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Features

The Half Launch Finished

Improved Marine Governor

One Hundred Tuns of Grass to the Acre

List of Patent Claims

How to Use the Divining Rod

Mechanics' Halls

County Patent Rights

Millstones--Their Speed and Setting

Draining the Everglades

Speed of Millstones

California Bituminous Springs

Managing Boilers

Alloys of Aluminum

Automatic Alarm for Locomotives

Burnap's Improved Pump

Burr Stone

Protection of Telegraph Cables

American Pearls

Scientific Farming

Sewing Machines

The Pacific Wagon Road

Galvanized Iron

Wants of California

Notes on Science and Foreign Inventions

The Secret of Success in Tempering Tools

Peruvian Bark

Camlet

The Desjardins Bridge Catastrophe

Correspondents

Important Items

Sarven's Patent Wood Bending Machine

The Frigate Niagara

Electricity for Discovering the Seat of Disease

Fall of a Suspension Bridge

Telegraph Cable Across the Hudson

To Make Yellow Ink

Mechanics

Departments

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    May 02, 1857

    Beyond XX and XY

    Biology. Identity. Equality.