NIPHER MAGNETIC DETERMINATIONS IN MISSOURI, 79- ^^3 



Station 23 c—Maryville. On prairie 225 yds. N.W. of Station a and 

 325 yds. from the track. Meridian deduced from Station a. 



Station 16 b—Sedalia, Petti:, Co., Mo. Lat. 38° 42' .3 ; Lon. 93° 15' .5 

 The meridian observations were made in the yard of Mr. A. D. Jaynes, 

 all magnetic observations being made in a vacant square to the S. and 

 owned by E. J. Payn ; observations midway between Ninth st. and the 

 alley, and on the W. side of the lot. The nearest piping is a 12-inch 

 water main, with a 4-inch gas main on Ohio st., one block E. of the 

 instruments. The observations of 1S7S were made within 25 ft. of this 

 main, and were certainly influenced by it. 

 Station ia^ a—'}efftrson City, Cole Co., Mo. Lat. 38" 34'. «; Lon. 92° 

 09'. 0- Observations in State-house yard, on the terrace below the general 

 level of the yard. Track of the Mo. Pacific Ry. 100 yds. N.E. ; centre 

 of State-house front 67 yds. N.W. No influence from locomotives and 

 trains, although the trial was made with the needles free and damped 

 with glycerine, and with the train running slowly, and at full speed, as 

 well as when standing to the N.E. One train thus tried contained six 

 cars loaded with railroad iron. Due E. 115 yds., was a foundry and ma- 

 chine shop, which was not discovered until after the observations were 

 begun, although inquiry was made for such causes of disturbance. The 

 owner of the foundry estimated the total amount of iron about his place 

 at 20 to 30 tons. It is, therefore, quite certain that the foundry was 

 far enough away, nevertheless its proximity is to be regretted. The 

 State-house is heated by stoves, and contains no iron. Polaris obser- 

 vation for meridian. Intensity was determined by an oscillation series, 

 the number of oscillations being observed by Mr. Chas. F. Jorden, 

 time being taken by myself, owing to the temporary absence of Mr. 

 Shaub. 

 Station 24 h — yrferson City. 66 yds. S.W. of the State-house, nearly 

 in line with its front, and 83 yds. from the centre of the Arsenal, which 

 contains 5 tons of iron. Polaris observation and complete intensity 

 determination were made here. 

 Station 24 c— Jefferson City. Observations made on a sand-bar in the 

 middle of the river and half a mile above the State-house. The inten- 

 sity was determined by a careful oscillation series, the magnetic meri- 

 dian by a single reading of needle No. i at 8:30 o'clock a.m., and the 

 true meridian by the triangle formed by the mark and Stations b and 

 c. The uncertainty of this declination is certainly not over 7', and is 

 probably less. 

 Station 24 d— Jefferson City. A little less than a mile from the State- 

 house, in the peach orchard of Philip Chappell. Centre of State-house 

 dome bears N. 4° 31'. 9 E Complete determinations made here, the me- 

 ridian being determined by polaris observations. 



Station 25 — Washington, Franklin Co. Lat. 38° 31' -2 ; Lon. 90° sS'.g 



