Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Paildlc-Bol Boat. the whole crew ; and, in case of fire, probably notat all. The longitudinal view .shows tl\e cabins, cook-houses, etc., before and abaft tlie wheel-house, simi-larly covered in. Paddle-hole. {Hydraulic EiKjincering.) Awater-channel tlirough which tlie water passes fromthe upper pond of a canal to tlie lock-chamber, orfrom the latter to tin- low
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Paildlc-Bol Boat. the whole crew ; and, in case of fire, probably notat all. The longitudinal view .shows tl\e cabins, cook-houses, etc., before and abaft tlie wheel-house, simi-larly covered in. Paddle-hole. {Hydraulic EiKjincering.) Awater-channel tlirough which tlie water passes fromthe upper pond of a canal to tlie lock-chamber, orfrom the latter to tin- lower pond. Paddle-pro-pelIer. .V form of boat propul-sion in which the vertical blades are bolteil to aparallel bar and connected to cranks, by whose rev-Fig. Parmt-Propeaer. olution they are alternately immersed to make the ieffective stroke and raised clear of the water on the ireturn stroke. I Paddle-wrheel. A water-wheel used in the pro- ipulsion of a j The framework of a paddle-wheel consists of cen-ters, anns, and rinr/.i. The centers are disks or bosses, two or three innumber, keyed around the and havingsokets around their rims for the arms. From eaeh of the centers there radiates a set ofar)ns, equal in number to the paddles. The arnuiare straight. Hat iron bars, so placed as to moveedgeways tlirongli the water. Tlie outer ends ofthe arms are T-shaped, and to the cross-bars of each set of arms is riveted an outer rinj of rings, one or two in number to each set ofarms, aicr riveted to lugs, or projections from theedges of the anus. The luojiortions given by Hebert are to make thediameter of the wheel eipial to four times the lengthof the stroke, and the depth of each paddle J of thediameter. The
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