1252 
^IR. J. E. RETAVEL OX THE HEAT DISSIPATED BY A 
Table A"IIT.—Emissivity in Air. 
E X 10® = 403 yA®® + DG3yA-ET 
5 = 
of radiator 
aboT e the 
enclosure 
in degrees 
Centigrade. 
0-1* 
atmo- 
.'phere. 
1 -0* 
atmo¬ 
sphere. 
10 
a< mo- 
spheres. 
20 
atim- 
splieres. 
30 
atino- 
splieres. 
40 
atmo¬ 
spheres. 
50 
atmo¬ 
spheres. 
60 
atmo¬ 
spheres. 
lUO 
0 -COO.jO 
0 -0006 i 
0 -001728 
0 002463 
0-0030^0 
0 -003-534 
0 -003974 
0-004376 
21)0 
0 ■00060 
0 -00095 
0 -001992 
0 -002769 
0 -003373 
0 -003888 
0 -004345 
0 -004761 
800 
0 oooyo 
0 -00106 
0 -002256 
0 003074 
0 -003706 
0-004241 
0-004715 
0 -005146 
•400 
0 ■ooo~s 
0 -00119 
0 -002520 
0 003380 
0-004039 
0 -004593 
0 -0050S6 
0 -005531 
500 
0 -00066 
0 -00132 
0 -002785 
0 003686 
0 -004372 
0 -004949 
0 -005457 
0 -005916 
GOO 
0 -oooys 
0 -00146- 
0 -003049 
0 -003992 
0 -004705 
0 -005302 
0 -005827 
0 -006302 
700 
0 -00114 
0 -00165 
0 -003314 
0-004298 
0-005038 
0 -005656 
0 -006198 
0 -006687 
800 
0 -001 So 
0 -00162 
0 -003578 
0 004603 
0 -005.371 
0 -006010 
0-006569 
0 -007072 
900 
0 -00157 
0 -00205 
0-003842 
0 -001909 
0 -005704 
0 -006363 
0 -006939 
0-007457 
noo 
0 -00160 
0 -00282 
0 -004107 
0-005215 
0-006037 
0-006717 
0 -007310 
0-007842 
1100 
— 
— 
0-001371 
0 -005511 
0-006370 
0 -007071 
0-007681 
0 -008227 
1200 
0-004636 
0 -005827 
0 -006702 
0 007424 
0 -008051 
0-00S612 
3- = temp, 
of radiator 
above the 
enclosure 
in degrees 
Centigrade. 
80 
atmo¬ 
spheres. 
100 
atmo¬ 
spheres. 
120 
atmo¬ 
spheres. 
140 
atmo¬ 
spheres. 
160 
atmo¬ 
spheres. 
Temp, of 
i-adiator 
iu degrees 
Centigrade 
above the 
tein)-)era- 
tiire of the 
enclosure. 
Heat lost by 
couveetion = E(; 
calculated, 
taking 
Kq = 00000561, 
a = 00019, 
and 
E(; = 6-184 X K. 
Eadiatiou 
according 
to 
J. T. Bot- 
TOilLEX’s 
result.®. 
Loss of 
heat due 
to con¬ 
duction + 
radiation. 
100 
0 -0050.t8 
0 -005741 
0 006329 
0 -006874 
0 -007385 
100 
0 -000413 
0 -000034 
0 -000447 
200 
0 -005507 
0 -O06170 
0 -006775 
0 -007334 
0 -007859 
200 
0 -000479 
0 -000059 
0 -00053S 
300 
0 005916 
0 006599 
0 -007220 
0 -007795 
0 008332 
300 
0 -000545 
0 -000094 
0 -000639 
400 
0 006325 
0 -007028 
0 -007666 
0 -008255 
0 -008805 
400 
0-000611 
0 -000134 
0 -000745 
500 
0 006734 
0 007456 
0 -008111 
0-008715 
0 -009278 
500 
0 -000677 
0 -000176 
0 -000853 
600 
0 -007143 
0 "007885 
0 -008556 
0 -009175 
0 009751 
600 
0 -000742 
0 -000218 
0 -000960 
700 
0 007552 
0 -008314 
0 -009002 
0 -009635 
0 -010225 
700 
0 -000808 
0 -000259 
0 -001067 
800 
0-007961 
0-008743 
0 -009447 
0 -010095 
0 -010698 
800 
900 
0 008371 
0-009171 
0 -009893 
0 -010555 
0011170 
900 
1000 
0 008780 
0 -009600 
0 -010338 
0 -011016 
0-011643 
1000 
1100 
0 -009189 
0-0100-9 
0 -010784 
0 -011475 
0 012117 
1100 
1200 
0 -009598 
0 -010457 
0 -011229 
0 -011936 
0 -012590 
1200 
• 
* In this and the four following tables the figures in italics, referring to pressures outside the range of 
the forinnhv, are olrtained from a direct interpolation of the observed values. In every case the emissivity 
is expressed in water-gramme-degrees per square centimetre of radiating siu’face per second. 
