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The nominal internal diameter of a pipe. In contrast, the outside diameter is specified for brass and copper tubing and for brass and copper pipe of other than iron-pipe sizes.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
"All the calibres that are used in crewed turrets can also be integrated into remote systems," he said.
There has been a range of changes in recent years, depending on calibre size and vehicle role.
A clear trend over the past decade has been a heightened appetite for Programmable Airburst Munitions (PABM) in medium calibre weapons.
Definitions differ, but medium calibre weapons typically fall into the 12.7mm to 40mm category.
The .40 S&W is a new calibre that has been widely adopted by police forces.