Chapter 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.