US1605979A - Ihstkumem jtob pbopobtiohal eraetiwg - Google Patents

Description

Nov. 9, 1 26. 1,605,979

s. PACKONR INSTRUMENT FOR PROPORTIONAL DRAFTING Filed 00%.. 26, 1925 C82 estL/zo Pwc zonl;

Patented Nov. 9, 1926.

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CELESTINO PACIQNI, OF CHICAGO, ILLINOIS.

IN$TBUMENT FOB FROIORTIONAL DRAFTING.

Application filed October 26, 1925.

This invention relates to means for ascertaining and ceptive surface,

describing on a suitable rethe outlines of. a remote object in substantially true relative dimensions and configuration.

The instrument is intended to serve as a gauge, adjustable to meet the exigencies presented, whereby visual imma-ginary sight lines, radiating from the human eye to the outlines of a remote object, are

located and noted where they pass thru a relatively small adpistable intervening aperture, by indications which define linear dimensions, lines representing which are on an accompanying surface 111 proportional measurement-s.

shown, and the mote object, th edgeis moved straight edge is ceiving suriace proportional in Figure 1 is a Fig. 4; is an Fig. 5 is an As shown on A plate or fr line. The smal Two angular enabled to outline on a canvass, or like receiving surface, true proportional lineations of distant objects, cations with respect to other objects.

The device is intended to be fixed in its upright position with its top edge level as openings, or apertures 11 and 12. openings are shown then transcribed up By this means, artists are other deand their observer is to look through the aperture at the boundary of some reen the appropriate straight over the aperture until one of its edges is in line with the line of vision, whereupon its positlon graduations bounding is indicated by the the aperture. The now to be moved over the reto position indicated by a corresponding unit of its graduation and a mark is then made along the used edge of the straight edge,

This operation is line of the observed remote object appears upon the receiving surface which will be on the receiving surface. repeated until the outsize and configuration.

On the drawings:

plate or frame Fig. 2 is a sectional view taken on line lI-1I of Figure 1;

Fig. 3 is a transverse section taken on line HI -III of Figure 1;

enlarged section taken on line IV1V of Figure 1; and

enlarged section taken on line VV of Figure 1..

the drawings: ame 10 is provided with two These to be rectangular in outler opening 11 is immediately above the central portion of the opening ly related margins, 13 and Serial No. 64.716.

1 1 of 12, are graduated near their edges in linear terms, as in inches and fractions thereof. Similar margins of the aperture 11 are in like manner graduated in corresponding terms in which thespaces indicated by the units are the same in number, but proportionately shorter. For example; if the aperture 11 be twenty-four wide and twenty-four inches long, the 1ndicia on the aperture 11 should read in the same number of, but shorter units. ,That is to say, the scales 13-13 and 14:44. should each. read in units from 1 to 24.

One side 15 of the frame is grooved, as at 16, from end to end. A T-shape cleat 17 is slidable in the groove and a spring18 frictionally holds the cleat in selected position.

A horizontal straight edge 19 is secured to the cleat 17 at 20. The straight edge may be moved vertically and held in any selected position by the spring 18. The straight edge 19 is also longitudinally grooved, at 21, within which another cleat 22 is slidable laterally of the frame and longitudinally of straight edge 19. A ver across the face of theapertures 11- and 12 on the straight edge 19. The straight edges 19 and 23 are maintained at all times in planes at right angles to each other. Centrally pivoted on the straight edge 28, as at 24, is a third straight edge 25 and is frictionally retained in any selected position.

A frame 26 is fixed in the opening or aperture 12 and bears a stretched canvas 27 or other suitable surface upon which to receive marks to be made thereon. The straight edge 25 when not in use may be placed parallel with straight edge 23.

The instrument when about to be used for its intended purpose is first mounted upon a fixed support.

The operator then looks at a remote object thru the smaller aperture 11. If the portion of the outline of said object is in a vertical plane the straight edge 28 is slid laterally overthe aperture 11 until its approaching edge is'brought into the line of vision and the observed portion of said object. Assume now that said front edge indicates 15 on scale 1 1 then the straight edge 23 is slid laterally until its front edge coincides with 15 on scale 14:, a mark is then inches this invention and I made on the surface 27, the straight edge serving as a pencil guide. Observations are then made adjacent the opposite edge of aperture 11 and a graph line made in 27 as before. Straight edge 19 is then moved over the aperture to secure the indications denoting the top and bottom measurement of the observed object and corresponding lines are made on the receiving surface 27. The straight edge 25 is used in the same manner to secure the position of outlines which may be located in various oblique planes. The edges of the straight edges, 19, 23 and 25 are cut ack, as shown at 28, to present a sharp front edge so that the rear part will not be interposed when 100 mg thru aperture 11 at an angle to its front face. In like manner the bounding edge of the aperture 11 is cut back, as at 29, for the same purpose.

am aware that many changes may bemade and numerous details of construction-may be varied through a wide range, without departing from the principles of i do not purpose-limiting the patent granted hereon, otherwise than necessitatedby the prior art.

Having described my invention, what I claim is:

1. In a device of the character described,

a flat plate to support a receiving surface and having a rectangular orifice, there belng graduations in linear terms near the margins of two' angularly related edges thereof, a" proportlonal rectangular receiving surface supported on said plate and located near said orifice there being graduations in linear terms near the margins of two angularly related edges of said surface and uniformly proportional to the graduations about said orifice; a vertically slidable straight edge movable over said orifice and said surface and a longitudinally slidable straight edge laterally movable over said orifice and said surface said straight edges serving as pencil guides and guiding means to hold said straight edges inpredetermined angular relation.

2. In a device of the character described, a flat plate to support a receiving surface and having a rectangular orifice, there being graduatiens in linear terms. near the mar gins of two angularly related edges thereof; a proportional rectangular receiving surface supported on said plate and located near said orifice, there being graduations in linear terms near the margins of two angularly re lated edges of proportional tothegraduations about said orifice; a vertically slidable straight edge movable over said orifice and'said surface and a longitudinally slidable straight'edge laterally movable over said orifice and said surface; guiding means to hold said straight edges in predetermined angular relation and a straight edge pivotally supported on the laterally movable straight edge.

In testimony whereof I have hereunto subscribed by name.

OELESTINO PACIONI.

said surface and uniformly

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