A Periscope for Viewing and Photographing Radioactive Objects Underwater Page: 5 of 12
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1. All parts were either fabricated from standard materials or
were purchased as "off the shelf" items. The total cost,
including installation in the basi and testing ready for
use, was less than $6000.00.
2. Dismantling and mounting in a new location can be accomplished
without special handling procedures or equipment, and without
danger of damage to the delicate p rts of the optical system.
3. All precision optical components a e at the top of the instru-
ment where they are not susceptible to damage by water or
4. Those optical components which are underwater are inexpensive,
and can be replaced by personnel w th average mechanical skill.
5. The optical system functions satisfactorily under normal
atmospheric conditions without need for pressurizing the body
of the instrument with dry gas.
6. At the normal subject-to-eyepiece distance of about twenty
feet, the depth of field is about one inch for all magnifi-
The periscope, installed as shown in figures 2 through 4, is
rigidly mounted to eliminate vibration. Photographic exposures of five
to ten seconds produce clear, sharply defined images on either negative
or Polaroid type photographic materials that have an emulsion speed
rating of ASA 200.
The periscope is mounted in a recess in the wall of the Inspection
Basin in the SRL Room, as shown schematically in Figure 1. It is
constructed of an aluminum view tube four inches in diameter and four-
teen feet long, to the lower end of which a short length of tubing six
inches in diameter is welded at a right angle. The back end of the
short tube is sealed with a flat metal disk, and the front end is closed
by a cell that carries an optically-flat glass window four inches in
diameter. 0-rings around the cell flange land the glass window seal the
tube against the entry of water. The view tube is supported in a
vertical position, with its top end above water, by a carriage assembly
that rides on tracks attached to the basin wall. Two rings welded to
the view tube engage semicircular slots in the top and bottom carriage
plates to carry the weight of the tube, while leaving it free to be
rotated around its vertical axis. The carriage and view tube may be
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Locke, F. C. A Periscope for Viewing and Photographing Radioactive Objects Underwater, report, November 1, 1964; United States. (digital.library.unt.edu/ark:/67531/metadc1030032/m1/5/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.