OCR Text |
Show Tt. l4r tl.. . ui, An aptmriitui for iueaiirlnir tho mean levrl ol tho en U nnnounood It U l4ed on tho prinolplo that lnn a U-mMwuti (ratrM a capillary tuba or u porou4 mt tlllon IU Atnpliludo dim InUliM, and it U rwturJe-l In IU phiun without tho inran Uvt of tbo wuvo tlmiiKln It timalttiof ngtix (til-tint (til-tint luwtrpnd conicJtiI.it(iiari-y . it Iblnplim with a pltii.j?r wui li I . (rvJ brneoth tho lowott Wittir It v 1 TlierOHrotwo tflU lu tlu lunt( r tho lorlnliiK fllh-d MltliMuid and opui to tho ma, tlio rt-utt betuthit ll:i oohiuiitof WAterln tho tube rUs ah J fall rry Uttlo with the till. And tl i lufKtt Mit luvcl ouii Ui rttvJ frgtu a gruated muIo. .Now ork bun. |