266 



Abstracts of the Makerstoun Observations, 1843. 



4h 20™ P.M. Makerstoian mean time. 

 9'» 10™ P.M 



The smaller the second is the more nearly will the approximate curve resemble the true curve in form, and 

 the smaller the first the more nearly will the approximate curve approach the true curve in position. 



In the foregoing Table, the range of the errors, and their mean for the 12 months (independent of sign), 

 are given for each couple of hours. The hours which seem best to satisfy tlie two conditions are — 



\st, ISi" and 5'^ Gottingen, or 5*^ 10™ a.m. and 



2d, 22"^ and 10'' or Q'' 10™ a.m. and 



3d, 18'' and O'' or 5'' 10™ a.m. and 11^ 10™ a.m 



4«A, IQi^and &" or 6'' 10™ a.m. and 5"' 10™ p.m 



5*A, 23'' and lO'' or lO*" 10™ a.m. and 9'' 10™ p.m 



GiA, 22''and G*" or 9'' 10™ a.m. and S*" 10™ p.m 



The first couple of hours is considerably superior to any of the others, the mean of the errors being only 

 0°-24, and their range only 0°-68, while the error for the year is only — 0°'17. The second couple of hours is 

 more convenient. For ordinary purposes, the maximum and minimum register thermometers seem sufficiently 

 accurate.* 



TABLE V. — Diurnal Ranges of Temperature for each Civil Day in 1843, as deduced from the 

 Observations of the Maximum and Minimum Register Thermometers. 



Civil 

 Day. 



January. 



February. 



March. 



April. 



Jlay. 



June. 



July. 



August. 



September. 



October. 



November. 



December. 





o 



o 







o 



o 















o 











c 



1 



9-2 



7-3 



10.9 



13-7 



28-5 



5-7 



16-9 



12-0 



17-6 



11-4 



17-7 



8-4 



2 



44 



M 



8 



•2 



13-6 



19-0 



19-5 



17-0 



13-9 



16-8 



110 



15-9 



22-8 



3 



24-1 



4-3 



8 



•4 



11-9 



200 



3-5 



9-6 



17-0 



12-4 



19-8 



18-0 



12-0 



4 



4-9 



17-3 



21 







13-1 



23-2 



6-9 



20-9 



200 



13-9 



16-0 



20-4 



5-9 



5 



30 



3-2 



15 



4 



91 



14-4 



1-2 



15-0 



19-9 



31-8 



12-7 



16-2 



2-0 



6 



17-5 



7-9 



15 



6 



20-8 



16-6 



11-0 



13-3 



18-7 



23-9 



8-5 



16-6 



7-9 



7 



7-3 



6-8 



12 



5 



130 



17-4 



13-5 



22-4 



21-0 



29-5 



13-0 



7-8 



11-3 



8 



3-9 



2-9 



22 



9 



12-8 



9-6 



9-9 



18-5 



13-9 



36-5 



5-8 



7-2 



4-9 



9 



18-6 





19 



3 



9-6 



9-5 



7-9 



121 



17-4 



29-3 



18-0 



11-2 



8-0 



10 



5-3 



6-5 



12 



1 



13-7 



9-5 



12-5 



15-3 



21-3 



24-6 



8-6 



8-9 



11-5 



11 



50 



6-2 



22 



5 



17-1 



24-9 



12-9 



12-7 



23-7 



15-6 



8-0 



111 



7-8 



12 



110 



4-7 



9 



9 



22-5 



22-6 



4-0 



21-7 



23-8 



15-7 



6-5 



101 



8-8 



13 



17-4 



8-0 



8 



7 



10-8 



9-0 



8-6 



13-7 



27-9 



21-0 



17-0 



8-7 



2-7 



14 



20 



2-6 



18 



6 



24-0 



16-4 



17-1 



23-3 



27-5 



28-3 



13-8 



14-6 



3-8 



15 





9-7 



23 



1 



9-8 



6-5 



18-3 



17-1 



14-2 



15-3 



18-6 



13-9 



50 



16 





14-2 



11 



2 



13-6 



1-8 



250 



16-3 



15-5 



28-9 



24-9 



11-4 



100 



17 



15-9 



13-9 



6 



9 



21-0 



6-8 



19-9 



19-9 



22-2 



20-5 



8-5 



14-5 



14-5 



18 



6-9 



29-5 



19 



9 



18-8 



11-2 



13-1 



11-6 



27-2 



20-5 



16-1 



9-5 



10-0 



19 



5-9 



19-6 



12 



8 



17-7 



21-0 



7-1 



13-5 



26-6 



30-9 



23-5 



15-5 



4-8 



20 



2-4 



6-3 



10 



9 



21-7 



15-8 



24-8 



11-0 



12-9 



21-3 



15-6 



9-2 



7-6 



21 



16-7 



5-9 



18 



4 



15-6 



4-5 



16-8 



13-1 



22-4 



9-2 



90 



160 



7-7 



22 



20-7 



4-1 



16 



2 



6-5 



3-6 



20-4 



24-1 



9-9 



30-8 



191 



6-9 



17-7 



23 



8-0 



2-7 



10 







8-5 



4-2 



27-4 



110 



22-1 



33-0 



9-6 



10-3 



5-7 



24 



4-3 



4-1 



8 



9 



25-9 



50 



21-6 



20-6 



33-4 



11-2 



5-6 



10-3 



4-8 



25 



4-1 



30 



4 



9 



11-9 



8-1 



8-9 



31-2 



19-7 



6-0 



16-9 



9-1 



6-5 



26 



4-2 



6-6 



11 







14-4 



19-2 



119 



14-3 



2M 



11-5 



18-0 



26-1 



5-3 



27 



12-2 



6-7 



3 



7 



24-7 



10-3 



14-4 



15-8 



21-3 



11-8 



22-1 



3-8 



9<o 



28 



1-5 



6-6 



9 



3 



6-5 



6-3 



11-3 



17-5 



20-7 



14-1 



12-5 



61 



10-5 



29 



12-2 





26 







20-6 



18-3 



17-5 



15-0 



14-6 



23-6 



4-5 



3-4 



3-0 



30 



1-2 





27 



6 



13-8 



22-4 



16-8 



16-8 



30-7 



18-0 



11-4 



21-4 



31 



31 



10-5 





11-5 





61 





17-5 



23-3 





15-9 





6-1 



Mean 



90 



7-8 



14-1 



15-2 



13-3 



13-6 



16-7 



20-2 



20-8 



13-6 



12-4 



8-1 



* There are three couples of homonymous hours given in the Table, but only one couple gives satisfactory results. It will be 

 found that twelve or thirteen combinations of hours, having the common interval of eleven hours (nearly the critical interval), will 

 give a mean error for the y^ar from a third to a half less than that from the twelve combinations of homonymous hours, the combina- 

 tions commencing with 10'' P.M. and Qi" a.m., 11'' p.m. and 10'' a.m., and so on to the twelfth or thirteenth couple. 



