548 



MR A. J. HERBERTSON ON 



Ben Nevis Observatory. 



Difference between the Mass of Water Vapour per cubic metre as determined by Gravimetric Methods, 



t - t' p 

 ~2~ "755" 



and as calculated from the formula m = m' 



No. of 



C = 



O = 





No. of 



C = 



= 





No. of 



C = 



O = 





Experi- 



Calculated 



Observed 



C-O. 



Experi- 



Calculated 



Observed 



C-O. 



Experi- 



Calculated 



Observed 



C-O. 



ments. 



Value. 



Value. 





ments. 



Value. 



Value. 





ments. 



Value. 



Value. 





133 



7-42 



7-48 



- 0-06 



165 



5-98 



6 30 



- 032 



195 



1-36 



133 



+ 0-03 



134 



7-64 



7-81 



- 0-17 



166 



6-08 







196 



2-92 



2-92 



±0-00 



135 



7-13 



7 37 



- 0-24 



167 



4-70 



542 



- 0-42 



197 



6-42 



6-32 



+ 0-10 



136 



7-38 



7-74 



- 0-36 



168 



4-37 



4-46 



- 0-09 



198 



6-34 



5-97 



+ 0-37 



137 



7-46 



6-06 



+ 1-40 



169 



5-04 



3-96 



+ 1-08 



199 



5-78 



5-87 



- 0-09 



138 



7-17 



7-29 



- 0-12 



170 



4-43 



4-13 



+ 0-30 



200 



5-99 



5-94 



+ 0-05 



139 



4-01 



4-13 



- 042 



171 



4-41 



4-26 



+ 0-15 



201 



6-47 



6-37 



+ 0-10 



142 



6-77 



7-04 



- 0-27 



172 



4-47 



4-62 



- 0-15 



202 



225 



2-01 



+ 0-24 



143 



6-96 



6-71 



+ 0-25 



173 



4-61 



4-78 



- 0-17 



203 



2-13 



2-02 



+ 0-11 



144 



662 



7-02 



- 040 



174 



4-85 



4-96 



-0-11 



204 



6-86 



6-78 



+ 0-08 



145 



7-43 



6-91 



+ 0-52 



175 



5-09 



5-32 



-0-23 



205 



7-48 



7-37 



+ 0-11 



146 



7-20 



7-65 



- 045 



176 



5-68 



5-76 



- 0-08 



206 



7-45 



7-38 



+ 0-07 



147 



7-60 



7-91 



- 0-31 



177 



5-50 



5-73 



- 0-23 



207* 



1-72 



1-08 



+ 064 



148 



7-64 



7-87 



- 0-23 



178 



5-82 



601 



- 0-19 



208 



1-63 



1-53 



+ o-io 



149 



7-66 



7-90 



-0-24 



179 



5-89 



5-86 



+ 0-03 



209 



2-20 



1-98 



-f- 0-22 



150 



333 



3-42 



- 009 



180 



5-76 



5-65 



+ 011 



210* 



2-24 



1-62 



+ 0-62 



151 



3-99 



4-01 



- 0-02 



181 



5-76 



5-78 



-0-02 



211* 



336 



2-53 



+ 0-83 



152 



3-74 



3-83 



- 0-09 



182 



542 



5-13 



-o-oi 



212 



6-00 



5-87 



+ 0-13 



153 



512 



4-42 



+ 0-70 



183 



4-86 



4-92 



-0-06 



213 



4-58 



4-39 



+ 0-19 



154 



2-87 



2-89 



- 0-02 



184 



5-79 



5-91 



- 0-12 



214 



4-73 



4-44 



+ 0-29 



155 



2-26 



2-38 



-012 



185 



1-69 



1-44 



+ 0-25 



215 



5-44 



5-29 



+ 0-15 



156 



313 



3-20 



- 0-07 



186 



0-66 



0-48 



+ 048 



216 



5-58 



536 



+ 0-22 



157 



4-87 



4-94 



- 07 



187 



0-40 



0-40 



±000 



217 



5-56 



5-14 



+ 0-42 



158 



6-23 



605 



+ 0-18 



188 



0-42 



0-23 



+ 0-19 



218 



5-74 



5-34 



+ 0-40 



159 



655 



661 



- 0-06 



189 



0-38 



0-36 



+ 0-02 



219 



5-47 



5-08 



+ 0-39 



160 



6-19 



581 



+ 0-38 



190 



0-68 



0-47 



+ 0-21 



220 



5-49 



5-06 



+ 0-43 



161 



0-61 



6-22 



+ 0-39 



191 



0-43 



0-26 



+ 0-17 



221 



5-53 



5-35 



+ 048 



162 



4-48 



4-21 



+ 0-27 



192 



0-50 



0-35 



+ 0-15 



222 



5-51 



5-05 



+ 0-46 



163 



5-58 



5-72 



-044 



193 



2-08 



1-65 



+ 0-43 



223 



5-54 



5-32 



+ 0-22 



104 



5-87 



5-97 



- o-io 



194 



1-25 



1-56 



- 0-31 











The results may be summarized as follows 





Calculated value in 

 excess. 



Calculated value in 

 defect. 



No 

 difference. 





No. of 

 times. 



Average 

 excess. 



No. of 

 times. 



Average 

 defect. 



Experiments 133-183 recorded above . 

 Experiments 184-223. 



13 

 35 



0-45 

 0-25 



35 

 3 



016 



0-17 







2 



Total. 



48 



0-30 



38 



0-16 



2 



These are all very doubtful values of O, as the gain in the second tube was such as to show that the first tube was not acting properly. 



