私が勤めている会社は特殊な計測器の専門商社で、私は計測には無縁の素人なので、滅多に読むことはありませんが、会社で購読している専門誌の 'Metrologist NCSLI Worldwide News'（季刊誌）を見かることがあります。仕事が一段落して暇だったので最新号をパラパラと見ていたら 'Magnets Attract Young Minds' と云う記事に "I learned the earth is a magnet and I learned about a cow magnet." と書かれた見出しを目にしました。"cow magnet" とはどんな磁石か興味をもち記事を読みましたが、記事内には "cow magnet" の話はありませんでした。そこでGoogleで "cow magnet" を検索したら次の様な記事が幾つもありました。
Cow magnets are popular with dairy farmers and veterinarians to help prevent Hardware Disease in cattle. While grazing, cows eat everything from grass and dirt to nails, staples and bits of bailing wire (referred to as tramp iron). Tramp iron tends to lodge in the honeycombed walls of the reticulum, threatening the surrounding vital organs and causing irritation and inflammation, known as Hardware Disease. The cow loses her appetite and decreases milk output (dairy cows), or her ability to gain weight (feeder stock). Cow magnets help prevent this disease by attracting stray metal from the folds and crevices of the rumen and reticulum. One magnet works for the life of the cow!
米国の農場にはそんなに釘やら針金が落ちているのでしょうか？ "cow magnet" の広告も多くありましたのでそうなのでしょうね。
Cow magnets are popular with dairy farmers and veterinarians to help prevent Hardware Disease in cattle. While grazing, cows eat everything from grass and dirt to nails, staples and bits of bailing wire (referred to as tramp iron). Tramp iron tends to lodge in the honeycombed walls of the reticulum, threatening the surrounding vital organs and causing irritation and inflammation, known as Hardware Disease. The cow loses her appetite and decreases milk output (dairy cows), or her ability to gain weight (feeder stock). Cow magnets help prevent this disease by attracting stray metal from the folds and crevices of the rumen and reticulum. One magnet works for the life of the cow!
米国の農場にはそんなに釘やら針金が落ちているのでしょうか？ "cow magnet" の広告も多くありましたのでそうなのでしょうね。
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