Method of manufacturing a bulb for a cathode-ray tube, and bulb obtained by means of this method

摘要

An envelope for an oscilloscope tube is formed by simultaneously rotating and heating a glass tube and upsetting the heated tube, to form a cylindrical section having uniform thickness and varying diameter. The thus formed envelope portion is then pressed into a shape having a rectangular cross-section, without changing the circumference, in order to maintain the thickness of the envelope.