The Moving Picture World (April 1907)

THE MOVING PICTURE WORLD. x*3 light We apply a little more hydrogen, and a slight bit of oxygen, being careful not to use too much oxygen, as it is likely to dim the light. It is always best to allow a little red flame to escape from the side of the burner and in this way a little more oxygen can be added, if necessary. C: As you have shown me regarding the calcium burn- er, is it necessary for me to undertake a course in elec- tricity? D.:No. C: In what way can I obtain this information and in- struction? D.: It can only be obtained by practical experience. I can illustrate the same in a brief way to you; however, quite a number of ways can be used. There are various electric currents and we rarely find two places wherein the current runs the same. I can demonstrate with the current we have here, which is direct, no volts. C.: How many volts are necessary ? D.; That depends also upon circumstances, which I will try to explain. The voltage required for operating an electric lamp differs from 47 to 49 volts across the arc, and, .as the law of this city will not permit more than 25 amperes to be used, a rheostat carrying this amount of amperes must be used to govern the current. C: What do you mean by amperes? D.: Amperage is the quantity of current used, and votage is the pressure. C: But as you say you use from 47 to 49 volts across the arc and still you have no volts from your supplying mains, what becomes of the rest of the voltage? D.: We place a rheostat or resistance box between our main and our lamp, which controls the given quan- tity of current used. C: Does the rheostat control the current? D.: No. The carbons as a rule control the current, and the, resistance controls the quantity used. There is a positive and negative coil on direct current. For ex- ample: we place a five-eighths-inch soft core carbon on the top carbon holder, and a half-inch hard or solid car- bon in the bottom carbon holder, and in this way, on direct current, the carbons burn nearly alike. C.: Why do you place a smaller carbon on the bottom. and a larger carbon on the top? D.: The positive coil being nearly twice as powerful as the negative, therefore requires a larger carbon; so that it will not burn any faster than the smaller one; in proportion to keep the light as nearly centre as possible. C: How do you place these carbons in the lamp? D.: We place the lamp at an angle of about 30 degrees and set the lower half-inch hard carbon a little forward of the upper carbon. C: Why do you do this? D.: Experience has taught us to get the arc as far front and to bring the crater or bead of light to the forward part of the carbons, in which event the intensity of the ray is retained in front of the carbons. {To be Continued) The Theatorium, a new place of amusement, has been opened to the public at No. 13 West Main street, Johns- town, N. Y. The store at that number has been recently renovated, a new front placed in it and the interior made over in an attractive manner, being nicely arranged for the exhibitions of moving pictures which are to be given daily excepting Sunday from 2 o'clock in the afternoon until 11 o'clock at night. The views exhibited are the highest priced and selected with much care. The performance consists entirely of moving pictures and illustrated songs, with a change of views twice each week. Prof. Favereau will act as pianist. Clarence Dailey, of Gloversville, is the manager. The Percy & Curry Moving Picture Company have come to Nashua for a long engagement, and will run a continuous entertainment every afternoon and evening at O'Donnell hall. They have a large and very fine dis- play of up-to-date pictures, including a great range of subjects. kinetoscopes, Cameragraphs and 5>tCrCOptICOnS everything in supplies C. B. KLE1HE, 662-664 Sixth Ave., Send for Catalog F. New York. IF YOU WANT THE BEST RENT YOUR FILMS FROM HARRY DAVIS Davis Building, 347 Fifth Avenue PITTSBURG, PA.