Volume 6, Issue 138supp
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Features
M. Giaffe's Modification of Edison's Carbon Telephone
Jablochkoff's Dynamo-Electric Machines
On a New Method of Detecting Overstrain in Iron and Other Metals, and on its Application in the Investigation of the Causes of Accidents to Bridges and Other Constructions
The Paris Exhibition—Jurors Representing the United States
A Fifty-Year Old Wooden Bridge
Steam and Check Valves at the Paris Exhibition
Labor in France
New Torpedo Boats
New Furnace Feeder at the Paris Exhibition
The Portuguese Photographic Printing Process
Heliogravure After the Copperplate Style
Brotherhood's Compound Engine at the Paris Exhibition
Specific Gravity
Instantaneous Photography
Photo-Engraving
Medical uses of Carbolic Acid
Strumous Disease Treated by Volcanic Vapors
The Alkaline Treatment of Burns and Scalds
Danger from Hypodermic Injection of Morphia
Diseases of the Ear from Bathing
The New Dental Departure
Recent Progress of Entomology in North America
A Fatherless and Motherless Race
The Enemies of Books
Their Natural History—Their Ravages—The Methods of Destroying Them