In coses where such values ore included directly on the curves, the principles outlined under "Curve Designations," pages 52 and 53, should be observed.

5. A Grid with frequent horizontal rulings may often make the reading of amounts sufficiently precise to obviate the need for actual data.

The arrow and designation "Edge of Paper" have been added to the original in order to indicate that the outside line is not a frame. See 382.

E Lcitr, Inc . Nfw York.

A. Leica Camera.

Cnniliil Cnnirra Corp ol Amrrica, Chicngo. III.

B. Perfex 44.

Chapter 46

Carl Zciii, Inr . New York,

C. Contax Camera.

THE CAMERA AND ITS USE

REPORTS, publicity, etc., now consist largely of photographs and graphic charts. A camera is a necessity and some knowledge of photographic possibilities imperative. For the inexperienced, a reflex such as E, below, showing a full size image in the focusing finder, is desirable. Imported miniature cameras like A and C above, of high quality, have interchangeable lenses and attachments covering the whole photographic field -- if expertly handled. American miniatures are cheaper but only the Perfex 44, B above, approaches the Europeans in quality and flexibility.

For contact prints cameras of the Speed Graphic or Linhof type, D and F below, are widely used by reporters and professional photographers. Made in several sizes, they use film pack, cut film or plates, and can be fitted with lenses of different focal lengths.

Folmer Graflrz Corp. Rochritrr. N Y

D. The Speec Graphic.