...an's expert fingers manipulated the switches and dials of theportable apparatus, and its vacuum tubes glowed into life... 
Various 「Astounding Stories, August, 1931」
...The box was made of crystal and insideit could be seen a number of vacuum tubes and coils of variousdesigns...
Various 「Astounding Stories, August, 1931」
...Evidenceof this is afforded, as well by the apertures of cells or tubes onits surface as by the fact that it yields and breaks, underpressure; and exhibits an organic structure within...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...In the tentacles are already considerablylonger and more delicate; in the vertical tubes are alreadycompleted, while Figs...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...Instead of countless tubes diverging from thedigestive cavity to the margin of the disk, as in the Zygodactyla, thereare but four...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...The Monarda or bee-balm, too,hides a sweet sip in each of its red tubes for his special benefit...
Neltje Blanchan 「Birds Every Child Should Know」
...Their stalks are not simplestems, but are hollow tubes, which in the genus Vorticellaare furnished with a muscular band, by whoseagency the movements are principally made...
Henry J. Slack 「Marvels of Pond-life」
...The result is, not toproduce anything like the tubes made by the caddis-wormsout of grains of sand, but entirely to changethe appearance of the materials employed...
Henry J. Slack 「Marvels of Pond-life」
...When these creatures diethey leave their tubes, which are often found empty inthe ponds they frequent...
Henry J. Slack 「Marvels of Pond-life」
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