This Aircraft Electrical Systems Technical Manual (No. 1-406) was produced by order of the Secretary of War: G.C. Marshall (Chief of Staff) and was considered a "restricted" publication during World War II.  The major sections of this technical manual are as follows: 1) Fundamentals of electricity; 2) Direct current circuits; 3) Magnetism and magnetic devices; 4) C-c electrical measurements; 5) Condenser; 6) Generation of electromotive force by electromagnetic induction; 7) Aircraft storage batteries; 8) Generator and regulator systems; 9) Ignition wires; 10) Starting systems; 11) Lighting, landing gear, warning, and retracting systems; 12) Wiring systems and 13) Index.  In addition to the narrative and specification tables, this operator's manual includes 7 black and white photographs and approximately 105 black and white illustrations.  This Aircraft Electrical Systems Technical Manual (No. 1-406) is 191 pages and is in very good condition.  Note: this item has the original owner's name written on the inside of the front cover.  Edition published on April 16, 1942.