. The London, Edinburgh and Dublin philosophical magazine and journal of science. 200° 400° 600° Temperature. 100o° c. and Electrical Resistance of Iron. 253 17. •2 60000 ^S cq Resistance- Temperature specimen A. (Grit. temp. 795° C.) Curve I. Before annealing. Curve II. After annealing at 1050° C. j ,-ro 0 • //^ 0 // / i ?^ / ? • o°c. 200° 400° 600° Temperature. 800° 1200° C. 254 Magnetic Properties and Electrical Resistance of Iron. Resistance-Temperature Iron specimen B. (Grit, temp. 780° C.) Curve I. After annealing at 840° 0. Curve II. After annealing at 1150° 4
. The London, Edinburgh and Dublin philosophical magazine and journal of science. 200° 400° 600° Temperature. 100o° c. and Electrical Resistance of Iron. 253 17. •2 60000 ^S cq Resistance- Temperature specimen A. (Grit. temp. 795° C.) Curve I. Before annealing. Curve II. After annealing at 1050° C. j ,-ro 0 • //^ 0 // / i ?^ / ? • o°c. 200° 400° 600° Temperature. 800° 1200° C. 254 Magnetic Properties and Electrical Resistance of Iron. Resistance-Temperature Iron specimen B. (Grit, temp. 780° C.) Curve I. After annealing at 840° 0. Curve II. After annealing at 1150° 400° 600° Temperature. [ 255 ] XXXIIT. Doublets and Triplets in the Spectrum produced byExternal Magnetic Forces.—(II.)* By Dr. P. ZEEMANf. 13. Magnetic Triplet.—With the grating of § 8 and witha very strong current and rightly-shaped conical poles Isucceeded in observing also the pure triplet (§ 5) with cad-mium. Again the blue cadmium line was examined which Ihave used for the other characteristic phenomena. The fieldused was about 32,000 Using this strong field andlooking without a nicol across the lines of force the cadmiumline was seen tripled, i. e., broken up into three lines, separatedby dark spaces. The existence of this triplet demonstrates, asit seems to me, irrefragably, and independently of the exami-nation of the state of polarization, the magnetic nature ofthe phenomenon. If now a nicol is placed in the rays with its plane ofpolarization horizontal, then only the two outer lines of thetriplet are seen. A rotation of the nicol over 90° makesappear the ce
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