On the Spectra of the Compounds of Carbon with Hydrogen and NitrogenNoII . o not appear in carbonic oxide atreduced pressures, as a proof that these bands were due to carbon only^ 1880.] On the Spectra of the Compounds of Carbon^ <^e. 503 we have made a series of careful experiments with carbonic oxideat atmospheric pressures. In our first experiments with this substance the gas was made bythe action of sulphuric acid on dried formiate of sodium. The driedformiate was placed in a flask (fig. (5) fitted with a rubber stopper,through which passed the tube of a globe funnel, with a stop-cock f
On the Spectra of the Compounds of Carbon with Hydrogen and NitrogenNoII . o not appear in carbonic oxide atreduced pressures, as a proof that these bands were due to carbon only^ 1880.] On the Spectra of the Compounds of Carbon^ <^e. 503 we have made a series of careful experiments with carbonic oxideat atmospheric pressures. In our first experiments with this substance the gas was made bythe action of sulphuric acid on dried formiate of sodium. The driedformiate was placed in a flask (fig. (5) fitted with a rubber stopper,through which passed the tube of a globe funnel, with a stop-cock forthe admission of the sulphuric acid, and an exit tube for the gas. Thelatter was plugged with asbestos to catch any liquid drops whichmight be thrown up, and was connected by a thick rubber tube to atube of the form shown in fig. 6. That part of this tube marked awas filled, one-half with soda-lime to catch acids, and the other halfwith phosphoric anhydride to catch moisture; the gas, after passingthrough this tube, was burnt as it issued from the narrow opening at The spectrum of the spark was observed through the small bulb blownon the end. The sulphuric acid was introduced gradually through thefunnel, and the stream of gas allowed to pass through the tube fora long time. Sparks were passed between the wires, and the spectrumobserved from time to time. At first the six violet bands were wellseen, and the seven blue bands faintly; but gradually, as the airbecame more completely expelled, the blue bands disappeared entirely,and then the violet bands so far died out that it was only by manipu-lating the coil that they could be made visible, and then only veryfaintly indeed. A bubble of air, estimated by the length of the tubeit filled to be about -^^ of the volume of gas in the flask and tube,was now introduced through the funnel, and almost immediately thebands reappeared brightly. As the stream of gas however continued,they again gradually died away until they were repre
Size: 1980px × 1262px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectproceed, bookyear1879
