“ EIGHTH SERIES, oy 
With an ingot of pure gold, weighing 14 lbs. 84 oz. avoirdupois,* 
. and other circumstances as in preceding series, the following re- 
> Its were given. 
a = Ace. 42 
Si o2| SE |lsalse- 
£ EB E 85 $$|¢ 3 4 
3) Sl.olo ot @o| Hore. F 
Bal eS 1B ly S | oe Bl wo ae } ; “ 
a ea 5>| O%| Sn | Heat of metal. Obs 
ll Et = sles} o Sl no j bie 
Se | She| ae) 83 | to 
$ — | at Gel ome as 4 
| Os | Ble o5/ §s 
|EC|ee |E lo 
: ~| (The water had r = 
1)/232.25)100)2 oz.|.0086'116.125!Red in .| 2 sed a short time, and 
lost a few deg’s be afo e this exp 
232.25/120|5 450} Com Plunged by ‘eee 
3/232. 251125 et is 0258 38.708 Comparable. Do. : 
tion formerly detailed, in regard to avoid Binns of tone al 
the water between two successive experiments, and also demands 
peculiar accuracy and dispatch in the process of weighing. After 
all the efforts, which were made to insure a correct result, it may 
have ee nat a few degrees of heat, in the gold, were exper” 
ded in raising temperature, and a corresponding deficiency in the 
quantity of bes of elasticity may have been the consequence. , 
The following summary exhibits a comparative view of the several 
to trial, as shown in the preceding | series, indicating 
: _of those experiments in each series which wer? 
made at the comparable temperature. 
From all the preceding series it appears that at coiiael er 
perature, each pound of steam requires. for its production of 
Cast i iron, n = e 82 poe s 
~? Wrought i ron, *- "<= - 9 
Wrought as Stage - - 103755 ” 
Cast Brass, | ito Wi ige ee 
Standard silver, eckie je 
. Pure gold, =. - - wo A DPefget ct® 
* The above en mass of gold, at the mint valuation of ah Jeers vi 
was worth $4105.448. For the use of this, as well as of several ingots of an indebted 
Res conveniences in art -experiments on ee e precious me etals, pa aa 
politene, . e, wley scrum? op Eckfeldt, chief © 
other officers of ise United States ame a 
# 
me * 
Fe ay" ; 
2 Se A a ae 
