Skip to main content

Features

The Manufacture of Valves

What to do Next Winter

How to Preserve Cider

Spirit Photographs

Changes in Photography

The Electrical Alarm Compass

Probable Opportunities for New Discoveries in Acoustics

The New Bureau of National Survey

Improved Pressing Machine

A New Railroad Tie

Improved Grinding Mill

Engineering Inventions

New Agricultural Inventions

A New Optical Delusion

Improved Nut Lock

Improvement in Saw Gumming

The Narica

Miscellaneous Inventions

Recent Mechanical Inventions

Communications Received

Departments

  • Departments

    Correspondence

  • Business and Personal

  • New Books and Publications

  • Notes and Queries

  • Index of Inventions

  • Patents

Purchase To Read More

Already purchased this issue? Sign In to Access
Select Format
August 09, 1879

Beyond XX and XY

Biology. Identity. Equality.