"This instruction memorandum is published pending inclusion of pertinent material in a revision of FM 6-40. The compass, M2 is for use in measuring azimuths, either Y or magnetic, for which purpose it employs a magnetic needle. It is also equipped with a clinometer, by means of which vertical angles in mils (angles of site) may be measured; for this purpose it employs a tubular level. It is provided with a carrying case, M19."--Page 1.

Cover title. At foot of title: For Use in Resident Instruction at the Field Artillery School only, (pending its inclusion in revision of FM 6-40)

General --Compass, proper -- Declinating the compass -- Use of the declination constant -- Measuring an azimuth -- Measuring a vertical angle -- Use as a clinometer and for running levels -- Care.