Macalaster & Wiggin “Transformer” Tube
21” (53cms) long. 7” (17,5cms) bulb. Dating to the mid or late second decade, or early
twenties of last century, this tube was built by the Macalaster and Wiggin
Company, Chicago, under a “Queen” patent No. 594036 (1898-1899) and
intended for use with a high tension transformer. The Tungsten target is embedded in a heavy copper
anti-cathode. The ring type attachment to the anti-cathode is inspired from an old tube
design “The Penetrator Tube” illustrated in Practical Radiography,
1898, (A.W. Isenthal and H. Snowden Ward,
p.63, Fig.32). Ring type attachments to the anti-cathode are
equally seen in a catalog of early tubes by C.H.F.Müller (tubes No. 8, 9 and
14 in the illustration below from Medica Mundi, p.18, vol 35, 1990).
Presumably this attachment improves the efficiency of the electron beam
hitting the target. The regeneration device is compactly stuffed with
fiber-like material, probably asbestos. |
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