PRODUCTION OF CHEMICAL DRAWINGS BY A RAPID METHOD EUGENE W. BLANK Research and Development Department, Colgate-Palmolive-Peet Co., Jersey City, New Jersey
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ONSIDERABLE labor is entailed in the production of numerous, Werent chemical drawings of apparatus setups. A method of procedure by which the amount of work could be decreased would be of definite value. A method which has proved helpful will be briefly described. Draw standard pieces of apparatus with India ink on small sections of thin, white Bristol board or a good grade of heavy, bond paper, making the lines rather heavy. Points of contact of the different pieces of apparatus with other pieces should be drawn to the edge of the card. In the figure dotted lines indicate the edges of the small cards on which the drawings have been made and illustrate how the drawings should be arranged. A plentiful supply of drawings representing glass tubing bent to various curves should be available. Stoppers and clamps are best cut to shape from black Rubber cokections on glass tnhng are indicated by black paper rectangles. The figure illustrates a distillation setup. A large, white Bristol card is used as a background. On this are arranged the various small cards representing individual pieces of apparatus until the entire setup has been constructed. Cover the arrangement with a sheet of glass to prevent shifting of the cards and photograph the drawing. Any number of variety of drawings can be quickly constructed in this manner and photographed. Tubing and thermometers are drawn on slender strips of the cardboard and inserted to the proper depth in the necks of flasks or other pieces of apparatus. A stopper is cut from black paper to fit the neck of the flask and laid over the tub in^- or thermometer in the proper position. Contents of flasks are represented by half circles cut to fit the flasks on which lines have been drawn indicating the nature of the material.
Block letters can be arranged, on the drawings, as a title, or a caption may be hand printed or typed on a separate sheet of white paper and arranged on the background before photographing. Make the drawings somewhat large to facilitate the work. Very intricate designs can be kept in order by attaching the small cards to the background with the aid of stamp hinges or mending tissue. Stamp hinges are preferable because they can be removed easily, thus preventing damage to the drawings. The edges of the small cards do not photograph if the drawing is well illuminated from all sides and a correctly timed exposure is made. FIounE,-ILLUSmTINo
MANNER
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WHICA CH&MIULL
D R ~ I N GCAN S BE ~ P D L YB-T UP BY TAB USE OF INDIVIDUAL DRAWINGS oa VARIOUSPIECESOR APPARATUS
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FIOURE 1.-RAPIDPRODUCTION OF Casancn~DRAWING^
