Nature Notes From Crater Lake
Volume 13, October 1947
Visibility Disc Replaced
By O. L. Wallis, Ranger-Naturalist
The white cement disk has been replaced in 25 feet of water in the
lake below the Sinnott Memorial to aid the visitors to appreciate and
grasp the extreme clarity and deep blue color of the water. One of the
binoculars at Sinnott Memorial is trained upon the 24 inch object. Paul
Herron, boatman for the Park Company, lifted the disc from its old
location, repainted it, and then reinstalled it. Metal legs were
attached to one edge so that the disc tilts toward the observation
center.
