390 Appendix B 



not over fifteen pounds in weight. It should have a good 

 prism eyepiece with an angle tube attached so it would 

 not be necessary to break one's neck in reading high 

 altitudes. For days we travelled in the direction the sun 

 was going, with altitudes varying from 88° to 90°. Be- 

 cause of these high altitudes of the sun the sextant with 

 artificial horizon could not be used unless one depended 

 upon star observations altogether, an uncertain depend- 

 ence because of the many cloudy nights. 



Barometers. — The Goldsmith form of direct-read- 

 ing aneroid is the most accurate portable instrument and, 

 of course, should be compared with a standard mercurial 

 at the last weather-bureau station. 



Thermometers. — A swing thermometer, with wet 

 and dry bulbs for determination of the amount of mois- 

 ture in the air, and the maximum and minimum ther- 

 mometer of the signal-service or weather-bureau type 

 should be provided, with a case to protect them from 

 injury. 



A tape measure with metric scale of measurements 

 on one side and feet and inches on the other is most 

 important. Two small, light waterproof cases could be 

 constructed and packed with scientific instruments, data, 

 and spare clothing and yet not exceed the weight limit 

 of flotation. In transit by pack-train these two cases 

 would form but one mule load. 



Photographic. — From the experience gained in sev- 

 eral fields of exploration it seems to me that the voyager 

 should limit himself to one small-sized camera, which he 

 can always have with him, and then carry a duplicate of 

 it, soldered in tin, in the baggage. The duplicate need 



