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[Gen'l Info] 19thC Military Optics

I wonder if anyone has encountered two terms noted during the 1860s, referring to British (and American?) military telescopes, namely "cells" and "pipes." From context, "cell" may refer to the "sandwich" of lenses (for example, in the eye-piece) which can be interchanged to vary magnification. "Pipe" may be synonymous with "draw(s)," referring to the sections of the tube of the telescope, or to interchangeable eye-pieces. An example: "10 telescopes; 10 sets of lenses in cells and pipes, complete." Seeking authoritative definitions.

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