. Bulletin - United States National Museum. Science. CRIBB/^Cs:MASO/V/^ y CHAMBER llijB!iKii;.!aiiib!';:ji;ijiftii:aa} .[.anii-'ji \n. iMiiiiaJ I ] Cff/BB//VC Figure 3.—Plan of the Bear Trap Locks. To fill the locks: close wickets at B; open wickets at .-1; Avater passes thirough sluices E and .-1 into water chamber, then through sluice C underneath gates; gates elevated; water collects back of gates and forms pool upstream. To empty the locks: close wickets at A; open wickets at B; water passes from water chamber and under gates through sluices B and D; gates lowered; water passes over lowere
. Bulletin - United States National Museum. Science. CRIBB/^Cs:MASO/V/^ y CHAMBER llijB!iKii;.!aiiib!';:ji;ijiftii:aa} .[.anii-'ji \n. iMiiiiaJ I ] Cff/BB//VC Figure 3.—Plan of the Bear Trap Locks. To fill the locks: close wickets at B; open wickets at .-1; Avater passes thirough sluices E and .-1 into water chamber, then through sluice C underneath gates; gates elevated; water collects back of gates and forms pool upstream. To empty the locks: close wickets at A; open wickets at B; water passes from water chamber and under gates through sluices B and D; gates lowered; water passes over lowered gates carrying the boat downstream. Chute length-gate to downstream end: 68 feet. Chute length-gate to upstream end: 38 feet. Chute width: 17 feet. Gates length: 27 feet. Water chamber length: 33 feet. Water chamber width: 10 feet. (Richard Richardson, Msmo/V (a/i White, 1873. pp. 128-129.) to accommodate a railroad; the rails could be placed when business would warrant this additional expense. This wagon road was the first in the Commonwealth ever laid out using surveying instruments and em- ployed the principle of spreading out the difference in elevation from the beginning to the end over the entire distance as evenly as the topography would permit. A drou,ght occurred late in 1818 and the water level of the Lehigh River fell 12 inches below what, up to that time, had been considered the lowest water level. This required the storage of make-up water by con- structing additional dams near Mauch Chunk. Josiah White introduced a lock and dam with sluice gates to provide an adequate water level for the passage of the canalboats as required. The workmen on the naviga- tion called the locks the "Bear Trap," to elude the curi- osity of persons who were inquiring about the purpose of their construction efforts. Twelve of these locks and dams were installed during 1818 and all proved to be workable. Josiah White obtained a patent for the de- sign of the locks on O
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
