New York: Theo. Audel & Co., 1917. [Revised 2d edition]. Two 16mo volumes with limp boards and gilt stamping; gilt edges; illustrations, diagrams; 835p total; index; 17 cm Both very good to very good (-); tight and crisp; gilt edges bright and clean; there is a small tear at front hinge of No. 10, but with no effect upon binding; minor exterior wear to both and some sections with pencil underlining and notes. Hardcover.
No. 9 Content: Railways, motion pictures, automobiles, ignition. No. 10 Content: Modern applications of electricity, reference index. Notes: "Credit is largely due to Frank D. Graham ... for the authorship of the Guides, and for the original sketches illustrating electrical principles and construction."--Preface to no. 1. High quality printing.
