114 Land Magnetic Observations, 1911-13 



Mr. Holtze, in charge at Daly Waters, entertained us most hospitably while we were 

 there and provided us most liberally with food from his own supply. Stores are sent to 

 these stations only once a year, so that it is difficult to replace any. He was also very kind, 

 as above noted, with regard to the dray and horses, giving us the best available at some risk 

 of inconvenience to hmiself. At Katherine I met the Achiiinistrator of the Northern Ter- 

 ritory and had several conversations with liim. Through his good offices every courtesy 

 was shown the expedition by officials here and at Batchelor and Port Darwin. 



P^rom Katherine we traveled bj' the weekly mail-coach to Pine Creek, arriving on 

 September 9. On this trip I had my only indisposition, a "touch of sun," I think, which 

 made me feel very sick for several days. From Pine Creek, Port Darwin was reached by 

 railway on September 17. I occupied one station on the coast to the east of Port Darwin, 

 taking advantage of permission to accompany a launch trip organized by the Govern- 

 ment. On October 1, a continuous 24-hour set of declination observations for diurnal 

 variation was completed at Port Darwin. 



Between Oodnadatta and Port Darwin, 39 magnetic stations were established at an 

 average distance apart of about 35 miles. Veiy little local disturbance is indicated by the 

 magnetic results, the total range m declination being less than one degree. Stars were 

 used to a considerable extent for the astronomical observations. Dip circle No. 172 was 

 found somewhat troublesome, ffi'st one needle then another developing a large correction. 



A. D. Power, on Magnetic Work in Peru, Ecuador, Panama, Venezuela, Colombia, 

 West Indies, Brazil, and British Guiana, June 1912 to December 1913. 



The work reported on below was done in accordance with the instructions of June 27, 

 1912, October 11, 1912, and August 4, 1913. The instrumental outfit consisted of magnet- 

 toineter No. 16, dip circle No. 177, observing-tent No. 21, pocket chronometer No. 257, 

 small box-chronometer No. 677, Howard watches Nos. 804 and 811, and accessories. At 

 Caracas instruments No. 16 and No. 177 were replaced by the universal magnetometer No. 

 21, intensity needles Nos. 19 and 20 being used as regular dip needles. Also watch No. 804 

 was replaced by No. 103. 



Leaving Washington and New York on June 29, 1912, I arrived at Mollendo, Peru, via 

 Panama, on the following Julj' 19, where I reported to the chief of party, Mr. J. P. Ault. 

 At Arequipa I received my instmmental outfit and spent several days there, receiving 

 instruction and taking part in the intercomparisons of instruments. My actual field work 

 began at Mollendo on August 1. 



Nos. 1 to 15, inclusive, of the following complete list of stations, were occupied while 

 I was a member of Mr. Ault's party. Thereafter, in accordance with instructions, I pro- 

 ceeded as an independent party. 



1912. I 1912. 



1 . Mollendo, Peru Aug. 2. ! 15. Esmeraldas, Ecuador Oct. 10, 11. 



2. Chala, Peru Aug. 6. | 16. Colon, Panama Oct. 25. 



.3. lea, Peru Aug. 10. 17. Caracas, Venezuela Nov. 7-10. 



4. Pisco, Peru Aug. 8, 13. IS. Turmero, Venezuela Nov. 16. 



5. Huacho, Peru Aug. 18. 19. Puerto Cabello, Venezuela Nov. 19. 



6. Lima, Peru Aug. 21. 20. Aroa, Venezuela Nov. 23. 



7. Chimbote, Peru ^ Aug. 26. ' 21. Barquisimeto, Venezuela Nov. 26. 



8. TrujiUo, Peru Aug. 29. 22. Tocuyo, Venezuela Nov. 29. 



9. Ascope, Peru Sept. 1,2. 23. Carache, Venezuela Dec. 4. 



10. Chilete, Peru '. Sept. 7. ' 24. Trujillo, Venezuela Dec. 9. 



11. Pacasmayo, Peru Sept. 5, 9. 25. Sabana de Mendoza, Venezuela Dec. 14. 



12. Chielayo, Peru Sept. 13. 20. La Ceiba. Venezuela Dec. 17. 



13. Piura, Peru Sept. 19. 27. Maracaibo, Venezuela Dec. 20. 



14. Paita, Peru Sept. 22. ' 28. Puerto Villamizar, Colombia Dec. 26. 



