Interesting stuff. I think some of the boat people came from the land. The advances in farm machinery probably resulted in less labour being required. The dam material is a good find. I read somewhere though that the whip was not for whipping the horse. It was for making a loud noise that could be heard a mile away. A signalling system to advise of the approaching boat especially when rounding a curve. The whip was specially designed and the tip probably broke the sound barrier. I forget what the whip was called. A "smack whip" ? You can see them on some Roman pictures.
A bull whip is another name they are just for making noise that an animal would move away from. You can see the key in the brick siding under the bridge where the wooden piling would slide in. The pieces are tapered to fit at the ends. The wood is thicker in the middle to withstand the pressure load at midspan the lower piece being heavier loaded. They must have used this to hold the water back at the bridge just west of the Northfield bend when they moved the canal over to clear the rail road. Remember the canal disaster. I wonder if it was this kind of thing that collapsed. Seems to me you would have to put oakum in between the pieces and wedge the whole thing down. Could be that the sides of the canal had become tapered inwards at the top. So that trimming the length of the pieces to go by the entrance of the key made them only just long enough at the bottom where the most pressure is. Just may not have been enough.
A bull whip is another name they are just for making noise that an animal would move away from. You can see the key in the brick siding under the bridge where the wooden piling would slide in. The pieces are tapered to fit at the ends. The wood is thicker in the middle to withstand the pressure load at midspan the lower piece being heavier loaded. They must have used this to hold the water back at the bridge just west of the Northfield bend when they moved the canal over to clear the rail road. Remember the canal disaster. I wonder if it was this kind of thing that collapsed. Seems to me you would have to put oakum in between the pieces and wedge the whole thing down. Could be that the sides of the canal had become tapered inwards at the top. So that trimming the length of the pieces to go by the entrance of the key made them only just long enough at the bottom where the most pressure is. Just may not have been enough.
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