sufficient.

It always belongs to practice to judge of an invention. Mr. Von
Hefner-Alteneck tells us that two of these apparatus have been set
up--one of them a year ago in the port of Kiel, and the other more
recently at the Isle of Wangeroog in the North Sea--and that both have
behaved excellently since the very first day of their installation. We
shall add nothing to this, since it is evidently the best eulogium
that can be accorded them.--_La Lumiere Electrique._

* * * * *




DELUNE & CO.'S SYSTEM OF LAYING UNDERGROUND CABLES.


In recent times considerable attention has been paid to the subject of
laying telegraph cables underground, and various methods have been
devised. In some cases the cables have been covered with an armor of
iron, and in others they have been inclosed in cast-iron pipes. For
telephonic service they are generally inclosed in leaden tubes. What
this external envelope shall be that is to protect the wires from
injury is a question of the highest importance, since not only the
subject of protection is concerned, but also that of cost. It is
therefore interesting to note the efforts that are being made in this
line of electric industry.

[Illustration: FIG. 1. Section of the Pipe Open.]