. Fig. A is a double row of coarse wire screens ; B apron of fine wire cloth ; D a screen ; F a screen. Roller Spawning Box. For takin, the naturally impregnated eggs of Brook Trout, Salmon, etc. {Patent of A. S. Collins.) In the Roller Spawning Box the principle used is that of the Ainslrth Screens, and the improvement conststs - new and convenient method of collecting the eggs. A double row ol coa s" i- screens (three meshes to the inch), -£'«.>" â¢-^!'; each wo feet square, are put together in one frame, ^'f«' ^J â fot . These screens are to be filled with coarse g--'' -f

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. Fig. A is a double row of coarse wire screens ; B apron of fine wire cloth ; D a screen ; F a screen. Roller Spawning Box. For takin, the naturally impregnated eggs of Brook Trout, Salmon, etc. {Patent of A. S. Collins.) In the Roller Spawning Box the principle used is that of the Ainslrth Screens, and the improvement conststs - new and convenient method of collecting the eggs. A double row ol coa s" i- screens (three meshes to the inch), -£'«.>" â¢-^!'; each wo feet square, are put together in one frame, ^'f«' ^J â fot . These screens are to be filled with coarse g--'' -f f^ eggs pass through as in Ainsworth's Screens. ""^ 'te e kL endless apron of fine wire-cloth, passmg over rollers at he To ends of th'box. This apron is about one i-h beneath e upper screen, and is kept fiom saggtng by small cross-bars, rorresponding to the division of the upper screen. Trercrostbars are supported by, and, when the rollers ar turned slide on, an inch-square strip naded to the s,de of the box. A imilar trip, one inch above, supports the larger screens.

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Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1873