The Popular Science Review: A Quarterly Miscellany of Entertaining and Instructive Articles on Scientific Subjects, Volume 2James Samuelson, Henry Lawson, William Sweetland Dallas Robert Hardwicke, 1863 |
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Página 37
... silver electro - plating in the early period of its development . In the year 1838 , Messrs . G. R. & H. Elkington were engaged , commercially , in coating military and other metal ornaments with gold and silver , by immersing them in ...
... silver electro - plating in the early period of its development . In the year 1838 , Messrs . G. R. & H. Elkington were engaged , commercially , in coating military and other metal ornaments with gold and silver , by immersing them in ...
Página 38
... silver , and copper , it says , that " if after these calces " ( i . e . , the cyanides or ferrocyanides of gold and silver ) " have been precipitated , a sufficient quantity of precipitating liquor be added , in order to redissolve ...
... silver , and copper , it says , that " if after these calces " ( i . e . , the cyanides or ferrocyanides of gold and silver ) " have been precipitated , a sufficient quantity of precipitating liquor be added , in order to redissolve ...
Página 39
... silver solution was employed hot ; now it is always used cold . Nickel silver was always the substance employed as a base for receiv- ing the deposit from the earliest period of electro - silver - plating , or at least soon after the ...
... silver solution was employed hot ; now it is always used cold . Nickel silver was always the substance employed as a base for receiv- ing the deposit from the earliest period of electro - silver - plating , or at least soon after the ...
Página 40
... silver was particularly apt to occur with articles made of Britannia metal , and with this particular alloy it was ... silver upon the article , by a powerful battery , in a solution containing but little cyanide of silver and much ...
... silver was particularly apt to occur with articles made of Britannia metal , and with this particular alloy it was ... silver upon the article , by a powerful battery , in a solution containing but little cyanide of silver and much ...
Página 41
... silver , and then coated with the precious metals , whereas by the old plan they required to be made from flat sheets of copper previously plated with silver by fusion ; the different parts of a complex figure were first stamped into ...
... silver , and then coated with the precious metals , whereas by the old plan they required to be made from flat sheets of copper previously plated with silver by fusion ; the different parts of a complex figure were first stamped into ...
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Palavras e frases frequentes
acid aluminium ammonia animals appears beautiful birds body bones branches British buds carbon carbonic acid cause chemical chloroform ciliary processes colour containing copper cornea cyanide deposit described diameter effect employed engine examined exhibited existence experiments fact feet Fungi geological glass green heat hymenium important inches interesting iron islands known leaves lens light lower manganese manufacture matter means metal microscope mineral minute mistletoe nearly nitrous oxide object observed obtained ordinary organic oxide P. L. Simmonds paper papillæ passed peculiar pileus plants plate Polypide Polyzoa portion present produced Professor quantity rays readers remarkable retina rock ROTIFERA scientific seen shoot side silver skin Society solution species specimens stars statoblasts stones structure substance sulphur sulphuric acid surface telescope temperature thallium tion tree tube various vegetable vessel whilst wood zinc
Passagens conhecidas
Página 393 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Página 343 - In thoughts from the visions of the night, when deep sleep falleth on men, Fear came upon me, and trembling, which made all my bones to shake. Then a spirit passed before my face ; the hair of my flesh stood up...
Página 392 - Authors of the highest eminence seem to be fully satisfied with the view that each species has been independently created. To my mind it accords better with what we know of the laws impressed on matter by the Creator, that the production and extinction of the past and present inhabitants of the world should have been due to secondary causes, like those determining the birth and death of the individual.
Página 350 - And the oracle in the forepart was twenty cubits in length, and twenty cubits in breadth, and twenty cubits in the height thereof: and he overlaid it with pure gold; and...
Página 392 - I believe that animals are descended from at most only four or five progenitors, and plants from an equal or lesser number.
Página 21 - As nitrous oxide in its extensive operation appears capable of destroying physical pain, it may probably be used with advantage during surgical operations in which no great effusion of blood takes place.
Página 496 - That, for instance, in acquiring the sensation of redness, our eyes are affected four hundred and eighty-two millions of millions of times ; of yellowness, five hundred and forty-two millions of millions of times ; and of violet, seven hundred and seven millions of millions of times per second...
Página 348 - Trees having this character of wood are rare, and do not exist in the proportion of one to a hundred. The serpentine direction of the fibre, which renders them difficult to split and to work, produces, in the hands of a skilful mechanic, the most beautiful effects of light and shade. These effects are rendered more striking, if, after smoothing the surface of the wood with a double-ironed plane, it is rubbed with a little sulphuric acid, and afterwards anointed with linseed oil.
Página 259 - Ag. fusipes to pickle, in clusters under them ; Puffballs, which some of our friends have not inaptly compared to sweet-bread for the rich delicacy of their unassisted flavour ; Hydna as good as oysters, which they somewhat resemble in taste ; Agaricus deliciosus, reminding us of tender lamb-kidneys ; the beautiful yellow Chantarelle, that kalon kagathon of diet, growing by the bushel...
Página 544 - Stopped the horses to clear a way, whilst I advanced a few yards on to the beach, and was gratified and delighted to behold the water of the Indian Ocean in Van Diemen's Gulf, before the party with the horses knew anything of its proximity. Thring, who rode in advance of me, called out "The Sea!