METHODS OF RESEARCH I APPARATUS 



91 



shutter. I prefer the Zeiss double-protar lenses, Series Vila. 

 These are made and sold by Bausch and Lomb, Rochester, N. Y., 

 under the name of Convertible Anastigmatic Lenses, Series 

 Vila. Very recently (1919) Mr. E. L. Crandall of the United 



B 



FIG. 58. The Crandall model view camera which can also be used for small 

 objects natural size or X 2. Bellows extension 18 inches, weight 5% pounds with- 

 out tripod. Well made. This takes a B. and L. Zeiss Double Protar Vila lens 

 having a focus of about 5 inches. Front combination focus about 8 inches, rear 

 combination focus about 12 inches. Made by the Folmer and Schwing Division 

 of the Eastman Kodak Co., Rochester, N. Y. It carries a film, dry plate or Lu- 

 meire plate 3} by 4*4 inches. 



States Department of Agriculture, has designed an excellent,' 

 moderate priced small camera for field work that can also be 

 used for small objects natural size or twice enlarged (Fig. 58). 

 This also is made by the Eastman Kodak Co. 



