A 1976 dated Department of the Army issued technical manual titled TM 9-1290-357-10 "Aiming Circle M1 W/E" in good condition overall. The Aiming Circle M1 is a precision optical instrument primarily used by Field Artillery units. It is essentially a surveyor's transit and compass combination used to precisely measure horizontal (azimuth) and vertical (elevation) angles. It is used to orient artillery batteries, lay weapons on the exact azimuth of fire, and establish survey baselines. The manual outlines the operation and maintenance for the circle itself, as well as the Tripod M5, the Instrument Light M2 (for nighttime use), and the Carrying Case M6A1. Bidders are welcome to preview items in person during our normal operating hours Tuesday through Saturday 11am-6pm. Estimated shipping parcel size (LxWxH) 14 inches x 12 inches x 4 inches. Please note, shipping estimates are provided for LiveShipping calculations only and may vary based on weight and location. The auction house will combine multiple lots to reduce shipping cost. Please inform the auction house prior to paying your invoice for special shipping requests. Our primary method of shipping is via UPS Ground.