312 Hare’s Gasometer. 
tion should almost lead one to imagine, that if mankind were 
all produced from one and the same stock,the black skins of 
the Ethiopians, &c. might possibly be owing originally to 
some such accidental cause.” —See Edwards’ Plate 212. 
MECHANICS AND THE ARTS—PHYSICS AND 
CHEMISTRY. 
—_>— 
Arr. IX.—Account of an improved mode of suspending 
Gasometers ; by Dr, Hare.* an, 
It is well known to all who are conversant in gas light ap- 
paratus, that no mode has beenheretofore devised to render 
Gasometers accurately equiponderant at all points of their 
immersion in the water ; a circumstance so indispensable to 
their action. | 
The modeusually adop- 
_ ted'in the English Estab- 
- lishment, is that of. the 
(-\~ Gasometer chain. | This 
BO et Th feet is costly ,and difficult to ex- 
Pre =.,-ecute well, or. to, correct, 
i ~~... when erroneously propor- 
=. tioned. to. the desired. ef- 
é\.fect.. The plan of sus- 
N™pension on a. beam, like 
© that in the annexed cut, 
' has in practice been found 
yo answer perfectly. Being once executed, it requires no 
further attention. The rationale of the operation of sucha 
beam, will be evident from the method of constructing one 
which I shall proceed to explain. | ; 
Find. (by tial, if possible ; if not, by  calculation,) the 
weight of the Gasometer when sunk so low, as that the top 
will be as near as possible to the water, without touching it. 
In.the same way find the weight of the Gasometer at the 
highest point of emersion, to which itis to rise, when in use, 
Then, as the weight in the last case, is to the weight in the 
pan: 
pay o> &* 
Gp CORRE ED 
ae 
»S 
ay 
* Published first in the Analectic Magazine for May, 1817. 
