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Assembling threaded pipe is labor-intensive, and requires skill and planning to allow lengths of pipe to be screwed together in sequence. Most threaded-pipe systems require strategically located pipe-union fittings in final assembly. The threaded pipe is heavy and requires adequate attachment to support its weight.
Radiator caps for pressurized automotive cooling systems. Of the two valves, one prevents the creation of a vacuum, the other limits the pressure. It is generally a limitation of most cooling systems that the cooling fluid not be allowed to boil, as the need to handle gas in the flow greatly complicates design.
A ruff from the early 17th century: detail from The Regentesses of St Elizabeth Hospital, Haarlem, by Verspronck A ruff from the 1620s. A ruff is an item of clothing worn in Western, Central and Northern Europe, as well as Spanish America, from the mid-16th century to the mid-17th century.
Before 1767, there were no definite badges for Field Marshals and general officers.In 1767, the British Army issued an order to distinguish Field Marshals (once the rank was established in 1813) and different graded General officers by the combination of chevron-shaped ess pattern laces on the sleeve.
This is the category page for Cap badges of the British Army. Media in category "British Army Cap badges" The following 19 files are in this category, out of 19 total.
A stand (of drill pipe) is two or three joints of drill pipe connected and stood in the derrick vertically, usually while tripping pipe. A stand of collars is similar, only made up of collars and a collar head. The collar head is screwed into the collar to allow it to be picked up by the elevators.