Skip to main content

Features

Pigs and Babies

The Utilization of Knowledge

The American Fish Culturists' Convention

An Invention Wanted for Utilizing Flax Refuse

Charges for Handling Grain in New York Harbor

The International Exhibition of Electricity at Paris, 1881

New Embroidering Frame

New Perforating Machine

American Industries.--No. 71

The Reese Fusion Disk

Miscellaneous Inventions

The Velocipede Hand Car

Improved Refrigerator

Simplified Holtz Electrical Machine

By Geo M. Hopkins

Lavater's Apparatus for Taking Silhouettes

Mechanical Inventions

Departments

  • Departments

    Correspondence

  • Recent Inventions

  • Notes and Queries

  • New Books and Publications

  • Business and Personal

  • Index of Inventions

Purchase To Read More

Already purchased this issue? Sign In to Access
Select Format
April 16, 1881

Beyond XX and XY

Biology. Identity. Equality.