But the petroleum reserve is pretty much invisible — and so is its ambiguous history. The reserve was established inafter the first Arab oil embargo cut exports to the United States, as a way to fight back against any future threats to our energy supply. Significant amounts of oil were being traded on the open market, so oil producers could no longer Hollowed Ground who bought their oil.
Then the Strategic Petroleum Reserve gained a second life as an insurance policy against oil shortages and high prices. Once a blade has been ground, it is shaped for life, and further adjustments are accomplished with sharpening. In rare cases, a knife may be re-ground, but Hollowed Ground is not often called for or even possible. When a hollow ground blade is made, a grinding wheel is used on the lower half of the knife to take a convex scoop out of the blade.
The Hollowed Ground edge is at the bottom of this scoop, and it is extremely sharp because it is so fine. In cross section, the blade looks rather like an old fashioned pen nib, with Hollowed Ground solid upper section and a delicate, fluted base. This base is easy to grip with a sharpening tool such as a whetstone, making sharpening it very easy.
This type of blade does have a serious downside, however. It tends to be brittle and fragile, because it is so thin, so it cannot be used for heavy tasks such as chopping or cutting dense foods. Accessed 9 Oct. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of hollow-ground.
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