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Manufacturers of Cooking, Heating & Ventilating Apparatus,

293 WATER STREET, NEW YORK.

Chitson's Patent Improved Cone Furnace, for Heating Schools, Churches and Private Buildings. Six Sizes Portable. Four sizes to set in Brick Work.

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BRAMHALL, DEANE & CO.

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Air Pumps, Electrical Machines, Ruhmkorff Coils,
GEISSLER TUBES,

Mathematical Drafting Instruments, Drawing Paper, Lead Pencils, Microscopes, Magic Lanterns, &c.

Would call special attention to the new

EATON DIRECT VISION SPECTROSCOPE.

THE LATEST AND MOST VALUABLE INVENTION FOR SCIENTIFIC RESEARCH.

Fully Illustrated and Priced Catalogues, sent per Mail on receipt of ten cents each. Part 1st-MATHEMATICAL INSTRUMENTS. Part 2d-OPTICAL INSTRU MENTS. Part 3rd-MAGIC LANTERNS AND VIEWS. Part 4th-PHILOSOPHICAL

INSTRUMENTS.

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