![]() To circulate through the space between each successive pair of optical surfaces. Or bearing collars are provided between the optical tube and the external casing at such pointsĪnd in such manner that the drying gas is forced Interior of the optical tube and between the optical tube and the external casing are in the sameĭirection, suitably placed and fitted diaphragms In cases in which the circulation of gas in the Window, then downward through the space between the optical tube or tubes and the externalĬasing. Of gas is upward through the interior of the optical tube, discharging upward against the head Tube is made practically airtight, the circulation Space between the optical tube or tubes and theĮxternal casing of the periscope. Pipe, which discharges upward, and then downward through the optical tube or tubes and the Circulation of gas is upward through this If practicable, to the extreme top of the instrument. To the lower end of a reduced tube section and, The instrument, an internal circulating pipe is led To insure the complete circulation of the drying gas throughout Part of the eyepiece box casting, and exhaustsįrom the periscope through a similarly locatedĢA2. The drying gas enters the periscope through a drying inlet plug in the lower Periscope by circulation of dry nitrogen through ![]() ![]() ![]() Suitable and adequate provision is made for drying out the interior of the ![]()
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