Roj hmab erasers tau dhau los ua ib txwm muaj nrog qhov tshwm sim ntawm vulcanization. Nyob rau Lub Peb Hlis 30, 1858, Hymen Lipman ntawm Philadelphia, Tebchaws Asmeskas, tau txais thawj patent rau kev txuas cov lwv mus rau qhov kawg ntawm tus cwj mem. Tom qab ntawd nws tau ua tsis raug cai vim nws tau txiav txim siab los ua ib qho kev sib xyaw ntawm ob lub cuab yeej es tsis yog cov khoom tshiab nkaus xwb.
Thaum twg tau kneaded erasers invented?
In 1839, tus tsim khoom Charles Goodyear daws cov teeb meem no los ntawm kev tsim ib txoj hauv kev kho cov roj hmab hu ua vulcanization. Cov txheej txheem no ua rau cov roj hmab ruaj khov thiab tso cai rau cov kua nplaum los ua ib yam khoom hauv tsev. Nws tseem yog ib puag ncig lub sijhawm uas cov khoom siv kneaded eraser tau tsim.
Leej twg invented tus cwj mem nrog txuas lo lo ntxhuav?
Thiab tam sim no ib nplooj ntawv los ntawm peb "Sunday Morning" Almanac: Lub Peb Hlis 30, 1858, 156 xyoo dhau los hnub no… hnub uas Philadelphia inventor ua nws lub cim. Rau qhov ntawd yog hnub Hyman Lipman patented thawj tus cwj mem nrog nws tus kheej lwv…a sawb ntawm roj hmab embedded nyob rau hauv lub kawg uas yuav tsum tau sharpened ib yam li cov graphite point.
National Rubber Eraser Day yog dab tsi?
Ib xyoos saib ntawm Plaub Hlis 15 yog National Rubber Eraser Day. Hnub no ua kev zoo siab, lees paub thiab txaus siab rau qhov kev tsim ntawm erasers. Cov ntsiav tshuaj ntawm cov roj hmab (los yog siv quav ciab) tau siv los tshem tawm cov hlau lead lossis charcoal cim los ntawm daim ntawv ua ntej muaj cov roj hmab rub tawm. Lwm qhov kev xaiv rau lub lwv yog lub khob cij tsis muaj crustless.
Lub luag haujlwm ntawm Sir Arthur Dremel ntawm kev sib tw hauv keeb kwm ntawm cov lwv yog dab tsi?
In 1932, Arthur Dremel invented the electric eraser. Lub taub hau lwv tau daig ntawm qhov kawg ntawm lub cev muaj zog, uas tig lub lwv kom cov ntawv siv tsis muaj kev puas tsuaj.
