TRANSACTIONS 



OF THE 



SOUTH AFRICAN PHILOSOPHICAL SOCIETY. 



Vol. XIV. 



THE MAGNETIC ELEMENTS AT THE CAPE OF GOOD 

 HOPE FKOM 1605 TO 1900. . 



By J. C. Beattie, D.Sc, and J. T. Morrison, M.A., B.Sc. 



(Eead Alay 29, 1901.) 



^ 1. The first recorded observation of the dechnation at the Cape 

 was made in 1605, the first measurement of intensity abont 1841, the 

 first observation of inchnation or dip in 1751. Other observations 

 have been made at irregular intervals till 1840. In 1841 a detach- 

 ment of R.A. began observations at the Royal Observatory, Cape- 

 town, and carried them on till 1846. This observational work was 

 •continued at the permanent magnetical observatory established in 

 connection with the Royal Observatory of the Cape of Good Hope ; 

 the magnetic work seems to have been discontinued after 1869. 



In recent years observations have been taken by the magnetic 

 ■observers attached to various expeditions. In addition to these, 

 yearly observations are taken at the Royal Observatory, Capetown, 

 by Messrs. Beattie and Morrison 'with a set of field-instruments 

 (Kew pattern) obtained by Sir David Gill in 1894. 



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