XII. TECHNOLOGY.--Furnace for Decomposing Chloride of Magnesium.--Furnace
with rotating chamber for use by alkali manufacturers.--1
illustration.

Notes on Garment Dyeing.--The production of blacks on silk and
wool.--Formulas for mordants.

Studies in Pyrotechny.--II. Methods of Illumination.--Continuation
of this valuable treatise.--9 illustrations.

The "Sensim" Preparing Box.--New machine for treatment of
fiber.--An improvement on the ordinary gill box.--3 illustrations.

* * * * *




THE RETIRO VIADUCT.


We give engravings of the viaduct over the river Retiro, Brazil, our
illustrations being reproduced by permission from the Proceedings of the
Institution of Civil Engineers. In a "selected paper" contributed to the
volume of these proceedings just published, Mr. Jorge Rademaker Grunewald,
Memb. Inst. C.E., describes the work as follows:

[Illustration: VIADUCT OVER THE RETIRO, BRAZIL.]