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The Optical Magic Lantern Journal and Photographic Enlarger. 89
Reference to the accompanying drawing shews one method of arrangement of the plates and the positions they assume. In the sectional elevation shewn A. A. is the box or case for containing and holding the glass plates C. C. B. B. are strips of metal or suitable material attached to the glass plates in order to give same different angles in same plane. OC.C. are the glass plates seen on edge in position in the box or case A. A. D. is the lens of objective of lantern, into which the case of glass plates is introduced. E.E. diaphragm.
The following is the claim made in the patent specification, No. 11,520, 1891: The scientific arrangement of the several parts constituting an apparatus for giving, ty polarization or partial polarization of the light, a stereoscopic effect to pictures and such like projected upon a screen or elsewhere, and forming thereby a method or system by means of which such pictures or other objects being so projected from an optical or magic lantern or lanterns are seen in relief substantially as herein more fully set forth and described.
Hand-Cameras for Obtaining Slides for the Lantern.
“ Pacile” .. (Fallowfield) .. sce March 1st,1890 No. 1 “Giob” .. .. (Mawson & Swan) -4,May Ist, ,, » 2 Quadrant" .. (W.H.Humphries&Co.) ,, June Ist, ,, » 3 “ Beclipse" . (J. F. Shew &Co.).. .. 4, July Ast, ,, » 4 “Furcka” . (W. W. Rouch & Co.) .. ,, Aug. Ist, ,, » 5 “Key” ., .. (Platinotype Co.) .. .. ., Sept. Ist, ,, » 6 “Optimus” .. (Perken, Son« Rayment) ,, Oct, Ist, ,, vy 7VThe Griffin" (Griffin & Sons, Limited) ,, Nov. Ist, ,, » 8 “The Swinden-Karp” Patent .. .. .. ,, Dec. Ist, ., » 9 “Collins” -. (C.G. Collins)... .. .. 4, Feb. Ist, 1691. , 10 Kedak” .. (Hastman Co,).. .. .. 4, Mar. Ast, ,, , 11 Guinen’ .. (Walter Griffith) . , April Ist, ,, », 12 “Vanneck” .. (Watson & Sons) .. .. ,, May Ist, ,. » 13 “Chadwicks” (W.1I. Chadwick) .. » June Ist, ., n» 14‘ Bonanza” .. (R.& A J. Mercer) .. » July Ist, ,, » 16 “Repeater” .. (J. FP. Shew&Co.).. .. 4, Aug. Ist. ,, » 16 Marvel” .. (Wilson & Son)... .. .. 4, Sept. Ist. ,, », 17 “Talmer” -. (Talbot & Eamer) .. .. .. Oct. Ist, ,, » 18 “ The Omnigraph” (J. Lancaster & Son) ,, Nov. Ist, ,,
» 19 “Ubique .. .. (Perken,Son &Rayment) ,, May Ist, 1892.
» 20 “Daylight Kodak ” (lastman Company) » 21 “The Radial’ (Marion & Co.) F
» June Ist, ,, y July Ist, ,,
No. 22 ‘‘SURPRISE.”
‘THE changing mechanism of this }-plate hand camera is entirely different from any we have hitherto seen. The plates are arranged in triangular form, the bases of which are turned as desired to face the lens. Had the plates been placed on fixed bases this would have limited one charge of plates to three only, but the patentees (‘‘ Leviathan,’’ London) here adopt an ingeneous mode of doubling the number of plates contained in the camera; this if effected by making each base of the triangle alluded to, revolve, and as one plate is fastened at either
side, six plates can be easily brought in succession to the focussing plane.
The foregoing states the general principle upon which this camera is constructed. In order to charge the camera, it is necessary to slightly withdraw the sliding lid on top—a couple of inches is quite sufficient—when the groves of a plate carrier will be seen. A plate
having been dropped into these, a small handle at the other side of camera is turned, which
causes the side of the triangle or revolving prism to be turned round. The loaded carrier is now inside of the triangle, and another plate may be placed in the cairicr now presented, after which the second side of the revolving prism is presented infront of the lens, by the movement of alever. ‘he second set having been loaded in like manner, the lever is again moved and the third side charged.
We start with the camera charged, and having made the first exposure, it becomes necessary to bring another plate into position. The button C, which is presented at a small hole in the camera, is turned round, this changes the side of the prisin and presents the second plate to the lens.
When it is required to bring the sccond and third pair of plates into position, a lever working under the camera is turned until a catch with which it is provided engages in a slot. An automatic mask in front of the focal plane prevents access of light to the back portion of the camera, this mask is hinged and kept closed by a spring. When turning the lever which revolves the prism, and the knob which turns the plate carriers, the motion should be from the opening to the hinge of the mask. The lens is single achromatic, and the shutter is adapted either for time or instantaneous work. A pull on the string I’ sets the shutter, whilst it is liberated by a slight pressure on E. The apparatus is covered in cloth, and can be obtained from most photographic dealers.