Vintage Felsenthal military artillery slide rule designed for calculating high-angle firing solutions for the 155mm howitzer. This specialized ballistic computing instrument is marked “HOW 155mm HIGH ANGLE” and dated “OCT 72,” indicating military production during the Cold War era.

Constructed of laminated wood with a clear plastic sliding cursor, this field instrument features printed scales for Range, Elevation, Tow Site, Drift, and Charge, allowing artillery crews to quickly determine firing adjustments before the widespread use of electronic fire-control systems.

An excellent collectible for military historians, artillery enthusiasts, surplus collectors, or anyone interested in Cold War-era U.S. Army equipment.

Features:

* Vintage Felsenthal military artillery slide rule

* Designed for 155mm Howitzer high-angle firing solutions

* Marked “HOW 155mm HIGH ANGLE”

* Dated October 1972

* Laminated wood construction

* Clear plastic sliding cursor

* Printed ballistic scales for Range, Elevation, Tow Site, Drift, and Charge

* Cold War-era U.S. military field instrument

* Shows normal age-related wear, discoloration, and field markings

* Sold exactly as pictured

Please review all photos carefully for cosmetic condition before purchasing.