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Coating over dry iodine to an orange color, then over the accelerator, to a light rose, and back over iodine one sixth as long as first coating, will produce a fine, soft tone, and is the coating generally used for most accelerators.
In America, the words "Quick" and "Quick Stuff," are more generally used for and instead of the more proper names, "Sensitives," or "Accelerators," etc. As it has by use become common, I frequently use it in this work. Liquid Accelerator, No. 1.
Both these compounds, when the vapor arising from them is not too intense, have an odor analogous to that of bleaching powder, and quite distinguishable from chlorine, bromine, or iodine alone." Farther on, I have given, in connection with accelerators, a process I adopt, which is far less tedious and equally reliable.
It is a singular fact, that the vapors of bromine and chlorine combining upon the iodide of silver, produce a more sensitive coating than when the two are combined in solution, as in chloride of bromine solution. Those having Humphrey's Journal at hand, can refer to vol. i. p. 142. To use Bromine Water or other Accelerators in Hot Weather.
This tube must connect with the bottle containing the iodine, and the yellowish-green gas disengaged will readily combine with the iodine, forming a deep red liquid, and the operation is complete. The use of chloride of iodine will be referred to in connection with the Accelerators. Iodides.
It is obtained from decomposition of fluorspar by strong sulphuric acid. It readily dissolves the silica in glass, and consequently cannot be kept in a vessel of that material. It is prepared and kept in lead. It is employed in accelerators on account of its fluorine. One small drop on the tongue of a dog causes death.
The plate upon which is this salt, is again exposed to the vapor of bromine, forming a bromo-iodide of silver, a salt also. As most of the various accelerators are compounds of bromine, with either chlorine or fluorine combination, they partake somewhat of the nature of these latter, giving results which can be detected by the experienced operator.
For manner of using, see farther on, under head of Accelerators. Bromides. A bromide treated with oil of vitriol, disengages chlorohyadic acid; but vapors of bromine are constantly disengaged, at the same time imparting a brown color to the gas. If the bromide be treated with a mixture of sulphuric acid, and peroxide of manganese, bromide is only disengaged.
Some of the glands of internal secretion act as accelerators to the sex glands. Others act as retarding antagonists. Among the most important of the latter is The thymus is the gland which dominates childhood. It appears to do so by inhibiting the activity of the testes or ovaries. Castration causes a persistent growth and retarded atrophy of the thymus.
And promptly the drivers of the two cars which had been at the heart of the snarl, like key logs in a jam, both heckled, both in the wrong and filled with unsaid things, trod harshly upon their accelerators. Wire-wheeled sedan and lemon-tinted limousine, up-town bound and cross-town bound, they leaped simultaneously forward, as Felicity stepped between.
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