The lantern is protected against wind
and waves by very thick convex glasses set into metallic cross-bars, c.
The flame is located in the focus of a Fresnel lens, b, consisting
of superposed prismatic rings, and adjusted at its lower part with a
circle, d, while a conical ring, e makes a joint at its other extremity.
This ring is held by the top piece of the lantern through the
intermedium of six spiral springs, c' c''. Under the focus of the flame
there is placed a conical reflector of German silver, t.
The buoy is filled through an aperture, k, in the side of the upper
tube. This aperture is provided with a valve which allows of the buoy
being charged by connecting it with the accumulators located on a boat
built especially for this service. As soon as the gas reaches 6 or 7
atmospheres the cocks of the buoy and reservoir are closed, and the
connecting tube is removed. The consumption of gas in the lantern
is. 1,230 cubic inches per hour. This being known it is very easy to
calculate from the capacity of the buoy how often it is necessary to
charge it.
A large number of buoys on the Pintsch system are already in use.
The oil gas is likewise applicable to the illumination of lighthouses,
and among those that are now being lighted in that way we may cite the
one in the port of Pillau, near Koenigsberg.
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