Milk and What Comes of It

*Improved Hay Elevator

*Improvement in Lamp Wicks

Great Transformation

Answers to Correspondents

Recent American and Foreign Patents

New Books and Publications

List of Patents

* * * * *




Engines of the Spanish Gunboats.


In our description of these boats in No. 25, Vol. XXI., special mention
was made of the compactness of the engines.

It has frequently been urged as an objection against the twin screw
system that the double set of engines, four steam cylinders with
duplicates of all the working parts called for on this system, render