Volume 39, Issue 1007supp
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Features
A Semaphore Telegraph Station
The Electrical Transformer
New Alternating Current Arc Lamp
Reservoir Level Indicator
Mechanical Handling of Coal and Ashes
Gas Engines vs. Steam Engines
Berthon's Boats and Pontoons
Modern Photogravure Methods
The Duograph
Some Modern Methods of Lighting Compared
How Brass Musical Instruments are Made
Acetylene as an Illuminating Gas
A German View of the Subject
Improved Automatic Yarn Twister
The Flame Extinguishing Properties of Carbon Dioxide and Nitrogen
The Manufacture of Carbide of Calcium by Electrolysis
Combination Tones
Chemical Examination of some Commercial Varieties of Cacao
Contribution for the Chemical Laboratory of the Philadelphia College of Pharmacy. No. 138