ISSO.] 



J. F. Tennant— O// Standard Wei(jh.ts. 



49 



the ])il]ar carrying the central plane, and the suspensions of the scale pans. 

 The Humidity has been deduced from a new Masons Hygrometer : I have 

 not the errors of its Thermometers, but they are modern, and not likely to 

 have any producing sensible corrections to my result. 



The following is a specimen of computation for the comparison of EI 

 and Oj which is entered in the type form ; in it, v EI = volume of water 

 at its greatest density which is displaced by EI at 32°. F. 



. , ^ tvt. EI 479-95979 „ ^ , 



It therefore = = = [1-35051] 



.... ^ 479-997G0 „,o.m 

 similarly v 0, = -7-^77^^ = [1-74842] 



May 24th, 1879 a. m. 

 Commenced at 6h. 48 m. Ended at 7h. 33 m. 



Dry Bulb 85° 9 F. Dry Bulb 85 4 



Wet do. 810),. rv ■ Wet do. 80-1 ■) ™ . 



f Vapour Tension / Vapour Tension 



Diff. 493 5-3) 



960 in. 



o in- 

 Mean of Thermometers 85-5 Mean Eed. Barotneter 29-605 

 Correction OOO 0189(0-993 + 0960) =0-369 



Mean Temperature 85 50 h. = 29 236 log — 146592 



log At (Tab I.) 5-59005 



7-05597 705597 



log y EI 1-35051 log y Oj ... 1-74842 



(Tab. III.) log (1 + E Ft) 0-00035 (Tab. III.) log (1 + E Bt) . . . 00066 



AirdisplaccdbyEI ) j ^ g.^^^gg Air ^ispW by O, ) ^ 



= ()'02,ji>li grs. ) ° = O ODobol grs. j ° 



grains. 



Weight EI in Vacuo = 479 95979 of P S. 

 Air displaced = — 0-025517 



EI = 479-934273 



Airdisplacedby Oi= + 0-063834 

 Oi = EI — 0-000475-* 



Oi = 479-907632 



* In sccliun IV, I found EI = Oj + 0-il7d V.„i and (Sec. YI) T.^ = 0-009917 gniins. 



7 



