By Raphael Meldola
In contrast to another reproductions of vintage texts (1) we've not used OCR(Optical personality Recognition), as this ends up in undesirable caliber books with brought typos. (2) In books the place there are pictures similar to pics, maps, sketches and so forth we've got endeavoured to maintain the standard of those photographs, so that they characterize properly the unique artefact. even though sometimes there's yes imperfections with those outdated texts, we consider they should be made to be had for destiny generations to get pleasure from.
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Extra so than any of the opposite significant teams of components within the periodic desk, the transition metals have formed human historical past and feature been the workhorses of undefined. the invention of metal copper ended the Stone Age and ushered within the Bronze Age. Alloys of iron (especially metal) later took over, and the Iron Age changed the Bronze Age.
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Case how much and how much may of the effect is due to physical That to chemical change. light induce purely physical change will be evident on reference to the numerous recorded instances, a few of which It light is well may known be here mentioned. under the influence of that such elements as sulphur and phosphorus gradually become transformed into their so-called " " allotropic modifications, ordinary phosphorus becoming red or amorphous and a strong solution of sulphur in carbon disulphide slowly depositing the insoluble modification when exposed light in a sealed tube [A].
CHROMIUM COMPOUNDS. salts, 23 containing an excess of acid oxide, and has been shown that the it step in their photo- first reduction in the presence of an organic substance is in many instances, if not generally, the chromate, Cr 2 O 3 is , CrO 3 Cr3 O 6 which compound , capable of further reduction 4 Cr 3 The is or 6 = 6Cr 2 action of light chromium : + 3 O2 3 . upon chromatized gelatine the foundation of several important printing pro- cesses. By this action not reduced, but the gelatine rendered insoluble.
Reasoning known as exclusion By it that process of has therefore been assumed that the other alternative holds good that the darkening is due to the formation of sub- chloride. What has modern chemistry to respect to the existence of the subchloride an d priori point of view stated, the we with say ? From have, as already analogy suggested by the relationship of silver to copper and metals form subchlorides.
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