Produced by Don Kretz, Juliet Sutherland, Charles Franks and the DP Team
Scientific American Supplement. Vol. XIX, No. 483.
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
I. CHEMISTRY AND METALLURGY.--The Determination of Graphite in Minerals.--By J.B. MACKINTOSH.
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.
III. TECHNOLOGY.--Foucault's Apparatus for Manufacturing Illuminating Gas and Hydrogen. 2 figures.
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.
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.
Physics without Apparatus.--Manufacture of illuminating gas.--Elasticity of bodies. 2 figures.
Scientific Amusements.--Dance of electrified puppets.--Silhouette portraits. 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.
The illustrations and descriptions we give this week, entitled "How to Break a Cord," "Prestidigitation," "Circle Divider," "Sulphurous Acid," "Production of Gas," "Aquatic Velocipede," "Several Toys," "Scientific Amusements," are from our excellent contemporary _La Nature_.