Chapter II: ENGINEERING AND MECHANICS.--The Use of Iron in Fortification

--Armor-plated casements.--The Schumann-Gruson chilled iron
cupola.--Mougin's rolled iron cupola.--With full page
of engravings

High Speed on the Ocean

Sibley College Lectures.--Principles and Methods of Balancing
Forces developed in Moving Bodies.--Momentum and centrifugal
force.--By CHAS.T. PORTER.--3 figures

Compressed Air Power Schemes.--By J. STURGEON.--Several
figures

The Berthon Collapsible Canoe.--2 engravings

The Fiftieth Anniversary of the Opening of the First German
Steam Railroad.--With full page engraving

Improved Coal Elevator.--With engraving