The international photographer (Jan-Dec 1937)

PHOTOGRAPHER (Laboratory — Cont.) OCTOBER, 1937—25 tion under conditions of the most rigorous laboratory control. All of the producing color companies today have found it necessary to employ analytical methods in the control of their processing operations, and it is the purpose of this present series of papers to discuss the chemistry of the various photographic operations, and to describe the analytical methods used in the chemical laboratory for maintaining both color and black-and-white processing solutions at maximum efficiency. Methods developed by the author and in use todav by the major color laboratories for controlling their processing solutions will be described. These will include analytical methods for the major constituents of iron tone, uranium tone, iodine bleach, dye-tone, developer, hypo and bi-pack clearing solutions. The following basic equipment will be required for the analytical operations. Any additional specialized apparatus will be described and illustrated as occasion requires. Apparatus carrying the Seal of Approval of the new Technical Jury of the IATSE will be recommended; and dealer sources of such apparatus will be supplied upon request. 3— Burettes, 100 ml. matic preferred ) . 3— Burettes. 100 ml. preferred ) . 2— Pipettes, 10 ml. 2 — Pipette-. 25 ml. 2— Pipettes. SO nd. I flask, volumetric, 1 — Flask, volumetric, 1 — Flask, volumetric, 10 Flasks, Erlenmeyer, 200 ml. 5— Funnels, 60°, 100 mm. diam.. 300 mm. stem. 2 — Burners, Tirrill type. 1 — Burner, blast, round flame. 1 — Analytical balance, capacity 100 gms.. sensitivity 0.1 mg. 1 — pH Meter. 1 — Colorimeter; Wedge or Duboscq. D. K. Allison. Voltage Control Westinghouse DT-5 Mercury Tube wins approval at Hal Roach lot for lab and process voltage regulation. Laboratory workers will be interested in the results obtained at Hal Roach studios by Charles Levin, lab superintendent, working in cooperation with Thomas Reid of the Westinghouse Electric Company in securing proper voltage regulation to maintain an even flow of current to printing machines, process cameras and various other apparatus which derive their power from direct current from a generator set. Generator fluctuations cause the voltage to vary, oscillate and change, due to sudden changes in line voltage when loads are thrown on and off from sets using large amounts of lamps and other electrical equipment. The Roach organization tried several Scbellbac h (auto plain (a Ut( matic 100 ml. S00 ml. 1000 ml. methods of voltage regulation by mechanical means, even going so far as to discard a generator set which they considered antiquated and to all appearances no longer fit for use — but to very little advantage. Recently in cooperation with West inghouse, Levin installed a DT-5 Mercury Tube voltage regulator and reports that after several tests under production conditions, it has stod up very satisfactorily. The Roach organization recommends this setup highly for laboratory and process departments. PtcceAJ Montage Marches In Regardless of mueh-clebated meaning of the word, montage, as Hollywood knows it now, is a praetieal and essential element in modern motion picture production. The word and even the idea of "montage" has alwavs been a quick stimulus to argument, politely known as a "discussion," in almost any Hollvwood gathering. The debate ranges from just what montage is to just how important or unimportant it may be. Realists, weather eye on the "b.o. take," may sneer it off with mutterings against all things "arty." Esthetes will drown the idea in a sea of definitions and theories. \et a middle course is being drawn between the banalities of formula picture making and the devious mysticisms of the "cinema art form" fraternity, so that montage already has assumed a practical and essential role in Hollvwood production. A, leader in achieving this compromise between bread-and-butter and highblown theory is Slavko Vorkapich, onetime artist, later film director, now at Metro-Goldwyn-Mayer as an expert on montage sequences, sometimes ambigu Slavko Vorkapich, Montage proponent.