OF CRYSTALS AND OTHER BAD CONDUCTORS. 
503 
Gutta Percha Sheet, '0617 cm. thick. Air, 14° 4 C. 
This sheet was made of the material used for insulating wire. A small quantity 
was cut from a wire, melted, and pressed into a sheet between the two cold microscope 
slides. 
Cool bar. 
Hot bar. 
wj 5-97 Aj 619 
Wg-2-35 Qi 1087 
, 1087 x -0617 x 10006 _ „ 
t-j 20-94 Ao 20-76 
v 2 28 40 Q 3 1076 
j W6 x -0617 x 10006 
A “ 2076 - 619 x 1002 ~ 000401 
12 _ 20'76 X 1-002 - 6-19 ~ 0004aG 
h mean = '000458. 
Paper Disc, 1'93 cm. diam., '019 cm. thick. Air, 15°*4 C. 
This was cut from an ordinary visiting card. 
Cool bar. 
Hot bar. 
v t 9-42 A x 9-73 
v 2 4-56 Q 1 -1515 
, 'ISIS x -010 x 10001 
v 1 19-05 A, 18-81 
v 2 27-91 Qo -1496 
, 1496 x -019 x 10001 
A - 18-81 - 9-73 x 1-0003 “ U00ui, 
A “ 18-81 x 10003 - 9-73 ~ UOO " 1,J 
Ic mean = '000315. 
“Asbestos Paper” Disc, 1*93 cm. diam., *047 cm. thick. Air, 14 0, 9 C. 
This was the ordinary asbestos millboard of commerce. It consists of paper to the 
pulp of which sufficient asbestos has been added to render it incombustible. 
Cool bar. 
Hot bar. 
v 1 8-40 Aj, 8-68 
v 2 4-02 Q x -1358 
/• — '13o8 x -047 x 10004 _ .nnnpog 
v x 20-16 An 19-93 
Vo 28-67 Q 3 -1368 
"1368 x -047 x 10004 
11 19-93 - 8-68 x 1-001 
2 “ 19-93 x 1-001 - 8-68 “ u J ' 
h mean = '000570. 
