Feature

Tree Production Speed-up by Wires, Cutting Roots

Books of the Week

Search for Scientists

New Machines and Gadgets

Ills Show in Fingerprints

Hums of Transformers Can Be Controlled

Mica Flakes Are Secret of “Sandwich” Paint

Foundation Board Named

Detector of Flaws in Rail Joints Makes Travel Safer

Fluoridation Cuts Caries

Warmer and Drier November for U. S.

Typewriter Makes Sheet Music Symbols