divided into 360 deg., it is obvious that in one hour 15 deg. must pass beneath
the sun or a star; 30 deg. in two hours, and so on. The longitude of
Kassassin is, roughly speaking, 32 deg. east, so that when the sun is due
south there, or it is noon, the earth must go on turning for two hours
and eight minutes before Greenwich comes under the sun, or it is noon
there, which is only another way of saying that at noon at Kassassin it
is 9 h. 52 m. A.M. at Greenwich. It is this purely local character
of time which gives rise to the seeming paradox of our being able to
receive news of an event before (by our clocks) it has happened at all.

* * * * *




THE ADER RELAY.


This new instrument has excited considerable interest among telegraph
and telephone men by its exceeding sensitiveness. It is so sensitive
to the passage of an electric current that a battery formed with an
ordinary pin for one electrode and a piece of zinc wire for the other,
immersed in a single drop of water, will give sufficient current
to operate the relay. In practice it has successfully worked as a
telephonic call on the Eastern Railroad Company's line between Nancy
and Paris, a distance of 212 miles, requiring but two cups of ordinary
Leclanche battery.

The instrument consists of two permanent horseshoe magnets, fixed
parallel with each other and an inch apart. A very thin spool or bobbin