The illuminant is oil gas, with an occulting characteristic.
And Grantline had recognized the Planetara, and had released his occulting screens surrounding the radium ore.
Perhaps a dark ring of absorptive or occulting matter encircles the nebula in nearly the same plane with the luminous whorls.
In the old days we used to depend on occulting lights, but now, flashing lights are much more powerful.
An occulting light means that some of the time the light is shut off, and at others it isn't.
This has a group of occulting lights showing white to seaward and red towards land.
Verde inclined guide-light changes from 1st proximo to triple flash—green white green—in place of occulting red as heretofore.
And Grantline had recognized the Planetara, and had released his occulting screens surrounding the ore.
Shafts of brighter light swept across and across the water from occulting beacons set at long intervals among buoys.
These lights are also fitted with occulting screens on the Lindberg system.