| 摘要 |
An observation window particularly suited for use in visually observing an internal portion of a casing adapted to confine therewithin a fluid medium. The window is characterized by a body having an internal chamber disposed in direct communication with the internal portions of the casing, a transparent closure of a substantially planar configuration, and a heater coil within which the body is confined, whereby gas delivered from the casing to the chamber is heated by the coil for thus establishing within the chamber a cell of unsaturated gas isolating the transparent closure from the fluid medium.
|
