Corrective Cooling of Wires. 



Table III. 



Natural Convection from Long Cylinders in Air. 



(Logarithmic values of 6d?/v 2 and H/£ are given.) 



33i 



Source, j 



■ i 



Diam. 

 cm. 



Temperature Excess (° C). 



30°. 100°. 



200°. 



600°. 



1600°. 



ed 3 



k ' 



i 



Gd 3 



V*' 



H 

 k' 



0d 3 



H 

 &' 



ed 3 



V 1 ' 



H 



ed 3 



V 2 



H 



k ' 



1 



B 



0-0031 5-55 14 



5-90 



3-21 



5-98 



032 







A 



0-00404; ... ; 









4-32 



0-25 



4-22 



0-20 



5-74 



0-24 



B 



0-0051 j i-20 



0-22 



4-55 



Q-31 463 



0-31 



... 









A 



0-00691 ... 





... | ... 



3-02 



0-29 



4-92 



026 



4-44 



0-29 



B 



0-0074 



4-69 



1-99 



304 



024 



3-11 



0-25 











D 



0-0114 







3-59 



0-29 



367 



0-29 











A 



0-01262 







... 





3-80 



0-32 



370 



030 



3-23 



0-29 



B 



0*0152 



3-62 



0-30 



3-97 



0-34 



2-05 



036 





... 



... 





A 



0-02508 j ... 









270 



0-44 



2-60 



041 



212 



0-34 



B 



0-0356 



... 





1-08 



0-53 



116 



0-53 





... 







A 



0-051 



... 









1-62 



0-55 



1-52 



0-52 



1-05 



049 



D 



0-0691 







1-94 



0v8 



0-02 



0-58 











E 



0-1106 





048 



0-63 















C 



0-51 



! 



2-55 



1-11 



262 



1-17 



... 









C 



5-08 





5-55 



1-88 



5-62 



1-93 





... 



■-- 



C 



30-48 







7-88 



261 



795 



2 67 





1 





D* 



! 0-0114 







300 



0-26 



307 



0-23 











D** ... 



; 0-0114 







2-20 



0-35 



2-27 



035 











D* 



0-0691 







1-35 



050 



1-42 



0-51 



j ... 







... 



JD** .. 



00691 







0-55 



0-67 



0-62 



0-67 



! 









* Air at ^ atmosphere pressure. ** Air at 2' atmospheres pressure. 



air with fine platinum wires at temperature excesses from 

 200° C. to 1600° C. He carefully corrected for radiation. 

 His results may be represented to a certain degree of approxi- 

 mation by the formula H oc d l < 5 6 1/4: , which does not agree with 

 (3), where k and v are regarded as constant; the disagree- 

 ment is brought out even more clearly if 0d 3 is plotted 

 against H. 



