Audels Electronic Devices with Industrial Applications for Electronic Electricians Maintenance Men Operators and Students  A Practical Treatise covering Electronic Fundamentals Phototubes, Amplifiers and Relays by Edwin P. Anderson published by Theo. Audel & Co. 1952 original copyright 1938.  An Electronic Primer book in good shape for vintage age. Refer to table of contents but some of the items it covers is Vacuum Tubes and Phototube.  There is shelf wear along the top and bottom of cover edges with scratches showing at the spine. There is no writing, earmarking or tears to the pages. The pages are a very light weight bond to the point of can see the print from the next page and hard to determine but there maybe age discoloration but if so it is consistent to the page. Refer to the pictures which include title page, table of contents, copyright, measurements and examples of conditions.