The Project Gutenberg EBook of Scientific American Supplement, No. 810,
July 11, 1891, by Various

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Title: Scientific American Supplement, No. 810, July 11, 1891

Author: Various

Release Date: February 14, 2005 [EBook #15050]

Language: English

Character set encoding: ASCII

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[Illustration]

SCIENTIFIC AMERICAN SUPPLEMENT NO. 810

NEW YORK, JULY 11, 1891

Scientific American Supplement. Vol. XXXII, No. 810.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

* * * * *

TABLE OF CONTENTS.

I. BOTANY.--Cocos Pynaerti.--A new dwarf growing palm.--1 illustration.

II. CHEMISTRY.--The Application of Electrolysis to Quantitative
Analysis.--By CHARLES A. KOHN, B.Sc., Ph.D.--Applicability of
these methods to poison determinations.

III. CIVIL ENGINEERING.--The Kioto-Fu Canal in Japan.--A
Japanese canal connecting the interior of the country with the
sea.--3 illustrations.

The Iron Gates of the Danube.--An important engineering work,
opening a channel in the Danube.--1 illustration.

The New German Ship Canal.--Connection of the Baltic with
the North Sea.--Completion of this work.--1 illustration.

Transit in London, Rapid and Otherwise.--By JAMES A. TILDEN.
--A practical review of London underground railroads and their
defects and peculiarities.

IV. ELECTRICITY.--An Electrostatic Safety Device.--Apparatus
for grounding a circuit of too high potential.--1 illustration.

Experiments with High Tension Alternating Currents.--Sparking
distance of arc formed by a potential difference of 20,000 volts.
--1 illustration.

Laying a Military Field Telegraph Line,--Recent field trials in
laying telegraph line in England.--3 illustrations.

Some Experiments on the Electric Discharge in Vacuum Tubes.
--By Prof. J.J. THOMSON, M.A., F.R.S.--Interesting experimen