轮尺
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(轮(lún )尺(chǐ ),轮(lún )尺(chǐ ))
用(yòng )以(yǐ )直(zhí )接(jiē )量(liàng )测(cè )树(shù )木(mù )直(zhí )径(jìng )的(de )工(gōng )具(jù )。一(yī )般(bān )为(wéi )木(mù )製(zhì )。由(yóu )一(yī )个(gè )有(yǒu )刻(kè )度(dù )的(de )木(mù )尺(chǐ )和(hé )两(liǎng )个(gè )垂(chuí )直(zhí )于(yú )木(mù )尺(chǐ )的(de )脚(jiǎo )组(zǔ )成(chéng )。一(yī )个(gè )脚(jiǎo )固(gù )定(dìng )在(zài )木(mù )尺(chǐ )零(líng )点(diǎn )处(chù ),称(chēng )“固(gù )定(dìng )脚(jiǎo )”;另(lìng )一(yī )脚(jiǎo )套(tào )在(zài )木(mù )尺(chǐ )外(wài )面(miàn )而(ér )可(kě )以(yǐ )左(zuǒ )右(yòu )滑(huá )动(dòng ),称(chēng )“游(yóu )动(dòng )脚(jiǎo )”。用(yòng )两(liǎng )脚(jiǎo )夹(jiá )住(zhù )树(shù )干(gàn ),就(jiù )可(kě )以(yǐ )从(cóng )木(mù )尺(chǐ )上(shàng )读(dú )出(chū )直(zhí )径(jìng )。游(yóu )动(dòng )脚(jiǎo )裡(lǐ )常(cháng )装(zhuāng )有(yǒu )小(xiǎo )轮(lún )以(yǐ )减(jiǎn )少(shǎo )同(tóng )木(mù )尺(chǐ )间(jiān )的(de )摩(mó )擦(cā )。
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