Here is some hard evidence - Payne, Ohio. September 3, 1925 - leased building - October 1st- equipment and supplies were arriving.
November 12, 1925 - furnaces turned on.......
Lots of experimenting....
From February 18, 1926:
"The first agates...turned out last week. The agates were fine, of various colors... Several changes were decided upon....correcting..troubles in the color blending tank will be made by Amsler & Morton, glass engineers from Pittsburgh."
This article refers to a fully automated process of color mixing and machine feeding...they had some issues to work out.......fast forward to the next year:
From March 31, 1927:
"H.M. Jenkins, the local manager, has installed new equipment.....large two-pot melting furnace...two working tanks out of which the molten glass is gathered with the use of a long bar or punny(sp) and dropped into the automatic rolling machines......the agate is finally dropped from pocket into a tank where it undergoes...tempering. There are two rolling machines, both invented by Mr. Jenkins, and are the only ones of this kind in existence....the larger one has a capacity of 43 per minute, the other about 16."
It seems they ditched the automated process and reverted to the tried and true method of hand gathering.
June 9, 1927: "Payne will lose marble factory"