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

76village hj is destined for, is of a poor illuminating power. Whennecessary to make hydrogen gas, a hydrogen generator, and purifier, arenecessary. The generator must be made of lead, this metal being nonaffectedby the acid. It is necessary to use a purifier as for oxygen gasmakingbut do not use the same for both purposes. Keep them separateby a distinctive mark, connect with rubber tubing in like manner as foroxygen, the generator bent tube to the perpendicular tube of the washbottle.The top is unscrewed of the leaden generator, and granulated zincintroduced, covering the generator bottom to the depth of about two inchestlie top containing the tubes should be screwed into its place, the leadenfunnel placed into the long perpendicular tube, and sufficient waterintroduced to cover the zinc to the depth of about three inches, or influid measure, about two pints, Sulphuric acid (commercial oil of vitriol)should next be introduced in small quantities through the samepipe, about a gill at the time, when a rapid evolution of gas takes place.Now, the substances which have been put into the generator willact upon one another, and the hydrogen is set free, and escapes.If water were not us^ed, hydrogen gas would not be given off freely.When sufficient of the gas has passed over to expel the air in the generatorand purifier, the connection should be made to the bag, thisprecaution must not be overlooked in making hydrogen gas.It is betterto waste a little gas than allow common air to mix with this gas, as thetwo mixed together form an explosive mixture.After a time the evolutionof the gas declines, when fresh vitriol should be poured through the funnel.There is a point at which the acid will not restore the action, then thetop containing the tubes is unscrewed, the fluid only thrown away, asthe hydrogen properties of the water are used up, introduce fresh waterinto the generator, as before, then the vitriol. When sufficient gas isobtained, wash out leaden vessel, throwing away the liquid, as it is of nofurther use, the zinc may be preserved for future operations.Granulated zinc, if not obtainable is made in the following manner.First melt some zinc, when it is melted, pour it into cold water, it isthen granulated, or strips of sheet zinc cut small may be employed.Sulphuric acid, or commercial oil of vitriol, is obtainable very cheaply,care should be taken to keep it off the clothes and hands, it being of avery destructive nature.REGULATORS.In using a triple or biunial lantern these are necessary adjuncts for