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

39ceding one, therefore giving greater solidity than any of the old telescopicdraw tubes ; it is easy to handle and very simple to rack out, no leveragebeing required to focus the tubes out as in the old method. The simplestand most rigid beyond a doubt, is a solid tube with one draw made to slideout several inches ; most exhibitors of note use long focus lenses, whichare taken off the lantern for travelling, these are packed separately with thesolid lengthening tubes, and are made with a coarse thread to screw tothe lantern front easily. For perfect registration and firmness this formof lengthening tube commands first attention, as it will do for two orthree sets of lenses of various foci, and if ever very short focus lensesare used, a separate small tube can be screwed in the place of the longones. With properly made tubes of this character no support of anykind is necessary, and such an old enthusiast as Mr. B. J.Maidenwould not adopt this plan if it were not the best.PORTABLE TRIPLE.