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2016年03月30日

バランスがふと気になって突貫工事的にリードテープを貼りました。

グリップの上に錘、その上に両面テープとグリップでサンドイッチ。

名付けてダミーグリップ・・・？数度プレーして早速ダミーが歪んじゃってるけど突貫工事の割に踏ん張ってくれてます。

重いラケット振るパワーもスタミナも怪しいこの頃ですが、振り抜きが少しは改善されて良いボールいきやすくなった感があります。

良いボール打ててもその前に良いボールを打ち返せない、そんな事を改めて痛感するこの頃のテニスですけれどね。

カテゴリー: 未分類 | 投稿者クレー 23:07 | 6,559件のコメント

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Understanding COSC Certification and Its Importance in Horology
COSC Certification and its Stringent Criteria
Controle Officiel Suisse des Chronometres, or the Official Swiss Chronometer Testing Agency, is the official Swiss testing agency that verifies the precision and accuracy of timepieces. COSC accreditation is a symbol of quality craftsmanship and trustworthiness in chronometry. Not all watch brands seek COSC validation, such as Hublot, which instead follows to its proprietary demanding standards with movements like the UNICO calibre, reaching equivalent accuracy.

The Art of Exact Timekeeping
The core system of a mechanized timepiece involves the spring, which supplies energy as it unwinds. This mechanism, however, can be vulnerable to external elements that may affect its precision. COSC-validated movements undergo rigorous testing—over 15 days in various conditions (five positions, three temperatures)—to ensure their resilience and dependability. The tests measure:

Average daily rate accuracy between -4 and +6 seconds.
Mean variation, peak variation rates, and effects of thermal variations.
Why COSC Validation Matters
For timepiece fans and connoisseurs, a COSC-certified timepiece isn’t just a piece of technology but a demonstration to enduring excellence and precision. It signifies a timepiece that:

Provides exceptional reliability and precision.
Ensures confidence of superiority across the complete construction of the watch.
Is probable to retain its worth more effectively, making it a smart choice.
Well-known Timepiece Brands
Several well-known brands prioritize COSC validation for their timepieces, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, offers collections like the Record and Soul, which showcase COSC-certified movements equipped with innovative materials like silicon equilibrium suspensions to boost resilience and efficiency.

Historical Background and the Evolution of Timepieces
The idea of the chronometer dates back to the requirement for exact chronometry for navigational at sea, highlighted by John Harrison’s work in the eighteenth century. Since the formal foundation of COSC in 1973, the validation has become a standard for evaluating the accuracy of high-end watches, continuing a legacy of excellence in horology.

Conclusion
Owning a COSC-certified timepiece is more than an visual choice; it’s a dedication to excellence and accuracy. For those valuing accuracy above all, the COSC validation offers tranquility of thoughts, ensuring that each accredited timepiece will perform reliably under various circumstances. Whether for individual satisfaction or as an investment decision, COSC-certified watches stand out in the world of horology, maintaining on a tradition of precise timekeeping.

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