204 Ocean Magnetic Observations, 1905-16 



and K; (4) Ritchie liquid compass 29971, provided with a brass binnacle-stand, by E. S. 

 Ritchie and Sons, was used as a steering compass for the vessel; (5) Ritchie Uquid compass 

 29499, and (6) Ritcliie hquid compass 29497, the latter with its card ungraduated except 

 for the 4 cardinal points, with azimuth circles 418-III and 481-III, all by E. S. Ritchie and 

 Sons, were carried for reserve and experunental use. 



II. For magnetic inclination and total intensity at sea. (1) Sea dip-ckcle 189,^ provided 

 with dip needles 5, 6, 9, and 10, intensity-needle pau-s 3 and 4, and 7 and 8, brass gimbal- 

 stand 2 (maker's number 189) for use on board ship, and tripod for use on shore, all by 

 A. W. Dover, with unprovements in design and construction specified by the Department 

 of Terrestrial Magnetism; (2) sea dip-circle 203, a reserve instrument, provided with dip 

 needles 1, 2, 5, 6, 9, and 10, and mtensity-needle pairs 3 and 4, 7 and 8, and 11 and 12, 

 brass gimbal-stand 3 (maker's number 208) for use on board ship, and tripod 203 for use 

 on land, all by A. W. Dover, with improvements in design and construction as specified by 

 the Department of Terrestrial Magnetism. The designations adopted, respectively, for 

 the two dip circles are the numbers of the dip circles followed by nmiibers of needles used, 

 mtensity-needle numbers being italicized, thus: 189.9,10,75. When both deflection and 

 loaded-dip observations were made the designation for the intensity needles is followed 

 by a dagger (t), thus, 189.9,10,7St. ^ . , ^ . . ^ u 



III. For horizontal intensity at sea. (1) Sea deflector 3, designed and constructed by 

 the Department of Terrestrial Magnetism, provided with deflecting magnets 45 and 2L, 

 brass binnacle-stand by E. S. Ritchie and Sons for use on board ship, and tripod 1 for use 

 on shore. The designation adopted for the deflector and compass is D3. 



IV. For magnetic declination and horizontal intensity on land. (1) Theodohte magnet- 

 ometer 2, provided with tripod 2, by the Bausch and Lomb Optical Company according 

 to specifications of the Department of Terrestrial Magnetism; (2) theodohte magnetometer 

 4 2 provided with tripod 4, by the Bausch and Lomb Optical Company, and similar to 

 magnetometer 2. The designations adopted, respectively, for the two magnetometers are 



2 and 4. -j a ■ u a- 



V. For magnetic inclination on land. (1) Land dip-cu-cle 178, provided with dip 

 needles 1, 2, 5, and 6, mtensity-needle pair 3 and 4, compass attachment, and tripod, all by 

 \ W Dover- (2) land dip-ckcle 201, provided with dip needles 1 and 2, intensity-needle 

 pair 3 and 4, compass attacliment, and tripod 201, all by A. W. Dover. The designations 

 adopted respectively, for the two dip circles are 178.25 and 201.12 (the mtensity needles 

 and the extra dip needles were not used) . (3) Sea dip-circles 189 and 203 with their needles 

 and compass attachments were also used for shore observations. 



Atmospheric-Electbic Instruments. 



VI. Instruments for observations in atmospheric electricity. (1) Conductivity apparatus 

 2 complete with accessories, Gerdien's design, by Spindler and Hoyer; (2) Harm's standard 

 condenser 1693, by Giinther and Tegetmeyer; (3) dispersion apparatus 1416, Elster and 

 Geitel's design, by Gunther and Tegetmeyer, provided with electroscope 1416, dry-pile 

 1408 tripod 1309, and accessories; (4) electroscope 1437 by Gunther and Tegetmeyer; (5) 

 misceUaneous equipment, includmg dry-pile 1449, special insulators, ionization chamber 1, 

 aluminum foil, etc. 



Sextants, Chronometers, Watches, and Dip-of-Horizon Measurer. 



VII. Sextants. (1) Nos. 2575, 2611, 2943, and 2944, by Ponthus and Therrode (the 

 last two instruments are specially designed for use at night) ; (2) No. 3265 by C. Plath; (3) 

 Nos. 10756 and 10759 b y the Keuffel and Esser Company; (4) unnumbered sextant by 



'Dip circle 189 waa thoroughly overhauled and repaired during June to July, 1909, in the shop of the Department of 

 "^'"'Setomet'erTwa. mipplied with a new long deflection-bar prior to its assignment for Cruise I of the Can^gie. 



