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Features

Trisecting The Impossible

Why the Angle Trisector is Wasting His Time . . . the Problem is Insoluble—Demonstrably So . . . But the Perennial Aspirant Works On and On

Junk To You

A Billion Dollar Industry in Scrap Metals . . . Revolving Resources Save Ore and Coal . . . The "Alloy Age" Has Introduced New Problems

By Philip H. Smith

Energy From The Sun

Step by Step Solar Engines Increase in Efficiency . . . May Reach Economical Level as a Power Source

Bone Surgery With Machine Tools

Grafting Bones is Much Like Grafting Trees . . . Bone from Your Own Body . . . Cut with a Circular Saw . . . Shaped on the Spot with a Bone Mill

By Fred H. Albee M.D., F.A.C.S.

And Now, The Atlantic

One of the Last Areas to be Conquered By Commercial Air Transport . . . Technical Advances Have Outrun Political and Industrial Plans

By Reginald M. Cleveland

Amateur Seismology

Half Amateur, Half Professional . . . Constant Battle . . . Listing the Difficulties . . . No Royal Road to this Scientific Hobby . . . Work . . . Work

By Albert G. Ingalls

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