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

;33the thing a study, and used such an arrangement for years, it may be asplain as the alphabet, to the average lanternist it must be an incessantsource of anxiety.The sole secret of perfect lantern manipulation is simplicity of workingas all experienced lanternists acknowledge. Several arrangements aredevised for enabling the gas or gases to be turned off and on withoutdisturbing the previously adjusted jet. But the best of them is thesingle Maiden dissolver, or star pattern tap, fitted with adjustable byepass.With three single dissolving taps on a triple, and two on abiunial, complete control is given over each lantern, with a considerablesaving of gas.In the case of a triple, one double tap is sometimes used for themiddle and bottom lanterns, with a single tap for the top. The simplestprinciple beyond all doubt, is " one lantern, one tap." If one doubleis used for two bottom lanterns, fit up with tubing and connect same asdescribed for a biunial, the singletap as described later on.To prevent a complication of tubing, a brass supply pipe with three outletsis arranged up each side of the back of the lantern, hydrogen supplypipe on the left and oxygen on the right. Each oxygen outlet is connectedwith the top pipe of the dissolver, by means of rubber tubing. Thehydrogen is connected in the same manner to the dissolver and supplypipe, in other words, the two top pipes of dissolver are the supplies, andthe two bottom pipes serve the jets.(See illustration, page J2.)When the handle or bar attached to the plug of dissolver is horizontal,the lantern is on and both gases are supplying the jet, when the bar isturned either up or down the gases are shut off from the jet. To preventthe gases being turned completely out in the lantern when the handle ismoved up or down, bye-passes are fitted each side of the dissolverplug which allows a small leak of gas to be kept always burning.Triple Lanterns are really only the addition of a third lantern to theneeded in the construction, to bring about theBiunial, but special care isextra result that is anticipated. Many people imagine that a single lanternplaced on a Biunial will give them the same result as a triple madethroughout. In the first instance, this is so, up to a certain point, butwhen it comes to the technical parts, the solidity that is required forcrucial registration, it is found lacking those qualities. The stereotypedquestion of" what is the use of a Triple ? " is so often forthcoming that itwill prevent some misconception if explained now. Take the set ofThe Grotto of Calypso, a lake scene, a rising grotto, nymphs sailingc