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EBOOK SCIENTIFIC AMERICAN ***


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[Illustration]


SCIENTIFIC AMERICAN SUPPLEMENT NO. 312


NEW YORK, DECEMBER 24, 1881.
Scientific American Supplement. Vol. XII., No. 312.
Scientific American established 1845
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
* * * * *


TABLE OF CONTENTS.

I. ENGINEERING AND MECHANICS.--Improved Fifteen Ton Traveling
Crane. Designed for service in the construction of Port
Alfred Harbor. South Africa. 3 figures. 4967
Improved Steam Boiler. 1 figure. 4968
The Elevated Railways of New York. 4968
Some of the Developments of Mechanical Engineering during the
Last Half Century. British Association Paper. By SIR FREDERICK
BRAMWELL. The steam engine.--Evaporative condenser.--Steam
navigation.--Marine governors.--Light engines and boilers.--The
Perkins system.--Ether engine.--Quicksilver engine.--Locomotive
engines.--Brakes.--Motors.--Transmission of power.--Compressed
air locomotives.
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