Pressed glass knobs play a special role in glass history. They were among the earliest machine-pressed objects, and subject of a U.S. patent as early as 1825.
|A Glance at Glass Knobs
Letitia Hart Alexander.
The Magazine Antiques, May 1928, pp. 393-394.
|An early study of glass knobs.|
| The Case of the Pressed Glass Knobs
The Magazine Antiques, August 1951, pp. 118-120.
|An account of the 1829 legal complaint by Whitney and Robinson of the New England Glass Company against the Union Glass Company of Philadelphia.|
| The role of Glass Knobs in Glassmaking and Furniture
Kenneth M Wilson and Kirk J Nelson.
The Magazine Antiques, May 1996, pp. 750-759.
|An up-to-date survey of the subject.|