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Science Face Mask featuring the photograph Standard Of Mass, Avoirdupois Pound by NIST/Science Source

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The watermark at the lower right corner of the image will not appear on the final product.

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Standard Of Mass, Avoirdupois Pound Face Mask

NIST/Science Source

by NIST/Science Source

$17.00

This product is currently out of stock.

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Product Details

The Center for Disease Control has recommended the use of cloth face masks to help fight the spread of COVID-19.

This face mask is made from 100% polyester and includes two ear loops with adjustable grommets for a comfortable fit.

The printed area of the mask is approximately 7" wide by 5" tall.   This mask fits well on adult mens' faces without the grommets but, due to the adjustable grommets, can be worn snuggly by adult women, as well.

Please note - this is NOT a surgical grade mask. It is not intended for any medical or commercial uses, whatsoever. It is a simple, cloth mask designed for everyday use to cover your mouth when out in public. The mask should not be used in any medical or surgical setting.

We make no warranties that the mask prevents infections or the transmission of viruses or diseases.

Design Details

This gold-plated brass standard of mass in cylindrical form has a circumferential groove instead of a knob to facilitate its handling. In 1834 the... more

Ships Within

2 - 3 Business Days

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Face Mask Tags

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Photograph Tags

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Artist's Description

This gold-plated brass standard of mass in cylindrical form has a circumferential groove instead of a knob to facilitate its handling. In 1834 the Imperial Troy Pound of 1758 was destroyed by fire. Using two platinum troy pounds which had been carefully compared with the lost standard, Professor W.H. Miller of the British Standards Commission constructed a new platinum troy pound and from that a new platinum imperial avoirdupois pound. As a part of this work, gilded bronze copies were distributed to English-speaking nations, and copy No. 5 was received in 1856 as a gift from Great Britain to the United States. It was reported that Ferdinand R. Hassler's star pound agreed with this copy within 0.001 grain, or 1 part in 7 x 106, a truly remarkable achievement. Comparisons between the two platinum weights and the Kilogram of the Archives have provided the basis for the currently accepted relation 1 avoirdupois pound = 0.45359237 kilogram.

 

$17.00