Journal of the Society of Arts, 2. kötet |
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1 - 5 találat összesen 84 találatból.
16. oldal
John Carvalho de Medeiro, of Passy, near Paris—Improvements in the means or
processes for preserving metals from corrosion. (A communication. 2047.
Thomas Bollman Upfill, and William Brown, both of Birmingham — Improvements
...
John Carvalho de Medeiro, of Passy, near Paris—Improvements in the means or
processes for preserving metals from corrosion. (A communication. 2047.
Thomas Bollman Upfill, and William Brown, both of Birmingham — Improvements
...
17. oldal
Before proceeding to discuss the more prominent means now in use, for
extracting the noble metal from the substances with which it is found assotiated, it
will be well (very briefly) to consider the conditions in which gold presents itself in
the ...
Before proceeding to discuss the more prominent means now in use, for
extracting the noble metal from the substances with which it is found assotiated, it
will be well (very briefly) to consider the conditions in which gold presents itself in
the ...
18. oldal
The precious metal occurs here in a state of minute division in quartz rock. In
Devonshire the red and brown gossans contain a per centage which will amply
repay the cost of reduction, by the best methods now known. The following
statement ...
The precious metal occurs here in a state of minute division in quartz rock. In
Devonshire the red and brown gossans contain a per centage which will amply
repay the cost of reduction, by the best methods now known. The following
statement ...
19. oldal
By Washing, is meant every process which depends for its efficacy upon the
superior I. gravity of the precious metal, as compared with the substances with
which it is mixed, in a state of such freedom as to allow it to subside from then
after ...
By Washing, is meant every process which depends for its efficacy upon the
superior I. gravity of the precious metal, as compared with the substances with
which it is mixed, in a state of such freedom as to allow it to subside from then
after ...
39. oldal
These metals are selected of different expansibilities, such as brass and steel,
the metal expanding the most being placed on the outside. The rim is divided on
each side the arm, and weights are placed on opposite portions, and as the
metals ...
These metals are selected of different expansibilities, such as brass and steel,
the metal expanding the most being placed on the outside. The rim is divided on
each side the arm, and weights are placed on opposite portions, and as the
metals ...
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