74

II. ELECTRICITY, ETC.--Electricity. What it is and what may be
expected of it. By JACOB REESE. 4974

Electric Light Apparatus for Photographic Purposes. By A.J.
JARMAN. 2 figures. 4976

Desruelles's Electric Lighter. 1 figure. 4976

Solenoid Underground Wires in Philadelphia. 4976

Dr. Herz's Telephonic Systems. 2 figures. 4976

Decision of the Congress of Electricians on the Units of
Electric Measures. 4977

Secondary Batteries. By J. ROUSSE. 4977

III. TECHNOLOGY AND CHEMISTRY.--Domestic Sugar Production. 4980

M. Garnier's New Methods of Photo-Engraving. By Major J.
WATERHOUSE.--Photogravure.--Photograph printing by
vapor.--Atmography. 4982

Dangers of Pyrogallic Acid. By DR. T.L. PHIPSON. 4982

IV. ARCHITECTURE, ETC.--Artists' Homes, No. 12.--Wm. Emerson's
house, Little Sutton, Chiswick.--Full page illustration and
large size longitudinal section. 4978

Memorable English Houses. 4 figures.--Newton's house.--
Flaxman's house.--Canning's house.--Johnson's house. 4980

V. GEOGRAPHY.--Herald Island.--On the summit.--A midnight
observation.--Plant life on Herald Island.--Inhabitants of
the cliffs. 4980

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 accura