IV. ELECTRICITY.--Non-sparking Key.

New Instruments for Measuring Electric Currents and Electromotive

Force.--By MESSRS. K.E. CROMPTON and GISBERT

KAPP.--Paper read before the Society of Telegraph Engineers.--With

several engravings.

When Does the Electric Shock Become Fatal?

V. ART AND ARCHÆOLOGY.--Robert Cauer's Statute of Lorelei.--With

engraving.

The Pyramids of Meroe.--With engraving.

VI. ASTRONOMY AND METEOROLOGY.--The Red Sky.--Cause of

the same explained by the Department of Meteorology.

A Theory of Cometary Phenomena.

On Comets.--By FURMAN LEAMING, M.D.

Scientific American Supplement, No. 433, April 19, 1884 · 第 6 / 69 题