VI. METALLURGY.--The Treatment of Quicksilver Ores in Spain. 4977

VII. AERONAUTICS.--The Balloon in Aeronautics. 4977

VIII. BIOGRAPHY.--Franz Liszt.--Large Portrait. 4981

* * * * *




IMPROVED FIFTEEN TON CRANE.


[Illustration: Engraving.]

[Illustration: Side and Top View Plans.
IMPROVED FIFTEEN TON TRAVELING CRANE.]

The machine illustrated on first page has been constructed for Port
Alfred Harbor, this being one of several harbors now being made by Sir
J. Coode in South Africa. The pier for the construction of which the
crane will be employed will consist of concrete blocks laid on what is
known as the "overend system." The blocks, being brought on trucks
direct from the block yard to within the sweep of the machine, are
raised by it, swung round, and accurately set, the machine being
continually traveled forward as the work advances. The bottom blocks
are laid on bags of concrete previously deposited by the crane out of
boxes with flap bottoms.