Several large steamers are
likewise being lighted on this plan. In such an application of oil gas
the management of the apparatus is very easy, and the permanence of the
illuminating power of the gas gives every facility for the lighting of
the boat, whatever be the duration of the trip.
Although Mr. Pintsch's process of manufacture has been but recently
introduced into France, it has received a number of applications that
permits us to foresee the future that is in store for it. The Railway
Company of the West has contracted for the lighting of 250 first-class
cars that run within the precincts of the city; the State Railways have
56 cars lighted in this way running between Nantes and Bordeaux and
between Saintes and Limoges; and the Line of the East has just applied
the system to 80 of its cars.
* * * * *
DELICATE TEST FOR OXYGEN.
T. W. Engelmann proposes, in the _Botanische Zeitung_, a new test, of an
extremely delicate nature, for determining the presence of very minute
quantities of oxygen, namely: its power of exciting the motility of
bacteria. If any of the smaller species, especially _Bacterium termo_,
are brought to rest, and then introduced into a fluid in which there is
the minutest trace of free oxygen, they will immediately begin to move
about freely; and if the oxygen is gradually introduced, their motion
will be set up only in those parts of the drop which the oxygen reaches.
Pages:
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163