The old emulsions can not only be coated on modern equipment, they can be made on modern equipment. In fact, some of this emulsions are being made and coated on the original 1920s - 40s equipment. This is being done by some of the Eastern European companies.

Many of these were Ammonia digest makes such as found in the FIAT or BIOS reports. The best book description is in Baker (2nd Edition). It is the basis for my own film / plate emulsion.