32 



THE DIFFUSION OF GASES THROUGH 



Table 7. — Diffusion of hydrogen through water into air. Heavy swimmer, M= 37.42; 

 i? A = 4i.45Xio 8 ; p OT =i3.6; 1 /p g = 0.3486;* A = Mgp m /R h = o.o\2oy, A'=i.8 cm.; 

 /i"= 1 1.5 cm.; A'" = 4. 5 cm.; / = 20.5 cm. Areas, inside 1 1.5 cm. 2 , outside 13.5 cm. 2 , 

 ring 24.6— 13.5 = 1 1.1 cm. 2 ; 0/1 = 89. 55X io~°. Diameters 3.83, 4.1 5, 5.6 cm.; cor- 

 rection 0.13 cm. Hg. 



Date. 



Hour. 



Barom- 

 eter. 



// 



/ 



OTXIO 6 



Date. 



Hour. 



Barom- 

 eter. 



H 



t 



wxio 6 





h. 



w. 













1 



h. 



m. 













Apr. 14 



5 



00 



76.26 



74.00 



17-4 



2007 



May 10 



4 



00 



75 -32 



43-7' 



21 .2 



1171 



15 



3 



00 



75 



81 



7' 



86 19.7 



'935 



" 



4 



00 



75 



69 



43 



48 



21 .6 



1 164 



16 



3 



30 



75 



25 



68 



92! 18.8 



1861 



.2 



4 



00 



75 



90 



4< 



37 



21.5 



1161 



17 



3 



30 



75 



45 65 



96! 17.9 



I7 86 



'3 



4 



30 



75 



92 J43 



10 



22.0 



1152 



18 



4 



00 



75 



67 63 



44 18.3 



1715 



14 



4 



30 



76 



81 42 



75 20.6 



1 148 



'9 



4 



00 



75 



69 I61 



02 | 16.9 



1657 



'5 



4 



00 



76 



'4 



42 



2820.2 



"37 



20 



3 



45 



75 



10 58 



82 16.2 



1 60 1 



16 



4 



00 



75 



74 



42 



45 21.9 



"35 



21 



4 



00 



75 



50 ; 57 



21 16.8 



'554 



'7 



4 



00 



75 



93 



42 



44 21.9 



"35 



22 



4 



00 



76 



'4 155 



64 1 16.7 



1512 



18 



4 



00 



75 



32 



42 



2221.1 



1 132 



23 



4 



00 



76 



37 53 



8l l6.I 



.465 



'9 



4 



00 



75 



86 



4^ 



13 21.6 



1 128 



24 



4 



00 



76 



02 ,2 



65 17-4 



1428 



20 



4 



00 



76 



08 



42 



15,22.5 



1125 



25 



4 



00 



76 



26 51 



94 18.5 



1404 



21 



4 



30 



76 



09 



4-2 



09 21.9 



1123 



26 



3 



30 



76 



82 50 



82 18.4 



'374 



22 



4 



00 



75 



82 41 



97 22.4 



1 121 



27 



3 



15 



76 



88 



50 



09 19.7 



'349 



23 



4 



00 



76 



40 



4« 



98 23.1 



1118 



28 



3 



15 



76 



33 



48 



52 ! 20.8 



1302 



24 



4 



00 



76 



1 1 



41 



79 ; 22.6 



1115 



29 



4 



00 



75 



77 



4') 



01 21.2 



I3'3 



25 



4 



00 



75 



69 



41 



81 23.3 



1113 



30 



4 



00 



75 



58 



48 



02 19.7 



1293 



26 



4 



00 



75 



96 



41 



64 23 . 1 



1 109 



May 1 



3 



45 



75 



02 



47 



31 20.2 



1272 



27 



4 



00 



76 



22 41 



3' 22.5 



1103 



2 



4 



00 



74 



9' 



4<> 



71 20.0 



•257 



28 



4 



30 



76 



20 141 



14 22.6 



1098 



3 



4 



00 



75 



7' 



4- 



78 1 19.0 



1235 



29 



4 



00 



7 2 



95 I40 



82 2 1 . 5 



1093 



4 



4 



•5 



76 



•4 144 



96 19 



1213 



30 



4 



00 



70 



22 [40 



73 21.1 



1092 



5 



4 



00 



76 



35 (44 



33! "8.2 



"99 



1 3' 



3 



30 



75 



91 40 



66 2 1 . 6 



1088 



6 



4 



00 



76 



48 44 



03 18.8 



1189 



June 1 



4 



00 



74 



96 



40 



88 23.2 



1089 



7 



4 



30 



76 



06 43 



85 



19.0 



1.83 



2 



5 



00 



75 



55 



4" 



80 23.2 



1087 



8 



4 



00 



75 



93 |43 



83 



20.2 



1.78 



3 



3 



'5 



76 



25 



40 



56:21.9 



1085 



9 



4 



00 



74-95 J43-85J21.I 



1 



"75 















*Cf. § 24. 



24. Correction for Density of the Glass. — The provisional value of i/p a ad- 

 mitted in tables 2, 3, 4, 5, 6, and 7 when the divers were engaged, viz, 

 1 /p a = 0.3486, was inadvertently chosen too small; i. e., the density was 

 overestimated. Experiments made by Miss L. C. Brant at the end of the 

 work, when the divers were available, showed the values given in table 

 8, the divers being recognized by the weights m. 



Table 8. 



No. 



m 



Pa 



Used in table. 



A 

 B 

 C 

 D 



12.01 14 

 37.4248 

 14.4481 

 1 8 . 0962 



2 . 4840 

 2.4701 

 2.4873 

 2 . 42 1 9 



3-6 



7 



5 



2. 4 



It suffices for the present purposes of correction to take the mean value 

 p g — 2.466, so that the error is 8p g — —0.402. 



