Feature

Vacuum System Devised for Shoal-Water Propeller

Spreading Paralysis?

Noise Remedies

Nature Ramblings: Bears and Men

Concentrated Protein Extracted from Grass

Peepsight for Firearms Patented by Garand

Better Machine Harvester for Sugar Beets Invented

New Machines and Gadgets

Just off the Press

Front Matter

Microbe Rodent Killer

[Photograph]: Model Launching