| Description | "Description of the Process of Assaying Gilt Buttons by means of Aquafortis and testing the Gold Afterwards."
"Notes on Assaying of Gilt Buttons with Aquaregia, or (by what Mr. Perkins mentioned as a new discovery of Dr. Priestley's) muriatic dephlogisticated vapour."
"Notes on refining Gilt Buttons by the Dry way, or Test, represented by Mr. Wasdell as the best and surest way of recovering all the Gold."
Memorandum by Matthew Boulton. "Assays of gilt buttons." |