^{page 631 note *} Wied. Ann., xvii. p. 928 (1882)Google Scholar.

^{page 631 note †} Phil. Mag. (5), vol. xxxvii. p. 95 (1894)Google Scholar.

^{page 631 note ‡} Electrician, “Magnetic Shielding,” vol. xl. pp. 218, 316, 511, 652, 814, and vol. xli. p. 108 (1897–98).

^{page 632 note *} Electrician, vol. xxxix. p. 190.

^{page 632 note †} Scientific and Technical Papers of Werner von Siemens. English edition, vol. i. pp. 353 to 372 (1892).

^{page 632 note ‡} Wied. Ann., xxiv. p. 663 (1885)Google Scholar.

^{page 632 note §} “On the Permeability of Iron at Right Angles to the Direction of Magnetisation,” Electrician, vol. xxv. pp. 111, 141 and 158.

^{page 632 note ∥} Proc. R.S.E., vol. xviii. p. 124.

^{page 632 note ¶} Magnetic Induction in Iron, Ewing, 3rd ed., p. 330.

^{page 632 note **} American Journal of Science, vol. clxi. p. 365(1901)Google Scholar.

^{page 634 note *} The longitudinal field is also obtained from the known ampère turns per cm. of length, but is not the true value of H acting in the iron, as the demagnetising factor iR considerable.

^{page 637 note *} Du Bois, , Electrician, “Magnetic Shielding,” vol. xl. p. 815(1898)Google Scholar. Fig. x. shows the relation between the shielded field and the true magnetising force in the iron at the position of maximum induction.

^{page 639 note *} See §54; also §§30–37 on Magnetic Æolotropy of Demagnetised Iron.

^{page 640 note *} See footnote on following page.

^{page 641 note *} These letters refer to the circular mid longitudinal fields respectively. The order in which they occur signifies the order in which they are superposed the one upon the other. Thus “CL conditions” means that the circular field H_c acts first upon the iron, and the longitudinal field, second. “LC conditions” has, necessarily, the opposite signification. CC and LL mean that the circular and longitudinal fields respectively are repeatedly reversed. § 38 may be referred to. The definitions there given are immediately applicable, by substituting L (longitudinal field) for T (transverse field).

^{page 647 note *} American Journal of Science, vol. clxi. p. 365, 1901Google Scholar.

^{page 647 note †} “Magnetic Induction in Iron,” Ewing, 3rd ed., p. 332, 1900.

^{page 648 note *} Phil. Trans., “A Magnetic Detector of Electric Waves,” vol. clxxxix., 1897Google Scholar.

^{page 648 note †} Paper read before Royal Society 12th June 1902, and entitled “A Magnetic Detector of Electric Waves which can be employed as a Receiver for Space Telegraphy.”

^{page 654 note *} It is of interest to observe that it lias also been noted that the amount of twist produced in an iron wire by a given combination of circular and longitudinal magnetisms, depends largely upon the order in which these are applied. See “Magnetism and Twist in Iron and Nickel,” by Dr Knott, , Trans. R.S.E., vol. xxxvi. p. 490, 1891Google Scholar.

^{page 655 note *} Electrician, “Magnetic Shielding,” vol. xl. p. 654 (1898)Google Scholar.

^{page 657 note *} In fig. XXXVII. “shield B” should read “shield A”; and in fig. xxxi. “shield A” should read “shield B.” See Plate 5.

^{page 659 note *} Magnetic Inductions in Iron, 3rd edition, p. 330.

^{page 660 note *} Electrician, vol. xl. p. 513.