The American annual of photography . The raggedy man, he knows most tells em if I be good sometimes. NANCY FORD CONES. z8z their productions were called Heliographic Pictures/ Theirmethod of fixing the images produced in the camera was byusing metallic plates, coated with a composition of asphalt andoil of lavender. This, where acted on by the light, remainedundissolved when the plate was plunged into a mixture ofpetroleum and oil of lavender; and the development of theimage was affected by the action of acids and other chemicalre-agents on the exposed surface of a copper Fig
The American annual of photography . The raggedy man, he knows most tells em if I be good sometimes. NANCY FORD CONES. z8z their productions were called Heliographic Pictures/ Theirmethod of fixing the images produced in the camera was byusing metallic plates, coated with a composition of asphalt andoil of lavender. This, where acted on by the light, remainedundissolved when the plate was plunged into a mixture ofpetroleum and oil of lavender; and the development of theimage was affected by the action of acids and other chemicalre-agents on the exposed surface of a copper Figure 1. Daguerres process, when perfected, consisted of five opera-tions, viz.:—the polishing of the silver plate; the coating ofthe plate with iodide of silver by submitting it for abouttwenty minutes to the action of iodine vapor; tlie projectionof the image of the object upon the golden-colored iodizedsurface ; the development of the latter image by means of thevapor of mercury; and lastly the fixing of the picture byimmersing the plate in a solution of sodium exposures required from three to thirty minutes. 182
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorktennantandw
