| 摘要 |
PURPOSE:To raise the temperature of water in a trough by a method in which rails are fixed to the left and right side walls of the trough, and a light-transmissive sheet is laid between the left and right-handed rails and detachably fixed by a keep plate. CONSTITUTION:Rails 3 and 4 of an almost U-shaped cross section are fixed to the upsides of the left and right side walls 2A of a drain ditch or trough 2 by turning their opendings 3A and 4A toward the outside, and a light-transmissive synthetic resin sheet 5 is laid between the rails 3 and 4. The left and right edges 5A and 5B of the sheet 5 are folded into the openings 3A and 4A of the rails and fixed with keep plates 6 and 7. The temperature of water flowing in the trough can thus be raised. |
