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State Laws Affecting Patents

Water Glass

The Great Comet Now in Sight

The Stephenson Centenary

Mechanical Inventions

Improved Feed-Water Regulator

Novel Cattle Ringer

Improved Air Pump

Improved Wagon Spring

Explosion of a Plain Cylinder Boiler in Philadelphia

By S. N. Hartwell

An Interesting Boiler Experiment

Expansion Voltameter

By M. Hopkins

Improved Car Truck

The Electric Boat

The Faure Battery--Stored-Up Electricity

The Prospects and Present State of Photo-Graphy in Natural Colors

Communications Received


  • Departments

    Correspondence - July 9, 1881

  • New Inventions - July 9, 1881

  • Business and Personal - July 9, 1881

  • Notes and Queries - July 9, 1881

  • Index of Inventions - July 9, 1881

  • New Books and Publications - July 9, 1881

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