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English: Figure 20. The Halladay geared windmill was in more extensive use for railway water stations than any other mill. Relative scale is shown by comparison with locomotive and worker tending water spout.
Dagsetning
Uppruni "The Wind Mill as a Prime Mover," by Alfred R. Wolff, p. 93. 1885. Library Call Number M/1360 W855. http://www.photolib.noaa.gov/htmls/libr0499.htm
Höfundarréttarhafi Alfred R. Wolff

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núverandi20. mars 2008 kl. 16:41Smámynd útgáfunnar frá 20. mars 2008, kl. 16:41700 × 1.078 (319 KB)Quatro Valvole{{Information |Description=Figure 20. The Halladay geared windmill was in more extensive use for railway water stations than any other mill. Relative scale is shown by comparison with locomotive and worker tending water spout. In: "The Wind Mill as a Prim

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