細節
A mahogany Geissler tube demonstrator
by M.W.Dunscombe, Bristol with winding handle -- 10½in.(26.5cm.)wide; and a trumpet and ball Geissler tube -- 8in.(20cm.)long (2)
by M.W.Dunscombe, Bristol with winding handle -- 10½in.(26.5cm.)wide; and a trumpet and ball Geissler tube -- 8in.(20cm.)long (2)