Chemical News and Journal of Industrial Science, Tom 144,Wydanie 3750Chemical news office., 1932 |
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Strona 131
... later . By fusing on a charcoal block before a blowpipe , it is pos- sible to obtain a bead of the actual metal . This was first performed by J. G. Gahn , in 1774 . While dealing with the knowledge of analysis prior to 1750 , we may ...
... later . By fusing on a charcoal block before a blowpipe , it is pos- sible to obtain a bead of the actual metal . This was first performed by J. G. Gahn , in 1774 . While dealing with the knowledge of analysis prior to 1750 , we may ...
Strona 132
... later , made use of fluxes , as micro- cosmic salt , or purified carbonate of soda , or borax that had been freed from its water of crystallisation . Besides the heating on charcoal , there was cyanite , used by De Saussure , and later ...
... later , made use of fluxes , as micro- cosmic salt , or purified carbonate of soda , or borax that had been freed from its water of crystallisation . Besides the heating on charcoal , there was cyanite , used by De Saussure , and later ...
Strona 133
... later ) . 3. Does it fume in air . 4. Test with litmus paper ( Boyle ) . 5. Turmeric ( for ammonia , due to Bergman , though turmeric was known as an indicator even to Boyle ) . 6. Bleaching effects . 7. Glowing splint ( Priestley ...
... later ) . 3. Does it fume in air . 4. Test with litmus paper ( Boyle ) . 5. Turmeric ( for ammonia , due to Bergman , though turmeric was known as an indicator even to Boyle ) . 6. Bleaching effects . 7. Glowing splint ( Priestley ...
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