Measuring and testing – Liquid level or depth gauge – Sight glass
Patent
1976-01-19
1977-03-29
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Sight glass
G01F 2302
Patent
active
040142140
ABSTRACT:
A liquid level gauge having a body defining a liquid receiving chamber, a transparent reflex glass at an open face of the body chamber for maintaining liquid within the chamber while providing visual access into the chamber, a removable cover plate maintaining the reflex glass in sealing engagement with the chamber body, the reflex glass including on its inner face a plurality of longitudinally extending prisms adapted to be contacted by liquid in the chamber, a background plate within the walls of the chamber, and means to space the background plate from the reflex body to permit circulation of liquid therebetween, the background plate displaying through the reflex glass a high visual contrast, e.g., a bright color, between wetted and nonwetted areas of the reflex glass. As disclosed, the reflex glass may be formed of a transparent plastic material and be arranged with a relatively thin cross section to permit its use as an insert for assembly with an outwardly disposed primary pressure-retaining glass.
REFERENCES:
patent: 470858 (1892-03-01), Klinger
patent: 500444 (1893-06-01), Vetter et al.
patent: 852781 (1907-05-01), Fisher
patent: 1240251 (1917-09-01), Pocock
patent: 1380080 (1921-05-01), Sargent
patent: 1488403 (1924-03-01), Macbeth
patent: 2071411 (1937-02-01), Lamesch
Jerguson Gaga and Valve Company
Queisser Richard C.
Roskos Joseph W.
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