708 E Street, Washington, D. C.

* * * * *

FOR SALE.--LETTERS PATENT OF

Wilhide's Celebrated Noiseless Self-setting Rat and Mouse Traps.

Thoroughly introduced. Traps sold by all dealers. Address Owners and

Manufacturers,

J. T. WILHIDE & BRO., York Road, Carroll Co., Md.

* * * * *

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.

Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 97 / 162 题