--By G. GORE. 7070
II. ENGINEERING, MECHANICS, ETC.--Air Refrigerating
Machine.--5 figures. 7071
A Gas Radiator and Heater. 7071
Concrete Water Pipes. 7071
The Sellers Standard System of Screw Threads. Nuts, and
Bolt Heads.--A table. 7072
An English Railway Ferry Boat.--3 figures. 7072
The Problem of Flight and the Flying Machine. 7072
III. TECHNICAL.--Concrete Buildings for Farms.--How to construct
them. 7063
What Causes Paint to Blister and Peel?--How to prevent it. 7063
Olive Oil.--Difficulties encountered in raising an olive
crop.--Process of making Oil. 7064
IV. ELECTRICITY. ETC.--Telephony and Telegraphy on the Same
Wires Simultaneously.--4 figures.
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