. Carnegie Institution of Washington publication. 146 BACTERIA IN RELATION TO PLANT Fig. 130* sharp as possible with stop wide open and then stops clown to 16 u. s. before making the picture. There are two other ways of making lantern-slides, /. e., by contact exposure, the gelatin films face to face, and by means of a long box-camera with the negative in one end, the lantern-slide carrier in the other end, and the lens between the two, /. r., inside the camera-box, held in a framework sliding between the two ends and having front and rear bellows attached to its outside parts. The
. Carnegie Institution of Washington publication. 146 BACTERIA IN RELATION TO PLANT Fig. 130* sharp as possible with stop wide open and then stops clown to 16 u. s. before making the picture. There are two other ways of making lantern-slides, /. e., by contact exposure, the gelatin films face to face, and by means of a long box-camera with the negative in one end, the lantern-slide carrier in the other end, and the lens between the two, /. r., inside the camera-box, held in a framework sliding between the two ends and having front and rear bellows attached to its outside parts. The method by contact exposure is not very satis- factory unless the negative and the lantern-slide are of the same size. The box-method is a very good one. A box of this kind is very convenient, and may also be used for enlargements up to 5 or 6 times. The bellows-extension should be ample, so that various lenses may be accommodated and so that lantern-slides maybe made from large negatives if desired, i. e., the solid framework or track on which the parts slide should be about 6 feet long, and the bellows-extension to either side of the middle piece should be not less than 3 feet, exclusive of the woodwork at each end and in the middle. A very good apparatus of this sort is shown in plate 17. It is the Folmer & Schwing enlarging, reducing, and copying camera, mounted on a plain wooden table of home construction, and the only defect I have discovered in it is that it has too short a bellows for use with lenses having a 12-inch focus. It has a very neat device for obtaining a sharp focus and many other conveniences, and might just as well be made with a longer bellows. It is convenient to have a box which will take n by 14 plates. When making lanteni- slides the end of the box carrying the negative is pointed toward the window and is elevated a foot or more to secure uniform light- ing. The writer has found the Voigtlaender collinear lens, series III, No. 6, very satisfactory f
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