Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 726
ions are made up of twoor more materials, which, when they are made toharmonize, or become chummy, produce somethingthat is valuable to us. Take, for instance, photography, an invention whichall of us know more or less about. Suppose you takea photograph of a lake. The image of the lake is madeon… … •l!El-nU|.: rilH ,MIKi;nK. BV HENRVALLMAN, AGE 16. (GOLD BADGE.SILVER BADGE MLH., igij ) chums lo help them to produce the lake scene. Todevelop the picture you take just so many crystals ofpyro and a certain amount of sulphite of soda andcarbonate of soda and put them all into a beaker ofwater.…
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