This is a vintage GE Photo Data Book by the General Electric Company. Printed in 1946, it was a reference guide on how to use the GE Exposure Meters with various types of film and cameras. During this period, there was no such thing as 'automatic exposure' and every shot had to be metered correctly to arrive at the correct shutter speed and aperture setting. This was especially important for single-exposure sheet film cameras or roll film cameras limited to 12-exposures. 

Fair Condition: there is the usual wear expected for a reference guide that is nearly 80-years old. While there are no tears or missing pages, the cover has dried out and there are signs of past water damage. 

Although we try to give an accurate description, remember, this is a vintage item and there may be small imperfections from age or flaws from production that we have not noticed or noted in the comments. We try to list all the deficiencies, marks etc. Please review ALL pictures closely as they represent exactly what is shipping. If you have questions, please let me know.