The Project Gutenberg EBook of Scientific American Supplement, No. 799,
April 25, 1891, by Various

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Title: Scientific American Supplement, No. 799, April 25, 1891

Author: Various

Release Date: March 22, 2004 [EBook #11649]

Language: English

Character set encoding: ASCII

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[Illustration]

SCIENTIFIC AMERICAN SUPPLEMENT NO. 799

NEW YORK, APRIL 25, 1891

Scientific American Supplement. Vol. XXXI, No. 799.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

* * * * *

TABLE OF CONTENTS.

I. ARCHITECTURE.--Marble and Mosaic.--By T.R. SPENCE.--A
paper recently read before the Architectural Association, London,
containing valuable suggestions for designers of buildings.

The St. Lawrence Hospital for the Insane.--A New York State
hospital recently built from designs by the State architect.--Full
description.--1 illustration.

II. BOTANY.--Lavender and its Varieties.--The history, properties,
and technology of this plant.--2 illustrations.

III. CHEMISTRY.--A Projecting Apparatus of Precision.--A useful
adjunct for the chemist's balance, accelerating the operation of
weighing.--1 illustration.

Spectrum of the Sun and Elements.

Allotropic Forms of Metals.

IV. HYDRAULICS.--The Power of Water, or Hydraulics Simplified.
--By G.D. HISCOX.--Current wheels for power and raising water.
Interesting presentation of this practical portion of the subject.
--4 illustrations.

V. MECHANICAL ENGINEERING.--Compressed Air Production.--
By WM. L. SAUNDERS.--A Sibley College lecture, giving full
elaboration to this important subject.--The various forms of
compressors and general features of the service.--18 illustrations.

Improved Pneumatic Hammer.--A suspension hammer capable
of delivering 500 blows per minute.--8 illustrations.

The Thermic Mot