ENLARGING ARTIFICIAL LIGHT OUT A LANTERN.
Fig. 447 shows an arrangement for making either enlarged negatives or prints without an enlarging lantern. In the bottom of a lidless box ..Nt cut an opening 4i in. by in. ; fit grooves A A top and bottom, to carry the negative B (the box is standing on end). Make a wooden box D of the size and shape indicated, having an opening at F a little smaller than the hand camera it, and with a close-fitting fillet run round it on the outer side at J, forming a recess, into which the back of the camera fits, and is supported on the bracket E. The bracket is either detach able or hinged at o o. At the rear of the box is fastened another fillet P, at exactly 13 in. from the lens stops. Cut a slot right down one side rather greater in width than the thickness of a whole-plate printing frame. The frame should now be built up at the same side flush with the outside of the box, and a further piece screwed on, projecting I. in. each way be yond the opening, and fitting close to ex clude light. Insert the frame, facing the lens, and screw another fillet behind it, so that it just runs easily between them. The frame is assumed to measure 103 in. by 81 in. Cut from a block of wood c recess to form a bed for the condenser N, the centre of which must be exactly op posite the centre of the negative, the lens, and the printing frame. A lid may be hinged to D. The camera and other loose parts may then be stored inside. Now construct a board 36 in. by 8 in., hinged in the centre. Put two screws in the ex treme end ; these, by engaging with holes in a, ensure its being always in the same place. Now place the other parts roughly
in position. Fix, with drawing-pins at the corners, the sheet of ground glass, rough side outwards, in the printing frame, and insert it in D. Having put the negative in position, focus very accurately by moving the box to and fro. The con denser and light are next manipulated until the corners of the negative arc illuminuted and an evenly lighted screen i3 obtained. Then screw the block in position in _11, and fit the points for the other parts as before. Instead of using a condenser, a. piece of magnesium wire may be burnt behind the negative (if the negative is small), the light being waved about so that the negative may be evenly illuminated. In this case a sheet of ground glass should be placed between the light and negative. To use the a.p pat atus it will be merely necessary to in sert the negative, then place in the print ing frame a sheet of clear glass, free from bubbles or scratches, and of the same thickness as the ground glass mentioned above. Place upon this, face downwards or outwards, a. sheet of bromide paper, and, having turned the light down very low, insert through K. If preferred, a sheet of cardboard, which can be slid oat after placing the frame in position, may be made to run in front of the printing frame. The above dimensions are worked out on the assumption that a 5-in. focus lens is used.