I. ASTRONOMY.--A Star Finder.--A simple apparatus that can be
constructed by any mechanic.--1 illustration.
Photographic Study of Stellar Spectra, Harvard College Observatory.
--First annual report of the Henry Draper memorial observations.
--Review of the work by Prof. EDWARD C. PICKERING.
II. BIOLOGY.--Sponges.--The growth and life history of sponges.--Report
of a recent lecture at the London Royal Institution by Dr.
R. VON LEDENFELD.
III. ELECTRICITY.--Phenomena of Alternating Currents.--By Prof.
ELIHU THOMSON.--16 illustrations.
IV. ENGINEERING.--An English Car Coupling.--Description of an
English automatic coupling.--2 illustrations.
A New Process of Casting Iron and other Metals upon Lace,
Embroideries, Fern Leaves, and other Combustible Materials.
--By A.E. OUTERBRIDGE, JR.--A new and eminently practical
process of producing ornamental castings.--4 illustrations.
Bricks and Brick Work.--By Prof. T. ROGER SMITH, F.R.I.B.A.
--The history and technical review of this subject.--A most
remarkable contribution to the engineering of architecture.
Link Belting.--By CHARLES A. SCHIEREN.--An interesting and
practical paper on leather belting made of links.
--9 illustrations.
Recent Progress in Gas Engineering.--A lecture by Mr. A.
MACPHERSON, of Kirkcaldy, reviewing the last improvements
in this branch.
V. MISCELLANEOUS.--Herbet's Tepid Douche.--Apparatus in use
for bathing soldiers in the French barracks.--1 illustration.
Kent's Torsion Balance.--A new type of balance, involving
torsional suspension instead of knife edges.--5 illustrations.
Preservative Liquid.--Note on preservation of organic
substances.
The Falls of Gairsoppa.--The great Indian falls, higher than
Niagara.--2 illustrations.
The New British Coinage and Jubilee Medal.--Illustrations and
descriptions of the new pieces.--8 illustrations.
The Winner of the Derby.--Portrait and description of Merry
Hampton.
VI. NAVAL ENGINEERING.--The Falke Type Torpedo Boat.--The fastest
type of British torpedo boat, constructed by Messrs. Yarrow
& Co.--1 illustration.
The German Navy.--The New Gunboat Eber.--A description of
a late accession to the German navy.--1 illustration.
VII. ORDNANCE AND GUNNERY.--Magazine Rifles.--Continuation of
this important article, including the Chaffee-Reece,
Kropatschek, and other magazine guns.--3 illustrations.
New British Torpedo Experiments.--Experiments with torpedoes
against a ship.--The efficiency or torpedo nets.--The effects of
Whitehead torpedoes.
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