Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Micrometer
C-shaped metal piece, one jaw of which can be adjusted by a screw, screw is turned by rotating a drum with a vernier scale marked on it from which dimensions can be read.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.