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Features

Sanitary Trains

Etiology of Scarlet Fever

By E. Klein

Writing Apparatus for Engraving Small Figures

By A. Repsold and Sohne

Improved Hay Press

Asbestos Theater Curtain

The Development of the Mercurial Air Pump

By Silvanus P. Thompson

Eli Terry and the First Wooden Clocks

Wool Hat Making

A New Platinotype Process

Polishing Metals and Polishing Agents

Photo. Wrinkles

MOUNTING BOARD

By Alexander Kellar

Telescopes: their History and the Discoveries made with Them

The Galioscope

Universal Optical Apparatus

By V. L. Rosenberg

Hughes' Induction Balance

Electrical Telephone Boxes

Snow Hall of Natural History, at Lawrence, Kan

Preparation of Nitrogen and Analysis of Air by Nitric Oxide

By T. O*amp*apos;conor Sloane

Chemical and Allied Industries

Group VII.—Dyes and Coloring Matters from other Sources than Coal Tar

By Watson Smith

A Thermostat

By L. Rugheimer

Orsat's Apparatus

Estimation of Metallic Iron in Slag

By G. Neumann

Distilling and Maturing Alcohols

By J. Wallace

Zinc-Copper and Tin-Copper Alloys

By A. P. Laurie

Building Plans and Specifications

The Great Alpine Rockfoil

(saxifraga pyramidalis)

The Primitive Seat of the Aryans

By Isaac Taylor

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January 21, 1888

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