37 & 38 PARK ROW, NEW YORK.

* * * * *

[Illustration]

Watchman's Improved Time Detector, with Safety Lock Attachment, Patented

1875-6-7. Beware of Infringements. This Instrument is supplied with 12

keys for 12 different stations. Invaluable for all concerns employing

night watchmen. Send for circulars to E. IMHAUSER, P. O. Box 2875. 212

Broadway, New York.

* * * * *

Mill Stones and Corn Mills.

We make Burr Millstones, Portable Mills, Smut Machines, Packers, Mill

Picks, Water Wheels, Pulleys, and Gearing specially adapted to Flour

Mills. Send for catalogue.

J. T. NOYE & SONS, Buffalo, N. Y.

* * * * *

THE NEW PULSOMETER Is more economical in points of original cost,

expense for repairs and running expenses, than any other Steam Pump in

the World.

[Illustration]

Simple and compact, with no machinery whatever to oil, or get out of

order, it stands at the head of all means of elevating water or other

liquids by steam. _It needs no skilled labor to look after it._

Send for book giving full description, reduced prices and many letters

of commendation from leading manufacturers and others throughout the

country who are using them.

Pulsometer Steam Pump Co., Sole Owners of Hall's Patents in the U. S.,

131,515 to 131,543, both inclusive, and the NEW PULSOMETER, Office, No.

83 John St., P.O. Box No. 1533. New York City.

* * * * *

Pictet Artificial Ice Co., Limited, P.O. Box 3083 142 Greenwich St., New

York. Guaranteed to be the most _efficient_ and _economical_ of all

existing Ice and Cold Air Machines.

* * * * *

H.W. JOHNS' ASBESTOS LIQUID PAINTS, ROOFING, Steam Pipe & Boiler

Coverings, Steam Packing, Mill Board, Sheathing, Fire Proof Coatings,

&c.

Send for Descriptive Price List.

Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 138 / 165 题