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FURTHER MAaNETIC OBSERVATIONS IN SOUTH AFRICA 
DURING THE YEARS 1918-1915. 
By J. C. Beattie, D.Sc, Professor of Physics, South African College, 
Cape Town. 
(Read October 20, 1915.) 
The results'*^ given in this paper were calculated from observ-ations made 
at different stations in the Orange Free State, Transvaal, and the Cape 
Provinces. In earlier work in these regions certain parts had not been 
touched, and it was found difficult to draw the magnetic lines with accuracy 
until more stations were occupied. 
The method of taking the observations has already been fully described 
in other communications. t The magnetic instruments were magnetometer 
73 (Elliott Bros.) ; dip-circle 142 (Dover). The chronometer employed was 
No. 1048 (Reed and Son). A 5-in. theodolite, No. 6084 (T. Cooke and 
Sons) , was used for the determination of latitude, longitude, and the azimuth 
required for the calculation of the magnetic declination. 
The reductions have been carried out by Mr. W. H. Finlay, M.A., to 
whom I again wish to express my thanks for the care he has given to this 
part of the work. 
The values given for the various elements are those obtained from the 
observations. No correction for secular or daily variation has been intro- 
duced, nor has any instrumental correction been employed. 
* The writer has gratefully to acknowledge grants from the Royal Society of 
South Africa and from the Education Department of the Union towards the expenses 
of the work. 
t " Eeport of a Magnetic Survey of South Africa," by J. C. Beattie, London, 1909, 
Appendix, p. 12. " Further Magnetic Observations in South Africa." Transactions 
of the Eoyal Society of South Africa, 1914, vol. iv, part 1, p. 11. 
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