§ 46. Making Ground Glass. — [*]
§ 47. Glass-cutting. — [*]
§ 48. Cementing. — [*]
§ 49. Fusing Electrodes into Glass. — [*]
§ 51. The Art of making Air-tight Joints. — [*]
APPENDIX TO CHAPTER I [*]
ON THE PREPARATION OF VACUUM TUBES FOR THE PRODUCTION OF PROFESSOR ROENTGEN'S RADIATION [*]
CHAPTER II [*]
GLASS-GRINDING AND OPTICIANS' WORK [*]
§ 61. Details of the Process of Fine Grinding. — [*]