Volume 23, Issue 574supp
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Features
Instruments for Drawing Curves
Hydraulic Hoisting Carriage for Purifier Covers
Some Type Writers—Their Origin and Uses
An Absolute Barometer
Instantaneous Photography
The First Type Writing Machine
The Strength of Fly-Wheels
The SS. Nulli Secunda
Concrete in Harbor Work
Benz's Gas Motor
Unsuspected Dangers with Frictional Electricity in Blasting
Pure Ice and Snow
Solution
Opening of the Discussion by Prof. Tilden