US146164A - Improvement in revolving stereoscopes - Google Patents

Description

i ing substance.

Un'rrnn STATES.

Pn'rniwr OFFICE.

JONATHAN YV. CADVELL, OF NORTH READING, MASSACHUSETTS.

IMPROVEMENT IN REVOLVING STEREOSCOPES. .i

Speciiicntion forming part of Letters Patent No. 146,l61, dated January 6,1824; apl lcaticn filed May 5, 1873. .i

To all 'whom it may concern:

Be it known that I, JONATHAN W. CAD- WELL, of North Reading, in the county of Mid dlesex and State of Massachusetts, have invented certain Improvements in Stereoscopes, of which. the following is a specification:

Figure l of the accompanying drawing is a central vertical longitudinal section, and Fig. 2 is a central vertical transverse section, of my improved stereoscope-case. Fig. 3 is a part in detail of the same.

This invention relates to that class of stereoscopes in which the views are pivoted to a revolving horizontal shaft in such manner as, when revolved, to successively expose each picture as it reaches a vertical position over the shaft, those in front falling by gravitation, so as to expose the entire surface of the view, which is held by a suitable spring-detent. My invention has for its object to provide a stereoscope in which a greater number of views shall be held upon a single shaft than is usually done, and yet allow sufficient fall of the views, after passing a vertical line through the shaft, to expose the entire surface of the succeeding view. `To this end it consists in the peculiar construction of the view holders or clamps, enabling them to lie closely together,.and their arrangement on a peculiarly-constructed shaft or roller, as I will now proceed to describe.

Inthe drawings, c represents a stereoscopecase, formed with suitable eye-pieces b b', arranged as usual, and provided on the top with hinged lids c, lined with tin-foil or other reflect- Within the case a, extending transversely, is a roller or axle, d, whose ends d are supported by and turn in the sides of the ease a. At each end of the roller d are attached two parallel plates or disks, e e', formed with a series of perforations, f, near the edge of the circumference, in which the ends of transverse rods g are held and allowed toturn. Between the parallel disks c c and el e are side flaps or clamps h h', that are bent at the bottom, so as to turn on and be held by the rods g', and form two outward-extending portions or arms. The back portion or arm of the iiaps is curved at the upper portion and rounded at the edge, as shown, to prevent the interference of one series of iiaps with the other in their rotation, and to receive the ends of stationary rods g, that connect the flaps on one side with the flaps on the opposite side," and extends horizontally across the top, and is rounded on the front edge, and formed with a downward-extending lip or catch, 71. that turns over and holds the top of the front portion or arm of the iiaps. On the top of the ilaps being raised, the catch is unloosed and the front arms released for the admission of the views, whose sides are held between the front and back portions or arms of the ilaps, from which the views are readily 4withdrawn by raising the tops of the flaps and releasing the lips or catches h from the front arms. The bottoms of the flaps h h' are formed at front and back with double-reversed curves, as shown in Fig. 3, so that the convex portion of one flap will impinge against the concave portion of the other iiapwhen together, and thus allow a greater number of iiaps to be connected with the plates e e', and permit of their rotation without the interference of one with the other. The roller d is provided with and operated by a suitable crank or knob, 7c, arranged' on one or both sides of the case a. Within the case a, on each side, at the top, is a bent rod or spring, l, held by a screw or stem, l. This rod or spring is only necessary for the use of transparent views, and is so bent or arranged as to allow the passage of the rods and views in one direction, and prevent their falling backward, so that when the desired Aview is brought properly in sight by the rotation of the axle cl it will be prevented, by the spring or rod l, from falling back.

The rods g may, if desired, be attached to the top of the iiaps h h' on the outside.

By my improvements, as shownV in the accompanying drawings, and as hereinabove described, it will readily be seen that a great number of iiaps for the reception of the views may be arranged within the case, requiring but a small space for their operation, thus enabling a smaller box than ordinary to be used; and as the several operative parts are simple and inexpensive in con struction and cost, the apparatus can be furnished at less expense than the larger and ordinarily-constructed stereoscopes of similar description. Moreover, by the arrangement and operation of the flaps IL h', as hereinabove described and shown, it will be seen that they arereadily operated without the interference of one series with the other; and that the views are readily adjusted and securely heldin or easily Withdrawn from the Haps and that the objections occasioned hitherto by the interfering and falling out of the views is obviated.

Having thus fully described my improvements, what I claim as my invention7 and de- .sire to have secured to me by Letters Patent7 1sl. In a stereoseope for revolving views7 the clamps 71l h pivoted to longitudinal rods g on a revolving axle, said clamps being adapted to fit snugly together at their inner ends by means of reverse curves or eorrugations7 sub- JONATHAN WI. CADVELI'.

Witnesses:

CARROLL D. VRIGHT, SAML, M. BARTON.

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