Here are the references for the drawings:
Production Drawing for an Edison “Diamond Point” Stylus. “Diamond &
Setting Assembly, Complete.” (From EPW Drawing Number 14252; dated October
25, 1916.) Thomas Edison National Historical Park archives.
Diagram of “Diamond Point” Stylus Tip, Contacting Diamond Disc Record
Groove; Front View. Showing the record surface sectioned across the
groove. From a sketch dated June 28, 1917, approved by John P. Constable
(Chief Engineer of the Edison Laboratory). Thomas Edison National
Historical Park archives.