WWII U.S. Navy SHIPS 251 Preliminary Instruction Book – Navy Model VD-2 Plan Position Indicator Repeater (Confidential)

Description:
Original World War II U.S. Navy Bureau of Ships Preliminary Instruction Book for the Navy Model VD-2 Plan Position Indicator (PPI) Repeater, designated SHIPS 251. Manufactured by Raytheon Manufacturing Company of Waltham, Massachusetts under Navy contract NXsr-36555. Marked Confidential – Non-Registered, this manual covers the operation and maintenance of a repeater display used with naval radar systems to provide additional plan position indicator displays for command, plotting, and combat information functions. The striking red cover and original wartime security markings make this an especially desirable reference manual for collectors of U.S. Navy radar, Raytheon equipment, and WWII electronics.

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