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 experiments
described and illustrated.--4 illustrations.
The Electrical Manufacture of Phosphorus.--Note upon a new
English works for this industry.
V. GEOGRAPHY.--The Mississippi River.--By JACQUES W. REDWAY.
--An interesting paper on the great river and its work and
history.
VI. MECHANICAL ENGINEERING.--How to Find the Crack.--
Note on a point in foundry work.
Riveted Joints in Boiler Shells.--By WILLIAM BARNET LE
VAN.--Continuation of this practical and important paper.
--10 illustrations.
VII.
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