| 摘要 |
<p>A field standard test weight having a density of between 7 and 9 grams per cubic centimeter and including a steel shell forming a durable enclosure, with the shell being filled with a mixture of lead slag, metallic lead, and lead oxide to achieve the overall density required, with various configurations being made possible because of the overall design characteristics. The test weight may also be provided with a weight adjusting cavity for receiving a charge of metallic lead therewithin in order to achieve the tolerances required for field standard test weights.</p> |
