U\ 



CATALOGCE. — MAGNETIC AL APPARATUS. 



Strength of Knight's magnets. Ph. tr. 1744. 



XLIII. 161. 

 Knighton the poles of magnets. Ph. tr. 1745. 



XLIII. 361. 

 Mitchell on artificial magnets. 8. Lond. 1750. 



Cambr. 1751. M.B. 

 Canton's method, with Folkes's report. Ph. 



tr. 1751. 31. 

 Klingatstierna el Brander de magnetismo ar- 

 tificial!. Stoch. 1752. 

 liiviere sur les aimansartificiels. Par. 1752. 

 Richmann on malving magnets. N. C. Petr. 



IV. 235. 

 Wenlz on artificial magnets. Act. Helv. II. 



264. 

 Nebel de magnete artificiaii. 4. Utr. 1756. 

 Antheauime. A. P. 1753, 1761. 

 jintktaulme sur les aimans artificiels. Par. 



1760. 

 Le Noble's artificial magnets. A. P. 1772. i. 



H. 17. 

 Lemonnier Loix du niagnetisme. 

 Fothergiil oq Knight's machine. Ph. tr. 



1776. 591. 

 Fuss on artificial magnets. A. Petr. II. ii.H. 



35. Roz. 1782. 

 On artificial magnets. Roz. IX. 454. 

 Wilson on Knigiit's artificial loadstones. Ph. 



tr. 1779-51. 



Made of elutriated iron filings, and linseed oil. 



E. ]M. A. VI.694. 

 E. M. Piiysique. Art. Aimant. 

 Ingenhousz's paste. Venn. Schr. 1.409. 

 Brisson on the best steel for magnetical uses. 



A. P. 1788. 169. Repert. III. 276. 



Cast steel bad. English or German best. 

 Tremery on elliptic magnets. B. Soc. Phil. 



n. 6. 

 A complex horseshoe magnet. Isich. 8. V. 



216. 



Sjostcen on making magnets. Gilb. XVIF. 



325. 



Touching them in a cirde. 



A bar rubbed from both ends to the middle, has both 

 ends of the same quality with the pole employed ; the mid- 

 dle of the contrary quality. 



Oil somewhat impedes the communication of mag- 

 netism. Robiscn. 



Compasses and dipping Needles. 



See Navigation. 



Lahire on an annular needle^ Ph.tr. I6B6. 



XVI. 344. 

 Lahire's variation compass. A. P. 1716.6. 

 Mean's compass. A. P. 1731. H. 92. 

 Buachc's compass. A. P. 1732. 377. 



For the dip and declination. 



Quereineuf's azimuth compass. A. P . 1734. 



11.105. Mach.A.VII. 3. 

 Middleton's azimuth compass Ph. tr. 1738. 



XL. 395, 

 With a telescope. 

 Lemaire's variation compass. A. P. 1747. H. 



126. Mach. A. VII. 361. 

 Magny's compass. A. P. 

 Bernoulli on dipping needles. A. P. Prix. V. 



viii. Act. Helv. III. 233. 

 Trombelli and Collina on the invention of 



the compass. C. Bon. II. iii. 333,372. 

 Knight.Ph.tr. 1749. iii. 



Rhomboidal needles are bad. 



*Kuight's compass, with Smeaton's remarks. 



Ph. tr. 1750. 505, 513. 

 Duhamel on the improvement of the com pass. 

 . A. P. 1750. 154. H. 1. 1772. ii. 44. H. 58. 

 Zeiher's needle and compass. N. C. Petr. 



VII. 309. VIIL 284. 

 Kotelnikovv's suspension for a needle. N. C. 



Petr. VIII. 304. 

 Nairneon Mitchell's dipping needle. Ph. tr. 



1772. 476. 



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