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

44middle lantern. The lateral|line is made to cover by means of stop onleft of lantern, when these two crosses superimpose and meet in everyway bring the set screws well up to prevent any moving of platformscrews as before mentioned. Top lantern is now finished.Now take the same cross slide as used for top lantern, and place inthe bottom and proceed to register this bottom + on to the middlelantern with its + using the platform to raise or lower, adjusting the stopfor the lateral movement. It is important that the set screws be clampedtightly, and in so doing care must be taken that the platform screws arenot moved.If the above directions are strictly carried out, the registering of allthree lanterns will be identical, viz., the two crosses can be placed inany two lanterns, and they will register dead true on the screen, changingthem as often as you like.testThis exactness can only be obtained with registering platforms andor cross slides, the latter being identical to a minimum in every way,These "trued" test slides can only be obtained from Mr. Hughes.The special masked carriers may now be put in and they will befound to be exactly one over the other, if not, a small plane may beused to take ofif a shaving if required, as a rule this is not necessary.In starting to register up efifects, always register the first slide on to acarrier frame.REGISTERING TRIPLE WITHOUT ADJUSTABLE STAGES.If the lantern is of ordinary pattern without registering rods or adjustingstages, lower the top disc, and make it superimpose with the centreby means of the registeringscrews and milled nuts at the two corners ofthe front, loosen the screws, when the spring at the back will force itforward, it may be necessary to bring one side considerably moreforward than the other, as the front is let down it should be backed upwith the set screws behind, to prevent it going back.When registering the discs for the first time they should superimposeexactly, even if it is a little unpleasant and tiring work, allthis must be done on the focus, i.e. a slide put in and focussed up sharp,in preference, the same slide to each lantern. Presuming the top discis coincident with the centre, turn off top lantern and register the bottomdisc to the middle in the same manner, only here the bottom front musttilt upwards, bringing up the back screws, to hold the front as we loosenthe milled head.