 ... coating of bitumen, and exposed to the full rays of the sun for a period longer or shorter according to the intensity of the light, and a faint impression on the bitumen is thus obtained. 3. The stone is now placed in a bath of sulphuric ether, which...  The Mechanics' Magazine - Seite 2981855Vollansicht - Über dieses Buch
 | British Association for the Advancement of Science - 1856
...stone is now placed in a bath of sulphuric aether, which almost instantaneously dissolves the bitumen, which has not been acted upon by light, leaving a delicate picture on the clone, composed of bitumen on which the light has fallen. 4. The stone, after being carefully washed,... | |
 | British Association for the Advancement of Science - 1856
...stone is now placed in a bath of sulphuric œther, which almost instantaneously dissolves the bitumen, which has not been acted upon by light, leaving a delicate picture on the itone, composed of bitumen on which the light has fallen. 4. The stone, after being carefully washed,... | |
 | 1866
...stone is now placed in a bath of sulphuric ether, which almost instantaneously dissolves the bitumen, which has not been acted upon by light, leaving a...with gum and acid, after which, proofs may be thrown off by the usual process. Prof. Ramsey then proceeded to state that the above process, modified, had... | |
 | 1855
...stone is now placed in a bath of. sulphuric ether, which almost instantaneously dissolves the bitumen, -which has not been acted upon by light, leaving a...ordinary manner with gum and acid, after which proofs maybe thrown off by the usual process. — Prof. Ramsey then proceeded to state that the above process,... | |
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