644 



Mr. J. S. G. Thomas on the 



Table I. — Directional Anemometer D4a. 



Inclination 



of 



Wires. 



Temperature. 



Air 



Stream. 



(°C.) 



Meter. 



(°F.) 



Barometer 

 (ins.). 



Vol. of 



Aii- 

 passed 



(1/60 

 cub. ft.). 



Time j Uncorr 



of j volume j 

 Observ. per hour 

 (mins.) (cub. ft.). 



Deflexion. 



Left. ; Eight, 



Diff. 



Horizontal. 



24-0 



75-1 



2999 



1-42 



3 



0-47 



272 



227 



45 





24 



75-1 



2999 



2-08 



3 



0-69 



289 



209 



80 





24-0 



75T 



29-99 



1-84 



2 



092 



310 



190 



120 





24-0 



75-2 



29-99 



2-40 



2 



1-20 



335 



164 



171 





24-0 



751 



29-99 



3-12 



2 



1-56 



373 



128 



245 





24-0 



751 



29-99 



3-65 



2 



1-83 



401 



100 



301 





24-0 



' 75-2 



29-99 



3-98 



2 



1-99 



423 



78 



345 





24-0 



75-1 



29-99 



4-49 



2 



2-24 



446 



54 



392 





240 



75-1 



29-99 



6-38 



2 



3-19 



457 



44 



413 





24-0 



75T 



29-99 



9-32 



2 



4-66 



464 



37 



427 





24-0 



75-2 



2999 



7-74 



2 



3-87 



462 



39 



423 





24-0 



78-2 



29-99 



5-62 



1 



5-62 



459 



42 



417 





24-0 



75-2 



29-99 



18-60 



2 



930 



441 



62 



379 





24-5 



752 



29-99 



12-40 



1 



12-40 



423 



77 



346 





245 



75-2 



29-99 



15-0 



1 



] 5-0 



410 



90 



320 





25-0 



75-2 



29-99 



18-7 



1 



18-7 



396 



104 



292 





25-0 



75-2 * 



29-99 



20-7 



1 



207 



389 



110 



279 





27-0 



751 



29-99 

 29-98 



247 



1 



24-7 



376 



123 



253 



"VERTrC'AL. 



22-2 



72-2 



0-95 



5 



0-190 



271 



228 



43 





222 



72-2 



29-98 



1-73 



4 



0-432 



302 



197 



105 





22 



72-3 



29-98 



2-03 



3 



0-677 



332 



166 



166 





22-0 



722 



29-98 



2-98 



3 



0-993 



362 



138 



224 





22-0 



72-1 



29-98 



3-14 



2 



1-57 



393 



107 



286 





220 



72-1 



29-98 



4-54 



2 



227 



422 



78 



344 





22-5 



72*2 



2998 



5-84 



2 



2-92 



446 



57 



389 





22-5 



72T 



29-98 



3-80 



1 



3-80 



463 



41 



422 





22-5 



720 



29-98 



4-58 



1 



4-58 



467 



36 



431 





23-0 



720 



29-98 



6 30 



1 



630 



463 



40 



423 





230 



73-0 



29-98 



8-00 



1 



8-00 



454 



48 



406 





230 



73-0 



29-98 



12-20 



1 



12-20 



431 



72 



359 





23-0 



730 



29-98 



1390 



1 



13-90 



422 



79 



343 





23-5 



730 



29-98 



197 



1 



19-7 



400 



102 



278 





23-5 



73-0 



29-98 



24-5 



1 



24-5 



388 



114 



274 



