( 540 ) 



C'oliinin ]a foiitiiiiis tlic Noliinics IVoiii llic iiiaik on the iiari'ow 

 capillary lo llio (livisioii Q at 20° C, as i-esiilliiiu IVoiii tlio calihi-atiou 

 A, V/i as resulting from the calihi-alion B. Tho last colnnm shows 

 the percentage ditiei-ences. Tlie mean j>ercenlage diiTerence between 

 Va i^nd Vn in the complete tahk* amounts to 0.19 "/o, ff>i" f'i<^ l><^rt 

 from O to 4:1 inclusive, which only was used in the following- 

 observations: 0.17 "o- For our j)urpose this agreement is snfficient. 

 From the fact that T/j — Tj is always positive it folloAvs that the 

 accuracy miglil 1»<' improved by more determinations of .s„ and of 

 the vobime in the widened uj>{)ei' part. 1 hoj)e lo reyert again to 

 this subject in a folloAving paper. 



^ 4. To determine the capacity of the rescrxdir a^ with h^ (see 

 tig. 4 I.e.) and also the bore of the part f\, the manometertube, 

 which at the cjid t\ was pi-ovided with a cock wilh a tine point, 

 was exliaiisj(>d liy the mcn'cury ^•acuum])unlp and iIkmi tilled \\\\\i 

 mercurx in a reversed ]»(jsition until the mei-cury stood aboxc at 

 /■g (in the drawing below). A (juanlity of mcMcury was drawn 

 olf twice and weighed so that we could delernnne the bore of /\ 

 at ditferent places. The level of the mercury in the tid)e was read 

 bv means of a cathetometer. Then so jnuch mercury was drawn otf 

 that the mercury still stood in the gradiuited stem i\, and this was 

 weighed. This served to determine the capacity of rt^ -f~ ''^- '^''*-' 

 following results were obtained; the ()ortio]i /"., is divided into milli- 

 meters, the centimeterdivisions are marked from to G, being 

 nearest to d^. It appeared that the bore could not be {)ui constant; 

 1 have put : 



« = ^ ^ + <''^' 



and found 

 so (hat 



a = U.UU58 , ,\ = U.85G-i (cm'). 



l\U:=: U.35G4 1 -f 0.0029 Q Q. 



Table Vlll (p. 541) contains the volumes from the di\ ision to 

 the division Q at 20' C. 



For the ealcuhxtion of the \olumes of the menisci 1 ha\e used 

 Sc'Hai-KWI.ik's table occurring in Comm. N". (57 '). For the volume 

 between the diyision on /'., and the division on r., 1 found at 

 2(r C. : 25.021 cc. 



In the calibration of an e.\|»eriniental tui»e it will iji general be 



1) These Proc. ill Jan. -21, I'Mi, p. 488. 



