The Art of projection and complete magic lantern ... - Yesterday Image

45With all three discs, as coincident as possible, we proceed to registerthe carriers. If they are plain square carriers it is an easy matter,turn any two lanterns on, place the carrier in one, move it about untilit fits equally in the circle, it may require piecing on the bottom to makeit higher, or plaining off to bring it lower. Move the frame from right toleft and having obtained exactly the centre of condenser place a screwat bottom of the corner of frame nearest to the operator, to act as a stopin future, to prevent the frame going in too far, the thin edge of thescrew is apt to wear a hole in the edge of the slide stage, to preventthis, file the edge down, of course due allowance must be madefor the amount to be filed off,—when finished try it two or threetimes in and out the lantern, to make sure the screw does not moveand is in the right position. Carrier No. i is thus finished, mark it forthe lantern it belongs to, proceed to register carrier No. 2, on to this, inlike manner, and mark it for its respective lantern. Register carrier No.3 mark also ; the carriers are then registered and always ready for use.If the carriers have masks, square, or circular, so much the better,only tobe of any service, the carrier masks must be of a smaller aperture thanthe slide mounts, and this means cutting off some of the edge of thepicture. When effects have to be registered, start with two plain discsshowing, place the first slide of the set in either of the lanterns, moveit until it is exactly in the centre of the white disc of the second lantern,block up the framC; or plane off, as the case may be, and put in screwto act as stop, the second slide should be registered on to the first, thethird on to the second, and so until the set is completed, marking eachslide for the lantern it is registered for. With every fresh slide commencein the same manner again. With a triple lantern, always if possible,arrange effect slide to come in the bottom lantern, the set slide in thetop or middle.Although the above system is good, and from experience found to bethe best of any for lanterns, without registered stages, yet it is not apermanent or reliable method.THE COMPLETE SYSTEM OF REGISTERING.If a lantern has only one set of fixed lenses, and no others are to beused, the slide stages themselves may be trued, and can be easilyaccomplished by one familiar with the use of tools.The distance of the slide stage from the condenser must be mathematically true to a minimum, and mathematically true to the opticalsystem. Any lantern can be trued in a short time.