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sight glass[′sīt ‚glas]
A glass tube or a glass-faced section on a process line or vessel; used for visual reading of liquid levels or of manometer pressures.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A glass tube used to indicate the liquid level in a pipe, tank, or the like.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
i. A transparent tube on the outside of a reservoir or tank that shows the level of the fluid in the container.
ii. A small window in the high side of a vapor-cycle cooling system. The system is fully charged if there are no bubbles seen in the sight glass.
iii. The transparent glass of a gun sight or a head-up display.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved