This is the second articulator for which Matthew Kerr received a patent, the first being in 1902 . Its features include a posterior vertical stop pin, a hinge and pin mechanism with short condylar slots for lateral movement, and dual springs for holding centric position. The lower member is adjustable in an A-P direction. This articulator was featured in "The Ney Technician", by George L. Roth. This was a series of six monographs published by The J.M. Ney Company (1924-1926).
Dr. Edgar N. Starcke's articles in the Journal of Prosthodontics have more information on the history of articulators.