Features
Longer Daylight
Suburban Traffic in London and New York
Science
Electricity
Engineering
An English Electrically Operated Evaporative Condenser Plant
A New Electric Traveling Scale Crane
A Billiard Table for Ships
Second Honorable Mention Essay on the Fourth Dimension
The Number of our Ancestors
The Proposed Montreal Drydock
A New Scotch Elevating Ferry
Signaling to Mars
Constructing the Concrete Locks of the Panama Canal
Foods and Digestion
Handy Man's Workshop
Quick Means for Finding the Center of Shafts
Iceless Refrigeration
A Home-Made Saw Vise
A Weatherboard Gage
Departments
- Departments
Correspondence - July 17, 1909
Recently Patented Inventions - July 17, 1909
New Books, Etc. - July 17, 1909
Notes and Queries - July 17, 1909
