Please see the page on the Snow “Acme” for all the basic information and attributes of this instrument. The improvements embodied in this model relate mainly to structural upgrades and the incisal pin and guide assembly. The upper and lower cast holders are substantially better with the pin retainers that were popular during that time. The incisal table was now adjustable which obviated the need to replace it with other ones frequently.
Dr. Edgar N. Starcke's articles in the Journal of Prosthodontics have more information on the history of articulators.