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Extension tubes are sometimes confused with teleconverters, an optical component (i.e., containing lenses) designed to increase effective focal length. A close-up lens also enables focusing closer for macro photography but, unlike an extension tube, a close-up lens actually is an optical element.
Drill pipe is most often considered premium class, which is 80% remaining body wall (RBW). After inspection determines that the RBW is below 80%, the pipe is considered to be Class 2 or "yellow band" pipe. Eventually the drill pipe will be graded as scrap and marked with a red band. Drill pipe is a portion of the overall drill string.
Deferred maintenance forced the Milwaukee Road to abandon its electrification in 1974. Facing bankruptcy, the Milwaukee Road abandoned its "Puget Sound extension" in 1980, eliminating much of the route of the Olympian Hiawatha. Several sections of the route are now part of the National Forest and state rails-to-trails programs including the ...
In 1905, the board approved the Pacific Extension, now estimated at $60 million ($1.58 billion in 2023 dollars). The contract for the western part of the route was awarded to Horace Chapin Henry of Seattle. The subsidiary Chicago, Milwaukee and Puget Sound Railway Company was chartered in 1905 to build from the Missouri River to Seattle and ...
The Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road) classes EP-1 and EF-1 comprised 42 boxcab electric locomotives built by the American Locomotive Company (Alco) in 1915. Electrical components were from General Electric. The locomotives were composed of two half-units semi-permanently coupled back-to-back, and numbered as ...
Rotary assemblies [2] are commonly used where formations are predictable and the rig economics are an issue. In such an assembly the weight of the drill collars gives the BHA the tendency to sag or flex to the low side of the hole, collar stiffness length and stabiliser diameter and placement are engineered as a means of controlling the flex of the BHA.
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