638 
Proceedings of the Eoyal Society 
in part to heat reflected by the polished surface of the wires. 
These tables show very little difference in the protecting powers of 
the two wire-cloths. The tables must not, however, he compared 
too closely, as the conditions do not admit of very exact results. 
It may he noticed, for instance, that while the two tables agree 
Iron Wire- Cloth. 
No. 35 wire and 36 meshes to the inch. 
1. 
2. 
3. 
4. 
Air. 
Case. 
Difference. 
Protection. 
15°*7 
34°-4 
18°*7 
None. 
15° -4 
25° -7 
10° -3 
1 Thickness. 
15° -3 
22° -5 
7°-2 
2 
1 3° ’6 
16° -3 
2° -7 
4 
03 
0 
14° *0 
0°-6 
8 
15°-0 
15° -05 
0°-05 
12 ,, 
15° -2 
15 0< 2 
o 
o 
o 
O 
16 
1 
Brass Wire-Cloth. 
No. 38 wire and 70 meshes to the inch. 
1. 
Air. 
2. 
Case. 
3. 
Difference. 
4. 
Protection. 
15°*6 
34°-5 
05 
o 
00 
None. 
16° 
26° -6 
10°*6 
1 Thickness. 
16° '4 
22° -8 
6°-4 
2 
16°*3 
OO 
o 
OC 
2° -5 
4 
16°‘4 
16°*8 
1 o 
° 
8 
16°T 
16°T5 
O 
° 
© 
12 
16° -2 
16° -2 
o 
o 
O 
O 
16 
fairly well at the two ends, they do not agree at intermediate points. 
This disagreement at the intermediate points will probably he the 
result of the more or less perfect overlapping of the meshes, and of 
the greater or less degree of contact between the folds of the cloth. 
Neither of these have any existence when only one thickness is 
used; they are averaged when there are many thicknesses, and 
