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An instrument has been designed and built to permit the measurement of the magnitude and direction of the magnetic dipole moment in a one-inch cubical rock specimen while the specimen is in a furnace. The measurement is obtained by giving the specimen a linear vibration at 40 c.p.s. and surrounding the furnace with a specially designed array of coils. Each of the three mutually perpendicular components of the dipole moment induces a voltage in the coils. By rearranging the interconnection of the coils, outputs proportional to any component may be obtained. This apparatus has a theoretical sensitivity to magnetization of about 4 × 10−5 e.m.u. (per cc). The actual sensitivity approached this but was limited by external electrical interference.