Instruments on the Galilee 31 



CRUISE III. DECEMBER 1906 TO MAY 1908. 

 Magnetic Instruments. 



XIX. For magnetic declination at sea. — (1) Ritchie liquid compass 29499, provided 

 with improved azimuth circle 481-III and brass binnacle 319 for use on board ship and 

 tripod for use on shore, all by E. S. Ritchie and Sons; (2) Negus hquid compass 31974 (man- 

 ufactured by E. S. Ritchie and Sons), provided with a Negus azimuth circle and a wooden 

 binnacle for use on board ship, used until August 2, 1907; (3) Ritchie liquid compass 33566 

 with improved azimuth chcle 483-III, all by E. S. Ritchie and Sons, replacing compass 

 31974 on August 2, 1907, provided with brass gunbal-stand 2, by A. W. Dover, for use on 

 board ship, and with tripod 2, by the Department of Terrestrial Magnetism, for use on shore; 

 (4) Kehdn dry compass bowl (13, Pat. 5892) with cards 8127 and 13845, provided with 

 Kelvin azimuth instrument 3619 by the Kelvin and James WTiite Company, mounted on 

 board ship in a wooden binnacle by T. S. and J. D. Negus. The designations adopted, 

 respectively, for the 4 compasses with appurtenances are: R3C, Dl, D2, and K. Ritchie 

 hquid compasses 29971 and 29497 with azimuth cu-cles 387-III and 418-III and binnacle 

 316, all by E. S. Ritchie and Sons, were also carried for possible use in emergency; 29971 

 was used as the steering compass for the vessel. 



XX. For magnetic inclination and total intensity at sea. — (1) Sea dip-circle 35, loaned 

 by the United States Coast and Geodetic Survey, with dip needles 1 and 2, intensity needles 

 3 and 4, and intensity needles 7 and 8 from circle 163 for reserve use, provided with brass 

 gimbal-stand 169 for use on board ship and tripod 169 for use on shore, until August 2, 

 1907, all by A. W. Dover, with modifications as described under the list of instruments 

 for Cruise II (see item XI) ; (2) sea dip-chcle 169, provided with dip needles 1, 2, 5, and 6 

 and intensity needles 7 and 8, and accessories, and mounted on brass gimbal-stand 169 

 when in use on board ship and on tripod 169 for use on shore, aU originally by A. W. Dover 

 and extensively modified and improved by the maker upon the return from Cruise I, in 

 accordance with the specifications of the Department of Terrestrial Magnetism (see 

 pp. 21-23) ; (3) sea dip-cu-cle 189, from August 4, 1907, provided with dip needles 5, 6, 9, 

 and 10, and intensity needle pairs 3 and 4, and 7 and 8, and accessories, and mounted on 

 brass gimbal-stand 169 when in use on board ship, and on one of the land tripods when used 

 on shore, all by A. W. Dover, in accordance with improvements in design and construction 

 specified by the Department of Terrestrial Magnetism (see pp. 21-23). The designations 

 adopted, respectively, for the 3 dip cu-cles are: 35,12S4,| 169.1275, 189.9,10,75 (see pp. 

 28, 30). For cases when both deflection and loaded-dip observations were made, the desig- 

 nation for the intensity needles is followed by a dagger (f), thus, 169.127St- 



XXI. For horizontal intensity at sea. — (1) Sea deflector 1, until August 2, 1907, same 

 as for Ci-uises I and II; (2) sea deflector 2, from August 2, 1907, consisting of special 

 attachments and mountings for the Ritchie azimuth circle 483-III used on Ritchie liquid 

 compass 33566, and provided with deflecting magnets 45, NL, and 2L. The designations 

 adopted, respectively, for the 2 deflectors and compasses are Dl, and D2. 



XXII. For magnetic declination and horizontal intensity on land. — (1) Theodolite mag- 

 netometer 1, provided with tripod 1, to August 2, 1907, by Fauth and Company, extensively 

 modified and altered by the Department of Terrestrial Magnetism; (2) magnetometer 4,^ 

 provided with tripod 4, by the Bausch and Lomb Optical Company, according to specifi- 

 cations of Department of Terrestrial Magnetism. The designations adopted, respectively, 

 for the 2 magnetometers are 1 and 4. (3) Theodolite 3578 with tripod, by C. L. Berger and 

 Sons and loaned by W. J. Peters, was used for auxiliary observations at shore stations. 



XXIII. For magnetic inclination on land. — (1) Land dip-circle 178, provided with dip 

 needles 1, 2, 5, and 6, and intensity-needle pairs 3 and 4, and 7 and 8, compass attachment, 



'The long deflection-bar was lost at Christchurch in January 1908. 



