11月19日(土) 天候:晴時々くもり 参加者:39名 確認種数:36種
久しぶりの定員なしでの開催。初めての方や一般の方も多かったので、初めての方中心のグループと常連さんのグループに分かれた。
コースも山のエリアを右回り・左回りと変えて観察した。
大池ではヨシガモのエクリプスや早くも到来したユリカモメが目を引く中、コガモの羽色の変化を観察。アメリカヒドリの鳴き声の特徴も確認できた。
カワセミやジョウビタキ、モズなど定番の鳥達にも恵まれ満足のいく鳥見となった。
写真撮影 杉本、山岡
11月19日(土) 天候:晴時々くもり 参加者:39名 確認種数:36種
久しぶりの定員なしでの開催。初めての方や一般の方も多かったので、初めての方中心のグループと常連さんのグループに分かれた。
コースも山のエリアを右回り・左回りと変えて観察した。
大池ではヨシガモのエクリプスや早くも到来したユリカモメが目を引く中、コガモの羽色の変化を観察。アメリカヒドリの鳴き声の特徴も確認できた。
カワセミやジョウビタキ、モズなど定番の鳥達にも恵まれ満足のいく鳥見となった。
写真撮影 杉本、山岡
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Understanding COSC Validation and Its Importance in Watchmaking
COSC Accreditation and its Demanding Criteria
COSC, or the Official Swiss Chronometer Testing Agency, is the authorized Switzerland testing agency that attests to the accuracy and accuracy of wristwatches. COSC certification is a symbol of superior craftsmanship and reliability in timekeeping. Not all timepiece brands pursue COSC accreditation, such as Hublot, which instead adheres to its proprietary demanding criteria with mechanisms like the UNICO calibre, achieving similar accuracy.
The Science of Exact Chronometry
The core system of a mechanical timepiece involves the spring, which delivers power as it unwinds. This system, however, can be susceptible to environmental elements that may affect its accuracy. COSC-certified mechanisms undergo demanding testing—over fifteen days in various conditions (five positions, 3 temperatures)—to ensure their resilience and reliability. The tests measure:
Mean daily rate precision between -4 and +6 secs.
Mean variation, peak variation rates, and effects of temperature variations.
Why COSC Certification Is Important
For timepiece fans and connoisseurs, a COSC-accredited timepiece isn’t just a piece of technology but a testament to lasting quality and precision. It signifies a timepiece that:
Offers exceptional dependability and accuracy.
Offers guarantee of quality across the complete construction of the watch.
Is likely to maintain its value better, making it a sound investment.
Well-known Chronometer Brands
Several well-known manufacturers prioritize COSC certification for their watches, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, offers collections like the Archive and Spirit, which feature COSC-accredited movements equipped with innovative substances like silicone balance springs to improve resilience and efficiency.
Historical Background and the Evolution of Timepieces
The idea of the chronometer originates back to the need for precise timekeeping for navigation at sea, emphasized by John Harrison’s work in the 18th century. Since the formal foundation of Controle Officiel Suisse des Chronometres in 1973, the accreditation has become a standard for evaluating the precision of high-end watches, maintaining a tradition of superiority in watchmaking.
Conclusion
Owning a COSC-accredited timepiece is more than an visual choice; it’s a commitment to excellence and accuracy. For those valuing precision above all, the COSC accreditation provides tranquility of mind, ensuring that each certified watch will operate reliably under various circumstances. Whether for personal contentment or as an investment, COSC-validated watches distinguish themselves in the world of watchmaking, maintaining on a legacy of precise chronometry.