US1319820A

US1319820A - Method of making pictures for projection upon screens

Info

Publication number: US1319820A
Authority: US
Publication date: 1919-10-28
Anticipated expiration: 1936-10-28

Description

UNITED sTATEs PATENT oEEIc-E.

DAVID J. WILLIAMS, 0F DETROIT, MICHIGAN, ASSIGNOR 0F ONE-HALF TO TOM DAVIS OF DETROIT, MICHIGAN.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application led May 2, 1919. Serial No. 294,261.

To all whom t may concern l Be it known that I, DAVIDJ. WILLIAMS, citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Methods of Making Pictures for Projection Upon Screens, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make'and use the same, reference being had to the accompanyin drawings, which form a part of this specication.

My invention relates to a method of making pictures, sketches or delineations for projection upon a screen bymeans of a lantern asthe drawing is executed.

The object of this invention is to provide means whereby a person unskilled as an artist may produce a slowly growing picture in such fashion as to simulate the work of one highly skilled with the pencil or brush. Such object is accomplished in the present process by the placing in a suitable projecting apparatus between thesource of light' and the projecting lens, of a previously prepared design or drawing upon a transparent medium and the super-position on this design or drawing of a plate covered with a coating which will transmit suicient light to enable the operator to see the lines of the design or drawing, but yet be suiliciently opaque to prevent the projection of the design upon the screen. The operator then removes certain portions of the coating, for instance, the parts approximately above the lines of the design and thus permits the light to be transmitted through the opaque coating and projected upon the screen, showing the design or drawing in the rocess of production. The removal of tire coating at these parts is readily accomplished by means of a suitable stylus'or other instrument.

In the drawings'accompanying this specicationz- 'Figure 1 is a longitudinal vertical sectional view of a projecting machine or lantern, showing the hand of an operator delineating upon a plate or slide coated with an opaque base, a picture for projection upon a screen. 1

Fig. 2 is a fragmentary perspective view of a transparent Aplate von which a finished drawing is displayed, also an overlapping:

plate coated With a relatively opaque substance adapted to be scratched away to expose the clear glass on which said opaque coating is spread.

Fig. 3 is an elevation of a screen showing the slowly growing picture being projected thereon.

Fig. 4f is -a cross-sectional View through the plate covered with the opaque substance, also the plate on which the drawing to be copied is shown.

Referring now to the letters of reference placed upon the drawings A, denotes a suitable projecting lantern; B, its lamp; C, a lens; D, a refiector or mirror; E, another lens.

F, indicates an adjustable lens spaced from the lens E, and G is an adjustable mirror or reflector for projecting a picture from a slide placed between the lenses E, and F, on to a screen.

The construction and operation of the foregoing apparatus is well understood in the art and requires no detailed description here;-it has been shown however that a clearer understanding may be had of my invention and the manner in which the same is employed.

H, indicates a transparent plate on which has been drawn a picture or other delineation desired to be reproduced. I', denotes a superimposed plate, also transparent, on

translucent coating J, such as plaster of Paris or the like, which may be readily scratched off by means of a steel stylus or other suitable tool K, adapted for the purpose,-leav ing the plate I, clear and transparent for the passage of light wherever the opaque coatin h-as been removed. v

ow in putting my invention into. effect,

the plates H, and I, are 'iirst placed between light `throu h the plate 'and on-tothe'screenj. j

as indicate in Figs. 2 and 3.

which is coated a substantially opaque or The effect will. be a, slow gft-wing, pi. j

ture upon the screen which may be thus produced without employing a skilled artist to draw the picture.

Thus the smaller theaters may present pictures of this character Who would not otherwise be ablel to do so on account of the expense of securing the required talent. The operator may also gradually remove the light excluding coating from the super-imposed plate permitting the outline drawing on the plate below to be projected upon the screen as the light excluding coating on the plate above is slowly removed.

Having thus described my invention what I claim is 1. The method of projecting pictures which consists in copying a picture, executed on a transparent medium, upon a super-imposed transparent medium covered -with a coating sufficiently opaque to prevent projection of the picture, but transmitting suiiicient light to enable the lines of the picture to be observed by the operator, by tracing said picture upon said last named medium by means or" an instrument adapted to remove said coating, allowing -a light to shine upon said iedium, whereby as the coating is removed, a slow growing picture appears upon a screen.

2. The method of projecting pictures which consists in copying a picture, executed on a transparent medium, upon a super-imposed transparent medium covered With a coating sufiiciently opaque to prevent projection of the picture, but transmitting sufficient light to enable the lines of the picture to be observed by the operator, by tra'cing said picture upon said last named medium by means of an instrument adapted to remove said coating, following the lines of said picture, allowing a light to shine upon said medium, whereby as the coating is removed, a slow growing picture appears upon a screen.

3. The method of projecting pictures which consists in providing a picture executed on a transparent medium, super-imposing a transparent medium covered with a coating sufficiently opaque to prevent projection of the picture While permitting the operator to observe the lines of the picture therethrough, gradually removing said excluding coating by means of suitable instrument allowing the light to shine through said medium, whereby a slow growing picture appears upon a screen.

4f. The method of projecting slowly growing pictures which consists in placing between the light and projecting lens of a suitable projection apparatus, a transparent medium having thereon a suitable design or picture, superposing on this first medium another transparent medium covered with a thin coat of plaster of Paris, and tracing the design in the plaster of Paris coating ywith a suitable instrument, whereby the light is permitted to be transmitted through the two mediums and the design projected upon a suitable screen;

In testimony whereof I sign this specilication in the presence of two witnesses.

DAVID J. WILLIAMS.

S. E. THOMAS, FRANK A. MARTIN.