502 
MR. C. H. LEES ON THE THERMAL CONDUCTIVITIES 
Para Pujbber, pure. Sheet *0264 cm. thick. Air, 13 0, 8 C. 
Cool bar. 
Hot bar. 
9'00 A x 9'26 
5'01 Qj T401 
-1401 x '0264 x 1 0002 
vj 19-23 Aj 19-00 
27'87 Q 3 '1433 
_ '1433 x '0264 x 1-0002 
A- 19-00-9-26 x 1 0005 “ uuu ' JwU 
- 19-00 x 1-0005 - 9-26 _ UUUuu0 
Jc mean = '000384. 
Sulphur Plate, -0584 cm. thick. Air, 14 0, 2 C. 
This plate was made in the same way as the plate of shellac, except that it was 
found better to use a sheet of tinfoil on the surface of each slide. 
Cool bar. 
Hot bar. 
Vi 6"60 Aj 6"83 
v„ 3"08 Qj "1082 
-1082 x -0584 x 1-0007 
v l 20-92 A 3 20-74 
v 2 28-42 Q 2 -1085 
7 -1085 x -0584 x 1-0007 
^ “ 20-74 - 6-83 x 1‘002 ~ 
2 ~ 20-74 x 1-002 - 6-83 ~ UUU40y 
h mean = '000455. 
Ebonite Disc,* P93 cm. diam., -0414 cm. thick. Air, 14 0, 9 C. 
Cool bar. 
Hot bar. 
v Y 7-35 A 1 7-61 
v 2 3-36 Q l -1227 
7 -1227 x -0414 x 1-0004 
&1 ~ 20-10 - 7-61 x 1-0013, ~ 000407 
v x 20-30 Ao 20-10 
v 2 28-16 Q, -1202 
7 -1202 x -0414 x 1-0004 
- 20-10 x 1-0013 --701 “ UU0 ° 98 
k mean = '000403. 
* Kindly supplied to me by Mr. C. H. Gray, of the Silver town Company. 
