STEEL CASTINGS,

From ¼; to 10,000 lbs. weight, true to pattern, sound and solid, of

unequaled strength, toughness and durability. An invaluable substitute

for forgings or cast-iron requiring three-fold strength. Send for

circular & price list.

CHESTER STEEL CASTINGS CO., Evelina St., Phila, Pa.

* * * * *

[Illustration: STEEL WIRE OF EVERY DESCRIPTION

& STEEL SPRINGS.

CARY & MOEN

234 W. 29. ST.

NEW YORK CITY]

* * * * *

SHAFTS, PULLEYS, HANGERS, ETC.

Full assortment in store for immediate delivery.

WM. SELLERS & CO.,

79 LIBERTY STREET, NEW YORK.

* * * * *

THE LEHIGH VALLEY EMERY WHEEL CO.,

WEISSPORT, Carbon Co., Pa.

Manufacturers of Wheels and Machines.

* * * * *

CENTENNIAL AND PARIS MEDALS.

MASON'S FRICTION CLUTCHES AND ELEVATORS.

"New and Improved Patterns." 20 per cent. off list.

VOLNEY W. MASON & CO., Providence, R. I., U.S.A.

* * * * *

Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 152 / 162 题