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The Ancient Cities of Yucatan

Automatic Firing Guns


By Hiram Stevens Maxim

Wood Paving Block Machinery

Circulation in Water Tube Boilers

By W. H. Watkinson

Garwood's Line throwing Gun

Some Horseless Carriages

New Fresh Water Distilling Apparatus

Electrical Notes

Engineering Notes

Miscellaneous Notes

A Camera Swingback Indicator and how to make It

By F. C. Lambert

Selected Formulæ

Acetylene for Domestic Lighting

Tests of the Baltimore Electric Locomotive

Present and Prospective Development of Electric Tramways

The Rational use of Cocaine in Surgery

By Claude A. Dundore

A Short Cipher Code for Commercial Uses

By Edward S. Holden

Optical Effects of Parallel Lines



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