At the top of the blowpipe, a hammer striking the alumina reservoir causes it to drop regularly onto a small rod.
At the top of the blowpipe, a hammer striking the alumina reservoir causes it to drop regularly onto a small rod.
边喷火，边用铁锤敲打铝氧粉储槽，使铝氧粉熔浆有规律地滴落在一个小棒上。