A collection of articles mostly written by Paul M. Chamberlain and contained loose within a brown folder, some contained within an envelope addressed to Ilbert from Chamberlain.
From a twoAmerican publications including The Jewellers' Circular and The National Jeweller.
Development of the Escapement
Some Notes on the History of Balance Springs (two copies)
An Arnold Pocket Chronometer
Making Better Watchmakers for America
American Horologists to be Honoured at Coming Convention of Horological Institute of America