body, and the indentation of the glass beneath, which, as will be
noticed, is made to follow the shape of the flame. It only remains now
to speak of the flame and its qualities. It is, in the first place, a
flame of hot gas, burning at an extremly small velocity of flow, and
wholly exposed to view from the exact point which it is required to
light. In this latter respect it differs materially, and with advantage,
from the Siemens burner, which, while presenting an extremely brilliant
and beautiful ball of flame outside its central tube of porcelain, may
yet be tailing smokily downward inside this opaque screen, and thereby
causing unperceived waste. The flame of the Grimston burner, on the
other hand, is quite exposed, and all its light, from the ends of the
burner-tubes to the point where visible combustion ceases, is made
available for use. As a perfect Argand flame in the usual position has
been likened in form to a tulip flower, so the flame of this burner
presents the appearance of an inverted convolvulus. So far as he has
already gone, Mr. Grimston prefers to keep the tubes of the burner at
such a distance from each other that the several jets part at the point
where they turn upward, so that the convolvulus figure is not maintained
to the edge of the flame. From its peculiar position the light is, of
course, completely shadowless as regards the lamp which affords it; and
this, of itself, is no small recommendation for a pendant. It shows well
for the simplicity and effectiveness of the perfected burners that Mr.
Grimston's experimental example, although necessarily imperfect In many
ways, burns with a remarkably steady light, of great brilliancy, which
is assured by the fact that the products of combustion are robbed of all
their heat to magnify the useful effect, so that the hand may be borne
with ease over the outlet of the chimney. With respect to the endurance
of the apparatus, it will be sufficient to remark that there is nothing
in the gas or air heating arrangements to get out of order, and they are
all easily accessible while the burner is in action. The glass is not