The Optical Magic Lantern Journal (December 1890)

62 The Optical Magio Lantern Journal and Photograpio Enlarger. pulling the cord J the shutter is set, whilst a touch on | cord K makes the exposure. When it is required to insert a stop in the lens, or alter the speed of the shutter, the front may be opened, as shown in Fig. 3. The method of changing the plates is as ingenious as it is novel. At G (Fig. 2), underneath the camera, | is a bolt; when this is pushed up it causes two pro| jections or teeth to raise the ex‘ posed plate clear of the bar which | mee previously kept it in position ; the | bolt is then pulled slightly down; wards, and causes a projection to | . press on the upper edge of the | plate, which liberates it from the groove above, causing it to be! deposited face downwards in the receiving chamber, from whence it is taken for development. ae The RR lens is manufactured Fic, 3. by Laverne, which is a guarantee of its high class qualifications. Should it be wished to take a view on a vertical plate, those that have been exposed and passed into the receiving chamber are secured in position by turning a small brass arm, placed at the side of the lens, as shown in Fig. 3. For time exposures the camera can be placed on an ordinary tripod, anda cap used. Asa precaution when Opening the front of the camera, the flat catch L (Fig. 2) should be turned down, which causes a shutter situated behind the lens to close, thus preventing access of any light. The camera is carefully and cleverly made, as well as beautifully finished; and after one has mentally grasped its mechanism it will be found to work with ease and nicety. Two firms of plate manufacturers—viz., Messrs. ' Mawson & Swan, and R. W. Thomas & Co., Limited— ' supply plates ready backed specially for these cameras, ‘so that every facility is put in the way of the users. 10: Hints on Enlarging. By A. R. DRESSER. CHAPTER II. | AS I stated in my previous paper, there is much more trouble and expense in making an enlarged negative than by enlarging in bromide direct ; but there are | some advantages, such as combination printing, as | you can take certain parts out of any negative and make two or three positives as required, then bind them together and copy with a wide angle lens, and the negative thus obtained will be in focus. When one can work by daylight it is far the best to do so; but for those unable to find time for so doing a good way to work is by using your magic lantern; nowadays almost every amateur {f Positive in frame G (Fig. 1), and then about 6ft. or 7ft. away from the negatives, place your lantern, fake out the lens, and only use the condenser ; then move lantern back and forwards until the disc of light is about 3ft. in diameter ; then place so that the negative is in the centre of the disc of the light thrown by the lantern. Mind and put a piece of ground glass behind the negative, or else you will not get even illumination. If you do not possess a magic lantern, focus by a lamp, and use magnesium wire for the exposure, and by a few trials one will readily ascertain the necessary exposure. In my previous article I described my apparatus, and gave a rough drawing. Now in Figs. 2 and 3 I give different drawings of it—viz., camera as ready for enlarging up to 8x 10 (Fig. 2). You see the part used for holding the negative is slightly different, as I have arranged the holder for the negative so that it can be moved to any angle; this I find of great use when | copying a negative that has not got the lines straight. It will be observed that the general principle of Figs. 1 and 2 is the same; but the support of the camera—viz., AA—is not supplied with legs, but can be moved about and put on anv table or stand ; then the front (E) for holding negatives is quite different, as the 2 : part that holds the negative works round in a circle, so that you can place your negative vertical, horizontal, or at azy angle with ease. The drawing (Fig. 4) will explain what I mean. Take a piece of wood, say ' rqin. square (A), and with a lock saw cut out a circle about gin. in diameter (J3); then cut two pieces of sheet tin the same sizeas the wood—viz., 14in. square— and cut out a circular hole of about Sin. ; now place a piece of tin each side of the wood, and screw it on wood, and then you will find the circle of wood (B) has, or ought to have, one. The best way to use the lantern is, of course, with the limelight, and as I always use that light, I will describe the way I work, taking it for granted the limelight is used. Place your negative or Fic. 3. can be rotated as required. Then place a thumb screw on each side of B at C, which will overlap the