Bulletin . 1001000900800700600 1! \i N A \\ \ \ P. \A \\ \ s 11 \ \ V I / > \ // r 2. FZp- ii v V > \ It \ v \ \ X \ X \\ \ N, \ •J Jt \ \\ \ \\ itr \ i 1 — i; J? 1 \ i / !\! \ \ \ / y (\ O II \ r J it \ 1 \ >_ zn 1 1 1 1 , \ i 1 1 1 X \ i i \ 1\ \\ \ 1 * ii \ \ \ 1/ f?|° ils c n cr\ >-a Ii 1 ; 1 ) CD .. o i/ 11 1 1 j ii 1 1 1 ; ) ii i 1 |j // t i ij \1 \ 1 (1 \ i i 1| 1 1 / * ii • i I \ 11 ) o CT 0 — cr O RESISTANCE TO HEAT FLOW OP FIRE BRICK, AIR SPACE, ASBESTOS, AND COMMON BRICK. The striking feature concerning the side-wall thermocouples, set b,is the large temperature drop thr
Bulletin . 1001000900800700600 1! \i N A \\ \ \ P. \A \\ \ s 11 \ \ V I / > \ // r 2. FZp- ii v V > \ It \ v \ \ X \ X \\ \ N, \ •J Jt \ \\ \ \\ itr \ i 1 — i; J? 1 \ i / !\! \ \ \ / y (\ O II \ r J it \ 1 \ >_ zn 1 1 1 1 , \ i 1 1 1 X \ i i \ 1\ \\ \ 1 * ii \ \ \ 1/ f?|° ils c n cr\ >-a Ii 1 ; 1 ) CD .. o i/ 11 1 1 j ii 1 1 1 ; ) ii i 1 |j // t i ij \1 \ 1 (1 \ i i 1| 1 1 / * ii • i I \ 11 ) o CT 0 — cr O RESISTANCE TO HEAT FLOW OP FIRE BRICK, AIR SPACE, ASBESTOS, AND COMMON BRICK. The striking feature concerning the side-wall thermocouples, set b,is the large temperature drop through the fire-brick wall, the verysmall drop through the air space, and, again, the large temperature 12 FLOW OF HEAT THROUGH FURNACE WALLS. drop through the common brick wall. These drops plainly indicatethat the resistance to heat passage of the air space is very low com- 1000 THICKNESS OF ARCH ROOF, 6 8 10 12 14. 4 6 8 10 12 14 10 THICKNESS OF SIDE WALL, INCHES. pared with that of either brick wall, only about one-fourth asmuch. The last temperature gradient through the roof, as given by DISCUSSION OF TEMPERATURE CURVES. 13 the set of thermocouples c, shows a rather low temperature dropthrough the fire brick, a high drop through the 1-inch layer of asbestos,and a rather small drop through the common brick. These temoera- TEMPERATURES, °C. 4 S o © o 3 \ ill \ 1 \ \ S? f\j ?-\ \ \\ . —— \ «; \ V V 1 \ \ \\ \ r. i \ L\_ fi \ -• \ \ 1 \ \ TV A \ \ , \ y / j\ 1 \ 11 II •^ >ri i | \\ \ w 2 l lj \ \ >-o 1,1 \\ \ i i li \) 1 // 3, ! i y ,3 1 li /i> i ( / 5 V, i / i _J .1 V j1 fi li / i \i /i i i PO i! i i )\ Tn IS • 1 r i 1 l \ v.! .2 li j \ \ D * li i 1 : / ) i CO > Q) OC/i T3 5 § -+? ^-»- c reD 3 a> re o5L £D co ro co CD Q- n ture drops indicate that the resistance to heat flow
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