They take out no patents for their discoveries, they make no commerce with secrets, odious things which noble minds eschew. It is to such a goodly host of fellow-soldiers in the stereographic camp that we must attribute the riches of our knowledge. The questions are answered by facts. Instantaneous stereographs exist in great number, and the artists that produced them have bequeathed to the public their modus operandi . I can not do better than quote a few instantaneous processes.
All amateurs agree in certain particulars, which conduce to success.
Instantaneous Process of Lieutenant-Colonel Stuart Mortley. The pyroxyline is first steeped in the iodo-bromized alcohol, and the ether then added. Silver Bath . Leave the plate in the bath loner than you would if the collodion contained only iodine. From this stock-developing solution take as much as is required, and add acetic acid, according to the temperature, generally in about the same quantity as the formic acid.