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Improved Bridge Construction

Important Changes Proposed in the British Patent Laws

A New Machine for Removing Snow from Streets

Progress of Rapid Transit in New York

Kaolin in the United States

Another Earthquake Indicator

Amalgams for Filling the Teeth

Test of American Iron and Steel

Scientific and Practical Information - April 24, 1875

Dittman's Improved Locking Nut

Beckwith's Improved Lumber Dog

Apparatus for Determining the Impermeability of Tissues

A New Mercury Air Pump

The Anatifa

A New Tack Hammer

The Sun's Position at Different Seasons of the Year

A Chinese Patentee

Improved Shingle Machine

Improved Tanning Process

The Secretary Bird

The Wardian System of Plant Cases

The Modern Theory of Color

Decisions of the Courts - April 24, 1875

Recent American and Foreign Patents - April 24, 1875

Communications Received - April 24, 1875


  • Letters

    Correspondence - April 24, 1875

  • Departments

    Index of inventions - April 24, 1875

  • Notes and Queries - April 24, 1875

  • Business and Personal - April 24, 1875

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April 24, 1875

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