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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

Progress of Western Mining Operations

Our September Export Edition

Novel Applications of Dynamite

A Remarkable Wasps' Nest

The Restoration of Cuba

The Boston Whittling Schools

The American Prizes at Paris


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

Red Bird of Paradise

The Bearded Saki

The Torrey Botanical Club

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

    Business and Personal

  • Notes and Queries

  • Index of Inventions

  • Patents

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October 12, 1878

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