1813.] Astronomical and Magnetlcal Observations. 459 







Morning Observ. 





Noon Observ. 





Evening Observ. 



Month. 





































Hour, 



Variation. 



Hour. 



Variati 



on. 



Hour. 



Variation. 



May 



1 



/ 



/ 



o 





// 



Ih 25' 



24° 23' 



39" 



6h 30' 



240 08' 



50" 



Ditto 



2 



8 



05 



24 



08 



21 





25 



24 



22 



94 



6 



07 



24 



12 



11 



Ditto 



3 



8 



50 



24 



09 



45 



2 



35 



24 



2-1 



9fl 



6 



35 



24 



12 



05 



Ditto 



4 



y 



12 



24 



12 



25 



1 



35 



24 



16 





6 



00 



24 



12 



16 



Ditt. 



5 



8 



50 



24 



10 



32 





20 



24 



21 



Of 



7 



35 



24 



13 



45 



Ditto 



0 























6 



45 



24 



13 



38 



Ditto 



7 



9 



12 '24 



13 



42 



1 



47 



24 



17 















Ditto 



8 



9 



05 



24 



li 



15 



1 



27 



24 



19 





6 



45 



24 



11 



42 



Ditto 



9 



8 



40 



24 



11 



47 





28 



24 



19 



43 



7 



40 124 



14 



00 



Diito 



10 



8 



10 



24 



11 



39 













6 



10 



24 



14 



42 



Ditto 



11 



8 



30 



24 



14 



27 





35 



24 



21 



34 



5 



07 



24 



13 



52 



Ditto 



12 



8 



55 



24 



11 



01 



1 



20 



24 



19 



40 



5 



07 



24 



13 



51 



Ditto 



15 















15 



24 



22 



07 



6 



20 



24 



12 



50 



Ditto 



16 



7 



ao 



24 



09 



82 





50 





21 



05 













Ditto 



17 



8 



12 



24 



10 



32 



1 



30 



24 



20 



12 



6 



22 



24 



14 



02 



It is remarkable that on the 3d of May the maximum of the 

 variation was not until 35 minutes past 2; at that time there 

 was a great deal of thunder in the west : but on the next day. 

 May the 4th, in the afternoon, and wher a thunder storm was 

 in the east, the variation was only 24° 16' S0^% the dilference 

 being 9' 30'^ 



Errata in the last ohservations of N°. V. p. 371. 



March 31, for 24° 11' 42" read 24° 21' 42" 

 April 9, for llh 35' read 12^ 35' 

 Ditto 11, /or 11 25 read 12 25 

 Ditto 12, /yr 11 30 rea^^ 12 30 

 Ditto 13, /or 11 45 read 12 45 



Article IX. 

 Analyses of Books. 



I. Memoirs of the Literary and Philosophical Society of 

 Manchester, Second series. Vol. II. 181 3, pp. 484. 



This volume contains the following papers : — ■ 



1 . An Account of some Experiments to ascertain whether the 

 Force of Steam be in proportion to the generating Heat. By John 

 Sharpe, Esq.] It is well known that the elasticity of steam 

 increases at a great rate with the temperature. At 212° its 

 lelasticity is 150 times greater than at 32°, and at 252® ite elastic 



