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Retrospect of the Year 1909
Electrical Heat Penetration
By Alfred Gradenwitz
Oxygen and Human Energy
By John B. Huber
An Automatic Apparatus for Projecting Pictures
By Jacques Boyer
The Current Supplement, A Correction
The Great St. Bernard Hospice
By Harold J. Shepstone
David Starr Jordan
By Marcus Benjamin
The Rignoux-Fournier System of Television
By Fernand Honore
The Heavens in January
Recently Patented Inventions - January 1, 1910
Index of Inventions - January 1, 1910
New Books, Etc. - January 1, 1910
Notes and Queries - January 1, 1910
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