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Updated: May 13, 2025
By the use of sensitive films of gelatine bromide of silver emulsion the time required for the action of ordinary daylight in producing a photograph had been reduced to a very small fraction of a second. Muybridge utilized these films for the photographic analysis of animal motion.
You should take more exercise." Mrs Polsue eyed her severely. "When an unmarried woman gets to your time of life, she's apt to think that everything can be got over with Fruit Salts and an occasional dose of Somebody's Emulsion. Whereas it can't. I take a mile walk up the valley and back every day of my life." "I don't believe you could perspire if you tried, Mary-Martha."
In order to avoid the expense and trouble consequent on the latter process, some manufacturers add alkali, by which means the free fatty acids are saponified, and the fat is held in a state of emulsion, thus giving the cocoa a false appearance of solubility.
When hydrochloric acid is added to bichromate of potash, chromic acid is liberated. Now, chromic acid has the property of precipitating gelatine, so that what I hope to have done is to have precipitated the gelatine in this emulsion, and which will carry down the silver bromide as well.
After letting the emulsion stand for a few minutes to ripen, I pour in slowly about eight ounces of alcohol, stirring all the time, and keeping the emulsion warm; the emulsion will adhere to the stirring-rod and the bottom of the vessel in a soft mass, and all that is now required is to pour away the alcohol, allow the emulsion to cool, tear it into small pieces, wash in several changes of cold water, make up the quantity to ten ounces, and strain; it is then ready for coating.
As soon as the time set apart for that reaction has elapsed the water bath is emptied and filled with pieces of ice and iced water, and the kettle replaced in it. If the stirring apparatus be now set in motion, even this large quantity of emulsion will stiffen in at least an hour and a half.
After the emulsion is boiled in such a kettle it is allowed to stand until cool, when the ammonia is added. With such a great quantity of emulsion and so large a water bath sufficient heat is retained as to allow the action of the ammonia to take place.
It seemed apparent, therefore, that in order to obtain the desired speed there would have to be sacrificed that fineness of emulsion necessary for the securing of sharp pictures. But as was subsequently seen, this sacrifice was in time rendered unnecessary.
And then you could mark by the change of his skin and by the look out of his eyes how his courage was clabbering to whey inside him, making his face a milky, curdled white, the color of a poorly stirred emulsion, and then he quit he quit cold his hand came out again from under his coat tails and it was an empty hand and wide open.
Pasteur discovered that the virulence of the virus of rabies could be attenuated in passing it through different species of animals, and also that inoculation of this attenuated virus had a decided prophylactic effect on the disease; hence, by cutting the spinal cord of inoculated animals into fragments a few centimeters long, and drying them, an emulsion could be made containing the virus.
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