5.— KEPORT ON THE RE8ULT8 OF A MAGNETIC SUR- 

 VEY OF THE CLANWILLIAM, VAN RHYN8D0RP 

 AND CALVTNIA DISTRICTS. 



By J. C. Brattie, D.Sc. 



With the help of grants from the British Association and the 

 South African Association for the Advancement of Science, a survey 

 of the above districts was carried out in January and February of 

 1907. Observations were made at nineteen stations. The magnetic 

 elements determined were the declination, the dijj and the horizontal 

 intensity. The instruments used were — magnetometer No. 73, by 

 Elliott Brothers, the property of the London Royal Society, and dip 

 circle No. 142, b}- Dover. The latitude and the longitude were 

 determined by observations on the sun with a five-inch theodolite, 

 also the propert)' of the London Royal Society ; the chronometer 

 used was No. 1048, by Reid & Son. 



These instruments had been vised in the other magnetic work 

 carried on during recent years in South Africa. A full account of 

 the methods employed in using them, of the accurac}' of the results 

 and the processes in the reduction are given in the jRfiporf of a 

 JMagnetic Survpy of South Africa (Cambridge Scientific Press), by the 

 present writer. 



In the accompanying table the results obtained at the \arious 

 stations are civen : — 



I'r-AtK. 



Ecvidekuil 



De Ivniis 



Modderfoiitein 



Augshuru 



I>nlslif>ek 



Doom Kiver B. Hot 



Wiiidliofk 



^1/1/07 



2-2/1/07 



(;roct(hift 



Wilk'in's Kiver 



Leenwriet 



Hohiver 



Karreelioscli 



Downies 



Oorlogskloof 



Kantioc 



Doondiuscli 



IU'\ I\i\er 



bAT. 



32 40 -OS 



82 :r)-> 



32 3()-3 



32 10 -2 



31 r)8-6 



31 52-1 



31 44-4 



31 29-3 



31 28-7 



31 28-2 



31 20-,-. 



31 28-3 



31 21 it 



31 34-7 



31 30-3 



31 3U{1 



31 44(» 



31 r)8-0 



.32 27 



Long. 



18 52 -oE 

 18 45 -0 

 18 5«)(» 

 18 54 (t 

 18 47-8 

 18 .->0-5 

 18 38-8 

 18 44-4 

 18 ,')(l-0 



18 .15 -4 

 10 5-8 

 Ml l!>-8 

 1!» 311 

 1!» 42J) 

 |{» 52-8 



19 2(>(> 

 19 Hi -8 

 19 15-0 

 18 ,57 O 



Dkclina- 



TION. 



42 nv 



34-8 

 41-9 

 39-7 

 29-(> 

 15-8 

 29-7 

 38-7 



26 



27 42-8 



27 23-4 



27 20 (i 



28 12-8 

 27 2(»-4 

 27 18-0 

 27 2()-8 

 27 140 



27 38-5 



1)11' 



59 12 -OS 



.59 10-9 



59 9-8 



.59 l-I 



58 ,50-8 



58 45-9 



,58 25-9 



58 35-0 



58 41-9 



.18 4(i-8 

 58 ,57-0 

 .19 ({•9 

 9-4 

 0-5 

 .15-2 

 ,18 53-9 

 ,18 ,14-9 

 ,19 0-7 



horizoxtal 

 Intensity. 



59 

 .19 



58 



•18132 

 •1814(» 

 • 1809(5 

 •18174 

 •18-23-J 

 •18-2-23 

 ■18-2(i(> 

 ■18-289 

 •18282 

 •18239 

 •18109 

 •18188 

 •18147 

 •18134 

 •18-2;?(> 

 •I81(il 

 •18182 

 •18^J37 

 •18177 



