This section is from the "Studio light a magazine of information for the profession 1923" book, by Sara F. T. Price. Also see Amazon: Studio light a magazine of information for the profession 1923.
Orders are frequently received by the commercial photographer for a series of lantern slides from copy that necessitates the making of preliminary negatives.
Mr. C. E. Anderson of Syracuse, N. Y. suggests a short cut that eliminates considerable tedious work. A number of negatives can be made on a 5x7 film as the negatives are made for contact printing and of necessity must be small in size. A Century Multiplying Back can be used for this purpose as it enables one to make 2, 4, 9, 15 or 24 exposures on a 5x7 film.
Mr. Anderson recommends Eastman Process Film for the negative making as it produces a clear snappy negative even with a soft working developer. For line work such as reproductions of drawings or printed matter a contrast developer may be used.
When negatives of the right size for contact printing have been made they are cut apart on a trimming board and all of the surplus margins cut away leaving each negative the exact size you wish the positive to be.
These negatives are then placed on clear glass and held in position by two small daubs of transparent rubber cement. One glass is all that is required, for as soon as the print has been made from one negative it may be lifted off and another placed in position. The cement should be allowed to partially dry before the negative is placed on it. It will be tacky enough to be used for a considerable time before it needs renewing as it does not pull off with the negative. With the small trimmed negative held firmly in place a lantern slide plate may easily be placed in position for printing. When the plate is developed the background will be a good opaque black and there will be no need for a paper mask. Place it against a piece of cover glass, bind the edges and your slide is ready for projecting.
The small trimmed film negatives may be filed away, a number in one envelope,and held for future orders when there will be no possible question as to what were the sizes of the originals.
One is not bound to use Process Film entirely but Mr. Anderson finds that it covers the greater number of subjects and gives the desired contrast for projection work. On copy requiring the rendering of color values Mr. Anderson uses Commercial Ortho or Panchromatic Film in the same manner using filters to give the correct color rendering or to render colors sufficiently light so that slides can readily be tinted.
PORTRAIT FILM NEGATIVE. VITAVA PRINT
By The Green-Crane Studio Kansas City, Mo.