NIPHER — MAGNETIC OBSERVATIONS IN MISSOURI, 1 878. 81 



Report on Magnetic Observations in Missouri, Summer 



of 1878. 



By Francis E. Nipher, Professor of Physics 

 in Washington University. 



In connection with meteorological work done under my direc- 

 rection, it was deemed of importance to determine the elements 

 of terrestrial magnetism for various points in Missouri. Being 

 aided by the kind cooperation of the U. S. Coast Survey, the 

 summer of 187S was devoted to this work. 



The following is a list of the instruments and appliances taken 

 with us : 



I Portable Declinometer and stand. 



1 Five-inch Altitude and Azimuth Instrument. 



I Intensity Magnet, marked Cg. 



I Smaller " " C^y. 



I Dip Circle, with two Needles 9^ inches long. 



1 Lloyd's Needle. 



2 Eleven-inch Bar Magnets. 



I Watch, Jurgensen, No. 10S90. 

 I Wall Tent, 5X7 feet base. 



These articles, with the exception of the last two named, were 

 furnished by Prof. J. E. Hilgard, of the Coast Survey. 



I was accompanied by Messrs. J. W. Shaub, F. Nicholson, and 

 L. H. Ritterskamp, students of Washington University. 



The observations on dip were nearly all made by Messrs. 

 Nicholson and Ritterskamp, these gentlemen taking turns in ob- 

 serving and recording. 



The observations for meridian were all made by myself, the 

 time being determined and record made by Mr. Shaub. 



In the observations for intensity, nearly all the observations on 

 the magnet scales were made by myself, Mr. Shaub taking time 

 and making the record. 



Determinations of latitude and longitude were made from the 

 Land Office map, by means of the county and section lines. 



The calculations for declination were made independently by 

 Mr. Shaub and myself, and the reduction for dip, made by Nich- 

 olson and Ritterskamp, was afterwards revised by Mr. Shaub 

 and myself, 

 iv — 6 



