NEW YORK, APRIL 4, 1885
Reading edition
Scientific American Supplement. Vol. XIX, No. 483.
Scientific American established 1845
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
TABLE OF CONTENTS.
I. CHEMISTRY AND METALLURGY.—The Determination of Graphite in Minerals.—By J.B. MACKINTOSH.
Sulphocyanide of Potassium.
Sugar Nitro-glycerine.
On Remelting of Cast Iron.
The Hardness of Metals.
II. ENGINEERING, ETC.—The Jet Ventilator. 4 figures.
Feeding Boilers at the Bottom. 2 figures.
The Honigmann Fireless Engine.—The fireless working of steam engines by means of a solution of hydrate of soda.—With several figures and diagrams.
Simple Methods of Calculating Stress in Girders.—By CH. LEAN.—With full page of illustrations.
A Spring Motor.
Steam Yachts.
III. TECHNOLOGY.—Foucault's Apparatus for Manufacturing Illuminating Gas and Hydrogen. 2 figures.
The Circle Divider.
Soluble Glass.—Process of manufacture.—Use.
Iron Printing and Microscopic Photography.—Formulas for printing solutions.—Compound negatives.
Practical Directions for Making Lantern Transparencies.—By T.N. ARMSTRONG.
Casting Chilled Car Wheels. 6 figures.
IV. ELECTRICITY, ETC.—Electricity and Prestidigitation. 2 figures.
Portable Electric Safety Lamp. 6 figures.
The Electric Discharge and Spark Photographed Directly without an Objective. 6 engravings.
V. PHYSICS, ETC.—The True Constant of Gravity.
Origin of Thunder Storms.
Physics without Apparatus.—Manufacture of illuminating gas.—Elasticity of bodies. 2 figures.
Scientific Amusements.—Dance of electrified puppets.—Silhouette portraits. 2 figures.
A Sunshine Recorder. 2 figures.
VI. MEDICINE, HYGIENE, ETC.—How Cholera is Spread.
Sulphurous Acid and Sulphide of Carbon as Disinfecting Agents.—Methods of burning the same.
VII. MISCELLANEOUS.—Improvised Toys.—With numerous illustrations.
The Æolian Harp.—Kircher's harp, made in 1558.—Frost and Kastner's harp.—Manner of making the harps. 4 figures.
How to Break a Cord with the Hands. 1 figure.
An Aquatic Velocipede for Duck Hunting. 2 engravings.
Skeleton of a Bear Found in a Cave in Styria, Austria.
VIII. BIOGRAPHY.—Theodor Billroth, Prof, of Surgery at Vienna.—With portrait.