——_— 
Lal 
On the Rapid Production of Steam. 313 
The five experiments which were made at a dull red heat in day 
light, and which were therefore marked comparable, prove that, on 
an average, one pound of steam requires 10,°%; pounds of cast brass 
of that temperature for its production. It was observed that the vio- 
lence of agitation, when brass was employed, appeared to be much 
greater than when similar masses of iron were the subjects of experi- 
ment. ‘This was attributed to its hi gher conducting power. A repe- 
tition of this series might not exhibit precisely the same results, un- 
less the specimens employed should have the same proportion of in-~ 
— and the same specific gravity. 
SEVENTH SERIES, — 
Wings of standard silver, of various weights, from oH to so 
: ounces avoirdupois. 
ag “Ts Tee 
}sei/ae] 2 .|sa|as 
f2e;E] 23 |o2].0% 
Sets] 23 | gees. 
5 83 g £2 183) % o | Heat observed. Remarks. 
Sieele| SE leolead : 
Simslo| 3 |28| 88 
s}S5/ 8) 22/80 ) 
eB o |e ij {se 3 
a1 § Com oral. Immersed by de- 
14195 ol10 ip ¥: 
5{120|10. —_|.0511}19.550 } Cad To: reas 
2} 26.5! 30] 1.375 |.0519|19.272| © Do. ~— | ‘Do, at once. 
3} 26.5] 33! 1.5 _|.0566]17.666| .. Do. - o. Do. 
4; 26.5, 30] 1.75 |.0660)15.143) Clear red. {| Do. Do. 
5} 26.5] 32] 1.75  |.0660|15.143 Do. § Do. sae gradu- 
6! 41.2) 50] 3.0625|.0740|13.453} Do. Do. at once. 
7 41.2 5s 3.125 |.0758/13.120| Full red Do. Do. 
81195.5/130]15. —_|.0767/13.033} ‘Do. Do. gradually. 
9} 21.5] 30} 1.75 |.0814/12.286} ‘Do. o. at once 
10; 41.2) 68) 3.5 -|.0849}11.771 Do. Do. gradually. 
Do. at once; sil- 
11) 26.5) 30| 2.5 |.0943|10.600| Bright red. |) _ ver beginning 
ae. to soften. 
From a eoinparison of the three experiments marked comparable, 
in the above table, it appears that about 18,°,%; pounds of standard 
sis will be required for generating one cone of steam. “ 
