Gyros are the fundamental technology behind innertial navigation systems, stabilized instrument platforms, and weapon(s) stabilization systems. "Synchro" is the name given to a variety position-sensing and synchronizind devices that can be found in just about every weapons system in the US Navy. Servo-systems use a small control signal to remotely operate or position a heavy mechanical load, as in weapons directors, navigation control surfaces, and antennals. This complete volume incudes lessons on the operation and design of synchro systems, servo-systems, gyroscopes, and accelerometers. It includes many high quality illustrations that were painstakinglyrecovered from the original documents This would be a invaluable addition to the bookshelf of any robot maker, science buff, or Tom Clancy fan. Materials are from a US Military produced course designed for introducing US Marines and Sailors to technical subjects while not assigned to Training Commands, abridged and reformated by a US Navy Veteran for viewing on digital devices.