. Some operators prefe;to make a double pres-sure board, placing thebags one over the other,as shown in this diagram,and thus make the sameweights answer for both SI Geo. H. Pierce, Philadelphia, Pa. OXY-CALCIUM The Oxy-Calcium Light is inferior io the oxy-hydrogen, though farmore intense than the most brilliant oil lamp, its illuminating power beingequal to the light of one hundred candles. It differs from the oxy-hydro-gen in using but one gas, oxygen; the flame of an alcohol lamp replacingthe hydrogen. The Oxy-Calc
. Some operators prefe;to make a double pres-sure board, placing thebags one over the other,as shown in this diagram,and thus make the sameweights answer for both SI Geo. H. Pierce, Philadelphia, Pa. OXY-CALCIUM The Oxy-Calcium Light is inferior io the oxy-hydrogen, though farmore intense than the most brilliant oil lamp, its illuminating power beingequal to the light of one hundred candles. It differs from the oxy-hydro-gen in using but one gas, oxygen; the flame of an alcohol lamp replacingthe hydrogen. The Oxy-Calcium Apparatus is more compact and portable than theoxy-hydrogen, more simple, and more easy to manage. It will illuminatethe views brilliantly when magnified to an area of fifteenfeet,^ {two hund-red and twenty-five square feet). 22 Geo. H. Pierce, Philadelphia. Pa. OXY-CALCIUM STEREOPTICONS. No. 620. ^—AiTonsistine of Two Japanned Lanterns, each ten by eight inches square, sixteeniT,;4 hieh hinged Door at side and Sliding Door at back of each Lantern; firstquality pllno-convex Condensing-Lenses, 4^ inches diameter; first-quality Achro-^ nhippt ClasseSi eiving High and Low-power Combinations; brasswork AdLtment for focussing; T. H. McAllisters Slide Spring and Stop;T H M
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectproject, bookyear1888
