Page:Popular Science Monthly Volume 72.djvu/588

 Bausch & Lomb Optical Co.

Carl Zeiss Optical Works, Jena George N. Saegmuller

Offices: V*^

S B-

■L

^^ I Washington

New York \

Z

S

/ San Francisco

Boston \

/ London

Chicago

• /

Frankfurt a/M

Manufactory

and Executive Office

Rochest<

n, N. Y.

Eye Glasses

Engineering Transits

Lenses

Engineering Levels

Magnifiers

Theodolites

Reading Glasses

Chronographs

Field Glasses

Telescopes

Microscopes

Telescopic Sights

Microtomes

Range Finders

Projection Apparatus

Searchlight Mirrors

Photographic Lenses

Measuring Instruments

Photographic Shutters

Refractometers

Chemical Apparatus

Spectrometers

Photomicrographic Apparatu

i

Stereometers

A booklet entitled "A Triple Alliance in Optics" is now in press. It gives a detailed account of the association of interests of the three above mentioned firms and is designed for general distribution. If you do not receive a copy we shall be pleased to mail one on request.

Microscopes

For School

and

College Use

Can be imported free of duty at a saving of from 35 to 40% from the American prices. We import microscopes for the largest institutions in the country.

The New Reflecting Lantern

for showing on the screen opaque objects, book illustrations, engravings and lantern slides, is the most perfect instrument of its kind. It is in use at Harvard, Cornell, U. of P., Leland Stanford, Girard College and 500 other institutions.

Lantern Slides and Microscopic Slides

illustrating Botany, Geology and other sciences.

Lists on application.

WILLIAMS. BROWN & EARLE. Dept. N, 918 Chestnut St., Philadelphia, Pa.

WATSON & SONS'

MICROSCOPIC OBJECTS

Every Microscopist, no matter in what depart-, ment he may be interested, will find specimens of interest and rarity listed in Watson's Cata- logue of Microscopic Objects. It is a classified list representing a stock of more than

40,000 CHOICE SPECIMENS

Each guaranteed typical of the structure it represents. These slides are used for teaching and examination purposes throughout the world, The series comprise illustrations in Histology, Pathology, Zoology, Bacteriology, Hematology (including Malaria), Botany, Entomology, Geol- ogy, Diatomacese, etc., etc. Amateurs will find in this list many desirable additions for their cabinets, from Is. up.

The above list will be mailed free on request.

WATSON & SONS Microscope Manufacturers,

WHOLESALE AND RETAIL

313 HIGH HOLBORN, LONDON, ENGLAND

Established 1837. Awarded 42 Gold and other Medals

Microscopic Objects may be conveniently Sent

to the U. S. A. by parcel post.

American Agents: The Scientific Shop (A. B. Pobtbh) Rooms 1230 1245 Monon Building, 321 Dearborn Street, Chicago, through whom orders should be sen

QUALITY ~^"> HIGHER THAN PRICE, \

PRICE WITHIN THE REACH

OF ALL- I

COCOA

STANDS

UNEQUALLED

for PURITY AND

DELICIOUSNESS

OF FLAVOR.

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