. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. Em. 107.—Edclrnanns SpectrumBurner 3o8 OPTICAL PROJECTION internal bore \ inch diameter for the hydrogen, surroundedby oxygen. Hydrogen is made in a bottle with zinc scrapsand dilute hydrochloric acid, the chloride of sodium, lithium,or calcium being dissolved in the water to saturation; andto assist the rush of gas and carry up more of the spray ofthe liquid into the flame, either hydrogen or coal-gas is alsopassed through the liquid by the ordinary wash-bottle the oxygen is pro
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. Em. 107.—Edclrnanns SpectrumBurner 3o8 OPTICAL PROJECTION internal bore \ inch diameter for the hydrogen, surroundedby oxygen. Hydrogen is made in a bottle with zinc scrapsand dilute hydrochloric acid, the chloride of sodium, lithium,or calcium being dissolved in the water to saturation; andto assist the rush of gas and carry up more of the spray ofthe liquid into the flame, either hydrogen or coal-gas is alsopassed through the liquid by the ordinary wash-bottle the oxygen is properly adjusted, the lines are prettybright. Bright lines may also be shown upon the continuousspectrum, by melting the chlorides of the alkalies, upon thesurface of a hard lime cylinder, and using this in the ordinaryway. The brightest method of projecting the sodium line with. Fig. 168.—Combustion Lantern the oxy-hydrogen flame is that adopted by the late A jet for burning the two gases is furnishedwith a hollow chamber in the course of the hydrogen this chamber is introduced some metallic sodium, andthe chamber is heated in a Bunsen burner; the gas thencarries over with it a copious supply of sodium vapour, whichburns with intense brilliance at the orifice of the jet. The lines of some alkaline earths may also be excellentlyshown by a simple apparatus devised by Prof. Weinhold, andshown in figs. 1G8 and 1G9, fig. 1G8 being a plan one-thirdthe natural size, fig. 169 a perspective view on a smallerscale. The body is a small cubical lantern, with a door at theback fastened by the catch g, and with a nozzle on the front THE SPECTRUM 309 into which slides a metal tube, enlarging at the front end intoa long cone r, and at the back end bearing a plate with a slits. The cone r is made to extend nearly to the lens whichfocusses the slit
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
