211 
er in a manner that may be stiled, a la bayonnele . The low¬ 
er part, which ought to be at least 4| inches in height, 
is fixed immoveably to the centre of the circular base of the 
lamp. At the upper part, is the principal reservoir which 
is circular, in the form of a hollow ring, and surrounding and 
embracing the supporter. As this hollow ring which serves 
as a reservoir, embraces the supporter, it is necessarily of the 
same diameter, both its top and bottom, its height (which 
forms the depth of the reservoir) is nine lines and its great¬ 
est exterior diameter, which is below, is three inches and 
eight lines. The opening of the wick-pipe at its superior 
extremity is three lines higher than the level of the upper 
part of the reservoir. 
The exterior surface of this hollow ring is rounded in 
such a manner, as to give it, when viewed sideways, the ap¬ 
pearance of a half globe flattened. 
It is from the external partition of this ring, where it is 
rounded, that the handle proceeds horizontally. This very 
essential part, which is hollow, is made of tin, and serves 
not only as a handle, but also as a second reservoir for con¬ 
taining the oil. It is from four to five inches long, about 
fifteen lines broad, and nine lines thick. It is varnished 
black, to give it the appearance of a handle of ebony. The 
upper part which is flat, proceeds horizontally to join the 
top of the supporter and covers a part of the circular reser¬ 
voir. In this flat part, above the part of the reservoir thus 
covered, there is a circular opening, eight lines in diameter, 
through which the reservoirs are filled with oil, and which 
is closed by a button of copper. 
The oil enters directly into the circular reservoir and 
from thence passes into the handle by means of a horizontal 
pipe (three lines in diameter) through a vertical partition 
which divides the cavity of the handle from that of the cir¬ 
cular reservoir. This pipe which is open and is about three 
or four inches long, is fastened by one of its extremities 
into the partition, very near the bottom of the reservoir, and 
