COVERING

WITH "AIR SPACE" IMPROVEMENT. Saves 10 to 20 per cent. CHALMERS SPENCE

CO., Foot E. 9th St. N.Y.; 1202 N. 2d St., St. Louis, Mo.

* * * * *

The HOADLEY

PORTABLE STEAM ENGINE.

WITH AUTOMATICAL CUT-OFF REGULATOR

AND BALANCED VALVE

THE BEST AND MOST ECONOMICAL ENGINE MADE

_SEND FOR CIRCULAR_

The J.C. HOADLEY CO. LAWRENCE, MASS.

STATE WHERE YOU SAW THIS

* * * * *

IMPORTANT FOR ALL CORPORATIONS AND MANF'G CONCERNS.--BUERK'S

WATCHMAN'S TIME DETECTOR, capable of accurately controlling the motion

of a watchman or patrolman at the different stations of his beat. Send

for circular. J.E. BUERK, P.O. BOX 979. BOSTON, MASS.

N.B.--The suit against Imhaeuser& Co., of New York, was decided in my

favor, June 10, 1874. Proceedings have been commenced against

Imhaeuser & Co. for selling, contrary to the order of the Court.

Persons using clocks infringing on my patent, will be dealt with

according to law.

* * * * *

Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 177 / 203 题