Chemical News and Journal of Industrial Science, Tom 144,Wydanie 3750Chemical news office., 1932 |
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Strona 130
... placed in a cupboard so that draughts may not vitiate the results . The ore must first be broken with a hammer and then ground in a mortar , and if neces- sary softened by saturating with vinegar . Crucibles were to be covered with ...
... placed in a cupboard so that draughts may not vitiate the results . The ore must first be broken with a hammer and then ground in a mortar , and if neces- sary softened by saturating with vinegar . Crucibles were to be covered with ...
Strona 131
... placed on a very hot plate of iron , it will burn . It is evident from this that the element was well known in Black's time . He goes on to say that it may also be recognised by the fact that it turns copper white , another observation ...
... placed on a very hot plate of iron , it will burn . It is evident from this that the element was well known in Black's time . He goes on to say that it may also be recognised by the fact that it turns copper white , another observation ...
Strona 135
... placed in an air oven at 110 ° C . for one month . Other slides were prepared in the same way and placed in a glass - stoppered vessel provided with inlet and outlet tubes , through which coal gas could be passed on its way to the air ...
... placed in an air oven at 110 ° C . for one month . Other slides were prepared in the same way and placed in a glass - stoppered vessel provided with inlet and outlet tubes , through which coal gas could be passed on its way to the air ...
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