on the Distribution of the Magnetic Intensity. 



17 



REDUCTION OF OBSERVATIONS MADE AT CANAAN COTTAGE. 



CYLINDER, No. I. 



OF THE REDUCTION OF THE FLAT NEEDLE TO CYLINDER No. I. 



1. From the Observations of Canaan Cottage. 



1829. H . M . s . 



July 9. At 10 47 A. M. Reduced Time of 300 vibrations Flat Needle = 1034446 Log = 3-0147079 

 1115A.M. Reduced Time of 300 vibrations, No. I. = 809-89 Log = 2-9084260 



Log reduction of Flat Needle to Cylinder, No. I. 



2. From the Observations in Captain HALL'S Garden. 



_ 0-1062819 



July 8. At 9 31 A. M. Reduced Time of 300 vibrations Flat Needle = 1013-08 Log = 3'0056437 

 858A.M. Reduced Time of 300 vibrations, No. I. = 798-73 Log = 2-9024000 



1829. 



Log reduction of Flat Needle to No. I. 



3. From tJie Observations at Maker stoun. 



- 0-1032437 



June 29. At 10 51 A. M. Reduced Time of 300 vibrations Flat Needle = 1025-23 Log = 3-0108214 

 959A.M. Reduced Time of 300 vibrations, No. I. = 804-86 Log = 2-9057203 



Log reduction of Flat Needle to No. I. 

 4. Makerstoun. 



= 0-1051011 



June 29. At 8 17 p. M. Reduced Time of 300 vibrations Flat Needle = 1024-22 Log = 3-0103933 

 ... 28. At 7 16P.M. Reduced Time of 300 vibrations, No- I. = 803-24 Log = 2-9048453 



Log. reduction of Flat Needle to No. I. 



= 0-1055480 



As the above comparisons present considerable discordance, it will be better to defer the final re- 

 duction of the Flat Needle to that of HANSTEEN'S Standard, until the result of the whole of the compa- 

 risons with No. I. have been collected. 



VOL. XII. PART I. C 



