Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 461
Fig. 1049. 444 ENGINBERING DRAWINa. … ^F^^^ Fig. 1051. To retain the floAV of rivers in dry seasons when the ponding will have littleor no effect on works farther up the stream, flash-boards are used, which usually consist of an iron bolt driveninto the crest of the dam,against which common boardsare raised to be swept off whenthe…
Mechanical drawing
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