Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . eat, stir,and set aside to cool. Mix 6 ounces of the pi tsma graduallywith 8 ounces water in a porcelain measure, and set in ui-arlyboiling ^vater. When hot enough, drop in 2 drams of phospho-rus. When this has fused, agitate the whole thoroughly and in-troduce as much more phosphorus, repeating the oi>eration un til 2ounces of phosphorus have been added Afle
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . eat, stir,and set aside to cool. Mix 6 ounces of the pi tsma graduallywith 8 ounces water in a porcelain measure, and set in ui-arlyboiling ^vater. When hot enough, drop in 2 drams of phospho-rus. When this has fused, agitate the whole thoroughly and in-troduce as much more phosphorus, repeating the oi>eration un til 2ounces of phosphorus have been added Afler this, thicken thi-phosphoric emulsion vrith more of the reserve! plasma, andfinally incorporate it thoroughly with the rernriinder small, wide-mouthed bottles, protected from the air. Photics. That department of science whichtre;iis of light. The term originatf^il in the UnitedStates Patent Office, and is there applied to that classof mechanical inventions embracing himps, gas-liglitarrangements, and illuminating apparatus gener-ally. Photo-e-lectric Lamp. A name for the elec-tric lamp. Fig. 3671 illustrates the electro-magnetic safety-lamp invent-ed by M^I. Dumas and Benoit for miners use. The generat- Fig. Photo Eectric Lamp [Box closed). ing cell and helix are inclosed in a case provided with astrap, by which it may Ije slung over the miners helix wires pass through insulating tubes to an illuminat-ing coil within tue gl;;.>s cylinder, which prevents accessI of fire-damp to the See Safety-lamp. Photo-e-lectro-type. {Pkotoicturc is jjroduced in ! relief so as to afford, by electro-deposition, a matrix for a cast, from wliich impressions in ink may be obtained. See Photo-galvanograph, etc. Photo-en-graving. 1. A name aiiplied toeach of many i>rocesses, in which the action of lighton a sensitized surface is made to change the natureor condition of tlie substance uf the plati or its coat-ing, so that it may by processes be ma
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