US98404A - Improvement in solar cameras - Google Patents

Description

datiert tant @anni @wie ISALAH PAXSON AND CHARLES vPAXSOY, OF NEW YORK, N. Y.

Letters .Patent No. 98,404, dated December 2S, 1869.

IMPROVEMENT IN SOLAR CAMERAS.

The Schedule referred to in thse Letters Patent and making part of the same.

Mun-

We, IsAIAH PAXsoN and CHARLES PAXsoN, ot the city of New lYork, in the county and State of New York, have invented certain Improvements in Solar Cameras, of which the following is 'a specification.

The nature of our invention consists, in the first place, in providing the' negative-bolder with springs for clasping the negative, in conjunctionwith clamping-strips, whereby a single holder is adapted to negatives of different sizes, thus obviating the necessity of having 'a Aholder for each size negative.

In the second place, it consists in the employmen of a bellowsinthe vignetting-device, whereby, by the expansion and contraction of the bellows, effected as hereinaiter-desc1ibed, the vignettinglens is adjusted altitudinally, to increase or diminish the size of the picture, as may be desired.

In the third place, it consists in combining and arranging vertical screw-rods with the printing-board, for elevating and-depressing the same, the said rods being provided with grooved wheelson their upper ends, around which an endless chain is placed, so that by pulling the chain in one direction, the said screw-rods are revolved simultaneously, and with equal velocities, for elevating Athe printing-board, or by pulling the chain in the opposite direction, depressing the same; hence the altitudinal adjustment of the board is conveniently and expeditiously effected, and with great precision.

In the fourth place, the invention consists in constructing the lower and large' part of the camera-box o t' a frame-workLand canvas stretched over the same. The canvas is painted so as to thoroughly fill up the openings, to prevent light passing through into the dark chamber. The object of this construction is to obviate the ditculty often experienced, in the cracking of the boards, on account of their great width, unless this part of the box is panelled, which increases the expense much beyond the canvasing. Another advantage resulting from this improved construction is, the box is much lighter than when made altogether of boards.

.Lo enable others skilled in the art to which our improvement appertains, to apply the same to practice, we will now proceed to give a detailed description thereof'.

In the accompanying' dra-wings, which make a part of this specitcation- Figure 1 is a plan view of the improved camera.

Figure 2 is a vertical section of thc same, at the dotted line a b ofiig. 1.

Figure 3 is an isometrical view of the vignettingdevice, in a reversed position.

Figure 4 is a like view of the negative-holder, O, and parts in connection therewith.

on the pins e' c,

Like letters in all the iigures indicate the same parts.

A is the camera-box, which is made in the usual manner, with the exception of the bottom part, A.

I make this part of'a frame, a, and canvas b, which is stretched over it, on account of its great width, which involves the danger of cracks', which let the light into the dark chamber B, when this enlarged part is made of boards.

Sometimes, to overcome the difficulty experienced in the cracking of such Wide boards by their shrinkage, resort is had to panelling this large part of the box, but this involves an' increase of expense much above that incidental to my mode of construction.

After the canvas is stretched around the frame and on the bottom, and properly confined with tacks, or otherwise, I thoroughly paint it, to prevent light striking through it into the dark chamber B.

The printing-board C is supported and adjusted at any desired altitude, by means of the vertical screwrods D D D D, as more clearly seen in iig. l.

The rods work in nuts c, that are contined to the lower side ot" the board by means ot' screws.

There are grooved wheels, E E E E, on the upper ends of' the saidv rods, which receive the endless chain F.

The small grooved pulleys, G G G G, areused to cause the chain to hug around the wheels E, an i'n-y creased distance. Y

The chain F is manipulated by hand, and is pulled in the direction of thearrow, when the board C is to have an upward movement,`and 'contrariwise when it is to be lowered.

This mode oi' adjusting the board C admit-s of its being lowered further than in the usual mode of adjustment, and much more expeditiously, and with greater accuracy. v

H is a'vignettlngdevice, shown in detail in iig. 3, the device being inverted.

The bellows I is confined at its end, l, to the board J, and the end, 2, to the frame K, which has grooves d (l, which support the lenseholder L.

The lensin the holder L is elevated or depressed, as may be required by the contraction or expansion of the bellows I, which is' eected by means of the hinged strips M M and M M', the two former partially turning at their inner ends on the pins e e, which project from the vertical plate N, `or flange of the frame K; the inner ends ot' the strips M M' turning which project from the blockf, on the under side ot' the board J, and the outer end of the strips being connected by means of the pins e" c". Any other convenient mode may be adopt-ed for operating the bellows, if desired. Y

O is a negative-holder, which is adapted to negatives of various sizes, by being lprovided with the clamping-springs P P, as seen in figs. 1 and 4.

The negative, Q, is supported by the rebated strips R-R, which rest on the slide S.

The resilient parte, g, of the springs bearagainst the said strips, or eise against the intermediate strips h h, any desirable number of which maybe nsedwhen required to ll up between the springs and the strips R R, or the strips h to be kept on -hand for filling in, may be of various thicknesses, for convenience in the adjustment.

Indiafrubber or other springs may be used, when desired, instead of the springs P P, as represented in the drawings. I

What we iaim as our invention, and desire to secure by' Letters Patent, is-

conjointly, as and for the purpose specified.

In testimony that the above is our invention, we have hereunto set our hands and afiixed'ourseais, this 2d day of October, 1869. v

ISAIAH PAXSON. [15. s] CHAS. PAXSON. [In 3.]

Witnesses:

WARREN W. HALLOCK, STEPHEN UsTrcK.

rods having wheels E on their upper ends, which',` have the endless chain F in connection, all operating

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