V 



1825.] Philosophical Transactions for 1825, Part L 45^ 



the magnets to acquire the temperature of the water, the ohser-? 



vations were repeated. The scale made use of 



for the temperature was in all cases that of Fahrenheit." 



From the results of the observations given in the tablegf* 

 described in the paragraph last quoted, we extract the following :' 



** T(ibles of the Magnetic Intensities corresponding to different 

 Temperatures of the Magnets, 6th June, 1823. 



Mean temper 

 ature of the 

 magnets. 



62 '050 



59-05 



77-65 



74-00 



70-65 



67*15 



63-80 



62-05 



Diff. of temp 

 in successive 

 observations. 



- 3-00 

 + 18-60 



- 3-65 



- 3-35 

 ~ 3-50 



- 3-35 



-r- 1-75 



Magnetic in- 

 tensity or va- 



F 



lues of rv. 



M 



212-5620 

 212^9423 

 210-6228 

 210-9892 

 211-4178 

 211-8353 

 212-2167 

 212-4640 



Variation of ■ 



- for 1° Fahr, i 



j\I iru ft (-!'!=■. 



0-126»[b ffiJnoxno.' 



0-1279^^^'^ .cfsq 3fi-« 

 0-ii93t *n ^^oaui-j.f- 



0-1413 ^«>i« »' 



7 th June, 1823. 



Mean temper- 

 ature of the 

 magnets. 



57 -00^ 



67-00 



70-85 



75-00 



60-50 



Diff. of temp 

 in successive 

 observations 



+ 10-00 

 + 3-85 

 + 4-15 

 -14-50 



Magnetic in. 

 tensity. 



2129803 

 211-9209 

 211-3907 



210-8848 

 212-5489 



Variation of 

 F 



M 



or A 



for 1° Fah. 

 F 



0-1059 

 0-1377 

 0-1219 

 0-1148 



13^^ June, 1823. 



Mean temper- Diff. of temp. 

 <tture of thei in su<;cessive 



magnets. 



observations 



Magnetic in- 

 tensity orva- 



F 

 lueof -— . 

 M 



Variation of 



i^ for 1° Fah. 

 M 



F 



Some anomalies observed by Mr. Barlow between the daily 

 changes in the direction of a needk when placed in the house 



