Abstract: An apparatus for measuring the flow of a liquid through a conduit by observing the transit of an injected gas bubble through the conduit. A gas source, responsive to the pressure of the liquid in the conduit, supplies gas at a predetermined pressure to a gas injector. This allows the gas injectors to inject a predetermined volume of gas into the conduit, largely independent of the absolute pressure of the liquid. An image, produces a conduit image representative of the gas bubble and the liquid in the conduit, comprising a plurality of elements corresponding to a plurality of predetermined locations along the conduit. A timer responsive to the conduit image produces a plurality of transit times substantially equal to the times required for the gas bubble to transit between adjacent predetermined locations. A time analyzer and indicator are included for analyzing the plurality of transit times and indicating the flow of the liquid through the conduit.

Abstract: A multipart article comprising a rod or pin (26) with a sleeve or collar (58) on it is made from one piece of wire by parting off a blank, impact extruding a stem to form the pin or rod, backward extruding a residual portion of the blank to form the sleeve or collar with an internal diameter slightly larger than the diameter of the stem and joined to the stem by a short thin web (64), and then fracturing the web and inserting the pin or rod into the thus separated sleeve or collar.The advantage in manufacturing small articles on a mass production basis is in the economy of forming two parts in one machine operation rather than making them separately, an example being parts of a blind-riveting assembly.