Table of contents
Recently Patented Inventions
Notes and Queries
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Letter Canceling Machines at the New York Post Office - pp241 - 242
doi:10.1038/scientificamerican04181896-241
Combined Gas Engine and Centrifugal Pump - p244
doi:10.1038/scientificamerican04181896-244a
Magnetographs Made by Radiations from the Poles of a Magnet - p249
John S. McKay
doi:10.1038/scientificamerican04181896-249
Simple Method for the Measurement of Electric Current - p250
Ichiro Goto
doi:10.1038/scientificamerican04181896-250
Straightening a Leaning Chimney One Hundred Feet High - p251
doi:10.1038/scientificamerican04181896-251