. Domesticated trout [microform] : how to breed and grow them. Fish culture; Trout; Pisciculture; Truite. 32 DOMESTICATED TROUT. l-1g. I is a spawning box, v^•ith a portion of the side "i-i3a^^-^~ 1< U,. ^ is a double row of coarse wire screens : B apron of fine wire cloth; D a screen ; F a screen. Roller Spawning Box. For taking the naturally imprconatcd eggs of Brook Trout, Salmon, etc. {Patent of A. S. Collins.) In tlie Roller Spawning Box tlie principle used is that of the Ainswor^h Screens, and the improvement consists in a new and convenient method of collecting the egg
. Domesticated trout [microform] : how to breed and grow them. Fish culture; Trout; Pisciculture; Truite. 32 DOMESTICATED TROUT. l-1g. I is a spawning box, v^•ith a portion of the side "i-i3a^^-^~ 1< U,. ^ is a double row of coarse wire screens : B apron of fine wire cloth; D a screen ; F a screen. Roller Spawning Box. For taking the naturally imprconatcd eggs of Brook Trout, Salmon, etc. {Patent of A. S. Collins.) In tlie Roller Spawning Box tlie principle used is that of the Ainswor^h Screens, and the improvement consists in a new and convenient method of collecting the eggs. A double row of coarse wire screens (three meshes to the inch), eight in number, each two feet square, are put together in one frame, eight feet by four. These screens are to be filled with coarse gravel, and the eggs pass through as in Ainsworth's Screens. Under these is an endless apron of fine wire-cloth, passing over rollers at the two ends of the box. This apron is about one inch beneath the upper screen, and is kept from sagging by small cross-bars, corresponding to the division of the upper screen. These cross-bars are supported by, and, when the rollers are turned, slide on, an inch-square strip nailed to the side of the box. A similar strip, one inch above, supports the larger Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stone, Livingston, 1836-1912. Boston : J. R. Osgood
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1872
