Ƙamus · kayan aiki
Ƙwallo
Ƙaramin ƙwallon da ake jefawa a hanyarsa a akasin juyawar rotor. Ƙwallayen zamani na ivorine ko Teflon ne, 18–21 mm.
A cikin mahallin amfani
Girman ƙwallo yana canza yadda yake tsalle: ƙaramin ƙwallo yana daɗewa yana karkaɗawa tsakanin fretskayan aikiFretRabe-raben ƙarfe da ke tsakanin ramuka biyu a kan dabaran.Karanta gaba ɗaya → kafin ya zauna. Ɗakunan watsa shirye-shirye suna canza girma don su sauya yanayinsa.
Ko kun sani
An yi amfani da ƙwallayen hauren giwa har zuwa tsakiyar ƙarni na 20; masu tara kayan tarihi har yanzu suna kiran na roba “ivorine”, sunan kasuwanci na wani madadin celluloid daga shekarun 1890.