今日のモールス電文・・・蚊取り線香

今日のモールス電文・・・蚊取り線香
mosquito coils are incense sticks that have been
mixed with ingredients with an insecticidal effect.
when they were first developed in japan
at the end of the nineteenth century they were stick-shaped,
but they were later refined into spiral coils.
蚊取り線香は殺虫効果がある成分を練り込んだ線香です。
日本では１９世紀の終わりに開発された時は棒状でしたが、
後に渦巻き型に改良されました。