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Relation Between the Grate Surface and the Heating Surface of Boilers

Magnesian Lime Vs. Pure Lime for Mortar

Wages and the Cost of Living

The Restoration of Cuba

A Remarkable Wasps' Nest

Novel Applications of Dynamite

Our September Export Edition

The American Prizes at Paris

Progress of Western Mining Operations

The Boston Whittling Schools


New Electrical Diapason

Hastie's Water Engine

Reynier's New Electric Lamp

Bauer's Steel Restoring and Refining Compotind

Simple Telephones

New Breech-Loading Rifle

A New Nut Lock

The Torrey Botanical Club

The Bearded Saki

Red Bird of Paradise

Astronomical Notes

Penn Yan, N. Y., Saturday, October 12, 1878. The Following Calculations Are Adapted To The Latitude Of New York City, And Are Expressed In True Or Clock Time, Being For The Date Given In The Caption When Not Otherwise Stated...

By Berlin H. Wright

A Platform Scale of Constant Equilibrium

New Stethoscopic Microphone

Communications Received


  • Departments

    Notes and Queries

  • Business and Personal

  • Index of Inventions

  • Patents

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