GO 



REPORT ON 



The values of the Vertical and Total Force have been computed from the horizontal 

 force and inclination by the formulae 



Z = X tan 



where 



JT= horizontal component of the earth's magnetic force. 



Z = vertical component of the earth's magnetic force. 

 R = total magnetic intensity. 

 6 = magnetic inclination. 



All values of force are expressed in English units; namely, in terms of grains, 

 feet, and seconds. If it is desired to have them in metric units, expressed in 

 terms of milligrams, millimeters, and seconds, they must be multiplied by 0.46108. 



The observations of magnetic declination, inclination, and force are given in 

 full at the end of this section, but for convenience of reference the following 

 abstract of them is inserted here. 



