Improvements in the Action of the Concertina, &c. by Vibrating Springs (1844)

by Charles WheatstoneBritish Patent No. 10041 of 1844, Specification (7 August 1844) with eighteen figures. 24 pages.“Improvements in the Action of the Concertina, &c. by Vibrating Springs”. The most important of the concertina patents, establishing the characteristic features of the English concertina.Posted 15 November 2001