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Single-Rail Railway

Sinking Shafts through Quicksands by Freezing

Improved Safety Valve

Lathe for Manufacturing Spokes

Smoke Burning Furnaces

By Frank C. Smith

The Generation of Steam and the Thermodynamic Problems Involved

By W. Anderson

The New Post Office, Minneapolis

Computing the Heating Surface of Hot Blast Stoves

A Water Pyrometer

Artisans' Dwellings, Hornsey

Dufour's New Registering Barometer


The Cost of Electric Batteries

An Easily-Constructed Microphone

The Electric Tricycle

Electrical Conductors

General Sutter's Account of the Original California Gold Find

A Simple and Sensitive Thermostat

By N. A. Randolph

New Zealand Scenery—Lake Hawea

The Java Earthquake

The Kaibab, Grand Canon of the Colorado River, U. S. A

Parallel Curves

By C. W. MacCord

Method for Preparing Uranic Nitrate or Acetate from the Residues

By J. T. Savory

The German Carp, and its Introduction in the United States

By Chas. W. Smiley

A Camera Lucida

Selenium in Sulphuric Acid

By Drinkwater

The Chinch-Bug


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