448 
MR. DANIELL ON A NEW REGISTER-PYROMETER 
Table XIV. 
Showing the progressive expansion of the following alloys to their melting 
points. 
From 62 ° 
to 212 ° 
to 662 ° 
to Melting Point. 
Brass. Common 
O / 
0 54 
O / 
4 42 
O / 
(8 41 not correct) 
Brass. Copper 4 , Zinc 4 
1 9 
4 51 
13 39 
Brass. Copper 4, Zinc 4 
1 27 
5 3 
15 34 
Bronze. Copper 44 , Tin T v 
0 52 
3 37 
9 49 
Bronze. Copper 4, Tin 4 
0 54 
4 11 
10 16 
Bronze. Copper 4 , Tin 4 
0 58 
4 44 
10 55 
Bronze. Copper 4, Tin 4 
1 0 
4 7 
4 7 ? 
Pewter. Lead 4, Tin 4 
Type Metal. Lead and Antimony .... 
1 5 
1 5 
2 28 
3 13 
The first remark which I shall make upon these tables regards the fusing 
points of the pure metals. Having ascertained for each the expansion due to 
certain definite increments of temperature, and the utmost expansion which 
they undergo to their fusing points, it is clear that, had their expansion been 
equal for equal increments, we might have determined the true temperature 
of their melting points from these data. As it is, even, knowing something of 
the limits of error introduced into such a calculation by the increased rate of 
expansion at the upper part of the scale, and the direction in which it ought 
to affect the result, we may draw some important inferences with regard to the 
correctness of the determinations derived from other means. The following 
Table exhibits the results of such a calculation, compared with the melting 
points previously determined. 
Table XV. 
Fusing points of metals derived from their expansions to 212° and 662° sup- 
posed equable. 
From 212 ° rate. 
From 662 ° rate. 
Real Temperature. 
Tin 
O 
471 
O 
O 
442 by Thermometer. 
Lead 
670 
612 by Thermometer. 
Zinc 
848 
960 ? 
773 by Pyrometer. 
Silver 
2159 
2049 
1873 by Pyrometer. 
Copper 
3262 
2366 
1996 by Pyrometer. 
Cast Iron 
3096 
2489 
2786 by Pyrometer. 
