308 On ‘the Ropia Praduton o ae Steam. xr TE ae ‘ 
not merely to supersede the use ¢ fis deal, ‘but ‘Bil 
reserving the tree ed the p r pride” 
Bs: 
this isl the r war oO 
a P 'SOMAS Lawrence stands’ oily ps 
tive artists, and pemePs - amiong artists, of the whole wor d, 
- -portraits—not - the servile copies of individual features, but 
- likenesses, where every excellence is heightened, where the mind is | 
the others, where all is imaginary. 
; Arr. XIV ~—Observations and Experiments on the rapid production 
Baap Re ¥ 
+) shan 
= oe 
I esteemed 
nstruction of ea 
: es 
n the 
> : = % 
eeminent am 
depictured, and where the particular . person seems to embody the * 
ee class of virtues, of intellectual powers, or of amiable <a desig- 
nating the moral order in which he is arranged. 
This constitutes unquestionably a department of historical paint- 
ing, not inferior, perhaps, nor even less difficult of bebe than 
The name of Reynolds must, and for various reasons, _ ever vill 
stand first -on the list of those who have cultivated in this country, the 
t of an art, the most refined, requiring talents the most — 
he same time the most delightful of all that have sprung q 
iman mind ;—but that of Lawrence will be hailed by the 
Academy as their Spes altera, and their Decus zemellum. | 
es ‘ ‘ . , 
of Steam in contact with metals at a high temperature ; by 
ter R. JouNSON, Professor of Hedhaniss and Natural P biloso- | 
— in the Franklin Knapitute; Philadelphia. | 
| 
j 
By a reference to the buinibér of this Journal. for nie of the 
present yours the reader will find an account of the method ‘of per- 
forming the ‘experiments detailed in the following pages. From 
data. there’ furnished, we may readily calculate the quantity of steam, 
of atmospheric pressure, which would be generated by any k known | 
quantity of iron that should become red hot. Thus, should a boiler | 
twenty feet long and thirty inches in diameter, with a returniBg flue 
one foot in diameter, be constructed’ of iron one fourth of an ine 
ive a curved surface of 157 square 
bf fod Boiler iron is 7:770, % Ot 
quare foot. “The - whole exterior : 
eee _ 
