<div class="description">
This circular from the U.S. Department of Commerce, National Bureau of Standards lists the attributes of selenium cells, photocells, photolytic cells, and thermopiles. The circular includes bibliographic sources for each and from which companies they can be purchased. These are light-sensitive devices used in electronics.</div>
1938<div style="display: none;">date QS:P571,+1938-00-00T00:00:00Z/9</div>
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<ul><li><a rel="nofollow" class="external text" href="https://digital.sciencehistory.org/works/h415pb445">Record in source catalog</a></li>
<li>DPLA identifier: <a rel="nofollow" class="external text" href="https://dp.la/item/5511b7d7570a4e8a14dfc0a8f73fa3b4">5511b7d7570a4e8a14dfc0a8f73fa3b4</a></li>
<li>Science History Institute identifier: padig:SHI-h415pb445</li></ul></span>