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Improved Machine for Drilling Stone

The Reynolds Air-Tight Heater

Science Familiarly Illustrated

Protection of Buildings Against Fires

How to Test the Purity of Water

Wagner's Improved Dinner Pail

Possibility of Speech by Those Hitherto Considered Mutes

Manufacturing Mining and Railroad Items

The United States Assay Office in New York

Recent American and Foreign Patents

Barometers as Indicators of the Weather

Extension Notices

Answers to Correspondents

New Publications

Turner's Rotary Steam Engine

Ornamental Petroleum Stove

The Oscillating or Variable Eccentric Motion

To Advertising Correspondents --Axes to Grind

Grindstones--their Actual and Possible Uses

The Cooper Union in New York


Why a Long Screwdriver Impels a Screw More Easily Than a Short One

Editorial Summary

New Engraving Lathe

Construction of Fire-Proof Buildings

Magnified Photographic Pictures

Official Report of Patents and Claims


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