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Features

Improved Machine for Drilling Stone

The Reynolds Air-Tight Heater

Science Familiarly Illustrated

How to Test the Purity of Water

Wagner's Improved Dinner Pail

Protection of Buildings Against Fires

Possibility of Speech by Those Hitherto Considered Mutes

Barometers as Indicators of the Weather

The United States Assay Office in New York

Recent American and Foreign Patents

Manufacturing Mining and Railroad Items

Answers to Correspondents

New Publications

Extension Notices

Ornamental Petroleum Stove

Turner's Rotary Steam Engine

The Oscillating or Variable Eccentric Motion

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

Uniformity

To Advertising Correspondents --Axes to Grind

The Cooper Union in New York

Grindstones--their Actual and Possible Uses

Construction of Fire-Proof Buildings

Editorial Summary

Magnified Photographic Pictures

New Engraving Lathe

Official Report of Patents and Claims

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June 20, 1868

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