Giving the most approved and convenient methods for preparing the chemicals, and the combinations used in the art. Containing the daguerreotype, electrotype, and various other processes employed in taking heliographic impressions.
ent importance to the success of their pictures to accept it, the alcoholic solution being in its nature less objectionable.
I will say here, that a plate submitted to only an ordinary polish is found to contain numberless minute particles of the powder made use of. Should the same plate be buffed for a long time, the polish will nearly all disappear, leaving the cavities in the surface free for the action of agents employed in subsequent operation. For this reason, I find that great amount of polishing powder should not be applied to the last buff, and it is obvious that three buffs can be employed to adventure; the two last should not receive any polishing materials. I have examined a plate that was considered to possess a fine finish, and similar had produced good impressions; these same plates, when subjected to a long and light buffing, would present a surface no finer in appearance to the naked eye; but upon exposure to the solar radiation, would produce a well-defined image in one fourth less ti
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