Volume 59, Issue 1535supp
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Features
Epochs in Marine Engineering
The Manufacture of Bronze Colors
The Artificial Production of Rubies
The Steel Hardening Metals
Distance Control by Electric Waves
A Novel Conduit Line
By the Paris Correspondent of Scientific American
Producer-Gas Power Plants
Daytime Observations on the North Star
The Cultivation of Medicinal Plants
The N-Rays of M. Blondlot
Discovery