358 APPENDIX B 



observations altogether, an uncertain dependence because of the 

 many cloudy nights. 



Barometers. — The Goldsmith form of direct-reading 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 moistm'e in the air, and the 

 maximum and minimum thermometer of the signal-service or 

 weather-bureau type should be provided, with a case to protect 

 them from injury. 



A tape measm'e 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 several 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 not be equipped with as expensive a lens and shutter 

 as the camera carried for work ; 3| x 4J is a good size. Nothing 

 larger than 3J x 5 J is advised. We carried the 3A special Kodak 

 and found it a light, strong, and effective instrument. It seems to 

 me that the ideal form of instrument would be one with a front 

 board large enough to contain an adapter fitted for three lenses. 

 For the 3i x 4 J : 



The camera should be made of metal and fitted with focal-plane 

 shutter and direct view-finder. 



A sole-leather case with shoulder-strap should contain the camera 

 and lenses, with an extra roll of films, all within instant reach, so 

 that a lens could be changed without any loss of time. 



Plates, of coui-se, are the best, but their weight and frailty, with 



