32 Ocean Magnetic Observations, 1905-16 



and tripod 178, all by A. W. Dover; (2) land dip-cu-cle 171 from March 9 to May 24, 1907, 

 provided with dip needles 1 and 2, 5 of circle 172, and 6 of circle 172, intensity-needle pair 

 3 and 4, compass attachment, and tripod, all by A. W. Dover. The designations adopted, 

 respectively, for the 2 dip-circles are 178.1256 and 171.12 (the intensity needles and extra 

 dip needles were not used) ; (3) sea dip-circles 35, 169, and 189, with their needles and com- 

 pass attachments, were used also for shore observations. 



Atmospheric-Electric Instruments. 



XXIV. Instruments for ohservaliom in atmospheric electricity beginning August 4, 

 jg07,—{i) Conductivity apparatus 1, complete mth accessories, Gerdien's design, by 

 Spindler and Hoyer; (2) dispersion apparatus 1394, Elster and Geitel's design by Giinther 

 and Tegetmeyer, complete with electroscope 1417, dry-pile 1408, and accessories; (3) ion 

 counter 1455, Ebert's design, by Gunther and Tegetmeyer, complete wath electroscope 1443, 

 dry-pile 1410, and accessories; (4) potential-gradient apparatus consisting of electroscope 

 987, Exner's design, with flame collector, Elster and Geitel's design, and accessories, by 

 Gunther and Tegetmeyer; (5) radioactivity apparatus 1432 for soil and water, Elster 

 and Geitel's design, complete with electroscope 1416, and accessories by Gunther and 

 Tegetmeyer; (6) radioactivity apparatus for air, including electroscope 1437, dry-pile 

 1449, and accessories by Gunther and Tegetmeyer; (7) voltmeter 4381 model 45 by the 

 Weston Electrical Instrument Company; (8) miscellaneous equipment, including induction 

 coil with condenser, insulators, tripod, brass gimbal stand 2, etc. 



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



XXV. Sextants.— {1) Nos. 2575, 2611, and 2617 by Ponthus and Therrode; (2) Nos. 

 10756 and 10759 by the Keuffel and Esser Company ; (3) No. 3265 by C. Plath ; (4) unnum- 

 bered sextant by L. Weule; (5) gyi-oscopic colhmator and octant 2679 complete with acces- 

 sories, by Ponthus and Therrode, from March 7, 1907. 



XXVI. Chronometers and ivatches.—(l) Marine chronometers 254 by A. Kittel, 264 

 by A. Kittel, 1809 by T. S. and J. D. Negus, loaned by W. J. Peters, 2761 by G. E. Wilkins, 

 53157 by E. Dent and Company, 53862 by E. Dent and Company, with ehip and gimbal 

 cases; (2) pocket chronometers 231 by A. Kittel from March 9 to May 24, 1907, 241 by A. 

 Kittel from September 6, 1907, 244 by A. Kittel, 253 by A. Kittel to August 7, 1907, for 

 shore use; (3) watches 2 by the Hamilton Watch Company, 3 by the Hamilton Watch 

 Company from March 9 to May 24, 1907, and deck watch 54672 by E. Dent and Company. 



XXVII. Dip-of-horizon weaswrer.— Dip measurer 4048, model A, by Carl Zeiss, from 

 March 11, 1907. 



Meteorological Instruments and Miscellaneous Equipment. 



XXVIII. Meteorological instruments. — Same as for Cruises I and II, with the addition 

 of the following: (1) Marine mercury barometer 3948, EngUsh scale, by H. J. Green; 

 (2) Marvin sling psychrometer, centigrade scale, thermometers 8186 and 8189 by H. J. 

 Green (broken during cruise) ; (3) thermograph 39804 by Richard Freres, to August 2, 1907; 

 (4) thermograph 40418 was returned for repairs on July 30, 1907, and was replaced by 

 thermograph 46032 by Richard Freres on August 31, 1907; (5) 6-inch thermometers, 

 centigrade scale, 4823, 8828, 8835, 8837, 8840, aU by H. J. Green. ,.■■ . 



XXIX. Miscellaneous equipment.— Same as for Cruises I and II, with the addition of 

 the following: (1) Artificial horizon, by L. Weule; (2) three-arm protractor 10031, by the 

 Keuffel and Esser Company; (3) stereoscopic glasses, by Ponthus and Therrode; (4) special 

 non-magnetic wall tents, 9 feet by 9 feet, for shore work. 



