About to Make an Exposure Through One of the Revolving Disks. Revolving Disks Used to Intercept the Light. BY DR. ALFRED GRADENWITZ. the Photo-sculpture Process. surmountable have been overcome by Portrait Produced in Bas-Relief by manner with a practically perfect A Circle of Mirrors Focuses a Strong Light Upon the Subject Which is t be Reproduced., scientific american, 1908-01-25
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