Dej log yog tseem siv tau zoo rau xyoo pua 20th tab sis lawv tsis siv lawm. Kev siv suav nrog milling hmoov hauv gristmills, sib tsoo ntoo rau hauv cov ntaub so ntswg rau papermaking, hammering wrought hlau, machining, ore crushing thiab pounding fiber ntau rau kev tsim cov ntaub.
Pob zeb zeb tseem siv niaj hnub no?
Kev siv niaj hnub
dej zeb tseem siv rau kev ua qoob loo thoob plaws ntiaj teb tsim. … Txawm hais tias muaj hluav taws xob pheej yig nyob rau thaum ntxov xyoo pua 20th ua rau cov dej zeb tsis siv lawm, qee lub tshuab dej keeb kwm tseem ua haujlwm hauv Tebchaws Meskas.
lub log dej siv qhov twg?
Kev siv dej ntau tshaj plaws yog mill hmoov hauv gristmills, tab sis lwm yam kev siv suav nrog kev tsim khoom thiab kev ua haujlwm, thiab pounding linen siv hauv ntawv. Lub log dej muaj lub log ntoo lossis hlau loj, nrog rau ntau cov hniav lossis cov thoob ntim rau ntawm ntug sab nraud uas ua rau qhov chaw tsav tsheb.
Dab tsi hloov lub log dej hauv lub tshuab?
Nyob hauv lub tebchaws no, hauv New England thiab Massachusetts, cov mills loj heev tau tsim los ntawm cov kwj dej, uas tau siv los ntawm cov log dej ntau, ntxiv los hloov los ntawm hydraulic turbines.
lub log dej zoo li cas?
Lub log dej yog cov nqi siv hluav taws xob hloov pauv, tshwj xeeb tshaj yog nyob rau thaj chaw deb nroog. Lub log dej yog lub taub hau qis hydropowercov cav tov nrog 85% kev ua haujlwm siab tshaj plaws.
How do Waterwheels Work?
