248 
MR. J. E. PETAVEL ON THE HEAT DISSIPATED BY A 
Table II. — Emissivity in Air. 
0 ■ 113 atmo.sphere 
0 - 969 atmosphere 
7 - 08 atmospheres 
20-92 atmospheres 
at 16“ C. 
at 16' C. 
at 16° C. 
at 16° C. 
Tempera- 
Tempera- 
Tempera- 
Tempera- 
ture S in 
Emissivity 
ture ^ in 
Emissivity 
ture 3 in 
Emissivity 
ture 3 in 
Emissivity 
decrees 
in C.G.S. 
degrees 
in C.G.S. 
degrees 
in C.G.S. 
degrees 
in C.G.S. 
Centi- 
units. 
Centi- 
units. 
Centi- 
units. 
Centi- 
units. 
grade. 
grade. 
grade. 
grade. 
118-5 
0-0005545 
82-1 
0-0007505 
98-2 
0-001522 
1 65-9 
0-002205 
296-7 
0-0007021 
199-0 
0-0009533 
.308-0 
0-002084 
204-3 
0-002886 
466-8 
0-0008680 
355 - 4 
0-001139 
656-5 
0-002801 
422-8 
0-003529 
771-9 
0-001325 
635-8 
0-001518 
802 - 5 
0-003385 
735-2 
0-004468 
962-6 
0-001784 
865 - 9 
0-001957 
945 - 0 
0-003605 
899-6 
0-004975 
966-0 
0-002213 
1060-2 
0-005673 
39 - 3 atmospheres 
65-4 atmospheres 
at 16° C. 
124-7 atmospheres 
168-4 atmospheres 
at 16° C. 
at 16° C. 
at 16° C. 
Tempera- 
Tempera- 
Tempera- 
Tempera- 
ture in 
Emissivity 
ture .9^ in 
Emissivity 
ture S in 
Emissivity 
ture S in 
Emissivity 
degrees 
in C.G.S. 
degrees 
in C.G.S. 
degrees 
in C.G.S. 
degrees 
in C.G.S. 
Centi- 
units. 
Centi- 
units. 
Centi- 
luiits. 
Centi- 
units. 
grade. 
grade. 
grade. 
grade. 
165-1 
0-003724 
114-3 
0-004792 
88-1 
0-005869 
82-5 
0-007198 ' 
' 378-1 
0-004544 
283-2 
0-005433 
199-3 
0-006785 
150-0 
0-007909 
571 -5 
0-005191 
463-5 
0-006086 
303-2 
0-007453 
258-3 
0-008573 
771-0 
0-005856 
621-7 
0-006635 
503-7 
0-008386 
418-8 
0-009496 
902-5 
0-006363 
872-6 
0-007670 
689-1 
0-009113 
567-1 
0-01012 
1006-7 
0-006809 
1055-3 
0-008485 
926-9 
0-01022 
787-5 
0-01116 
915-5 
0-01175 
1031-1 
i 
0-01242 j 
Table III.- — Emissivity in Oxygen. 
0-086 atmosphere at 16° C. 
DOl atmospheres at 16° C. 
1 
10-0 atmospheres at 16° C. 
Temperature .9 
in degrees 
Centigrade. 
Emissivity in 
C.G.S. units. 
Temperature 3 
in degrees 
Centio-rade. 
Emissivity in 
C.G.S. units. 
Temperature 3 
in degrees 
Centigrade, i 
Emissivity in 
C.G.S. units. 
86-5 
0-000513 
' 222-7 
0-001080 
256-4 
0-002349 
288-1 
0-000683 
' 571-7 
0-001515 
483-0 
0-002946 
381-1 
0-000793 
921-9 
0-002231 
733-3 
0-003557 
585-0 
0-001066 
976-9 1 
0-004280 
736-3 
0-001352 
1 i 
922-6 
0-001869 
i 
j 
• 1 
i 
1 
