suitable material is used for the enlarging lantern and the printing machine, such white cardboard or other suitable white material is used on the under surface of the top 1 while on the under surface of the box and the upright surface thereof as well as the fiat surface on the back of the box, thus producing an indirect reflected lighting both for enlarging and adapt the structure as a printing machine. Of course, other refracting or reflecting substances, reflecting paints or surfacings may be used.

As a printing machine the structure is laid flat on the back and the rinting frame 14 has a negative holder. en a negative is being copied it is held in the negative holder 14 at the bottom and secured by a button 15 in position over the passageway 11. \Vhen the part to be copied is located in the box 1 and the lights 6 are energized these lights are reflected against the curved surface 7 and from thence through the negative or other part to be copied and out through the opening 11 to be impressed upon a sensitive surface through the 0 ening 11 whether such sensitive surface a sensitized plate or sensitized paper on which the enlargement is to be made.

What is claimed is:

A photograph enlarging lantern comprising a casing having continuous side and rear walls, the rear wall having an intermediate-plane surface which extends from the upper to the lower edge of the said wall and which is disposed at a right angle to the inner surfaces of the side walls, the said rectangularly disposed surfaces being connected together by arcuate surfaces which extend from the upper to the lower edges of the rear and side walls, top and bottom walls'for the casing having inner surfaces disposed in planes at right angles to the plane in which the intermediate surface of the rear wall lies, a. detachable wall for the casing having an opening disposed opposite the plane surface of the rear wall, and lamp bulbs located within the casing and having their filaments disposed approximately parallel with the curved surfaces which merge with the plane surfaces of the side and rear walls.

In testimony whereof I aflix my signature.

JOHN C. MARTIN.

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