secured like the needle, _a_, and for which the cylinder serves also
as pen holder, offers a great advance.

Thus a whole series of instruments can be used with the lens. For
instance, a naturalist can use with it a knife or other instrument. To
avoid injury from the instruments, one should, in laying down the
cylinder, place it on its side. It is also recommended that on the
outer tube of the frame, which is appropriately lacquered of black
color, white arrows should be placed in the direction of the points of
the instrument, so that the eyes shall be protected from injury in
handling the instrument, as by the points being stuck into the pupil,
owing to lifting the instrument in an inverted position.--_Zeitschrift
fur Instrumentenkunde._

* * * * *




BARLOW'S MACHINE FOR MOULDING CANDLES.


That style of machine for moulding candles in which the candles are
forced out at the top by means of a piston is the one most employed,
and it is an apparatus of this kind that we illustrate herewith. In
its construction, this apparatus presents some important improvements
in detail which it is of interest to set forth. The improvements made
by the Messrs. Barlow have been studied with a view of manufacturing
candles with conical ends, adapted to all chandeliers, without
interfering with rapidity of production or increasing the net cost.