revolvers of the usual size. But the effect of one charging door in
front and three at the side, which after charging are "banked" up with
coal, with the exception of a small aperture above for admission of
air, is very similar to that sometimes adopted in the laboratory for
increasing heating effect by joining several Bunsen lamps together to
produce one large, powerful flame. In this case, the four charging
holes represent, as it were, the air apertures of the several Bunsen
lamps. Of course the one firing door at front would be totally
inadequate to supply and feed a fire capable of yielding a flame that
would be adequate for the working of so huge a revolver. As an effort
of chemical engineering, it is a very interesting example of what
skill and enterprise in that direction alone will do in reducing
costs, without in the least modifying the chemical reactions taking
place.--_Journal Soc. Chem. Industry._

* * * * *




IMPROVEMENTS IN THE MANUFACTURE OF PORTLAND CEMENT.[1]

[Footnote 1: A paper recently read before the British
Association.]

By FREDERICK RANSOMS, A.I.C.E.


So much has been said and written on and in relation to Portland
cement that further communications upon the subject may appear to many