TM9-1557 M1 ELEV COMPASS WWII. technical manual for the M1 COMPASS for coastal railway guns. This M1 quadrant was used with the M1 railway mount of the large 8 inch coastal artillery seacoast gun mounted on the M1 rail mount.
A harder to find manual for a system not employed in WWII and a leftover of the WWI eras. This M1 quadrant replaced the M1917 model. 15 Pages.
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