 502  6. Britain's greatest single source of wealth is coal; it was this abundance of fuel which made it possible for her to take full advantage of the industrial revolution. 7. It was only in 1781 that Emerson invented the process of direct fusion of the metals to produce a copper — zinc alloy we call brass. 8. The refractive index of amorphous selenium at a wavelength of 2.5 microns has been reported to be 2.46 or 2.44 by different authors. 9. However, the hypothesis of Siekevitz and Potter has been criticized on the grounds that AMP did not stimulate oxygen consumption as quickly as did ADP. 10. There is one important factor to be considered when a phase discriminator is used. 11. The equal spacing between components appears to make double flip-flops possible in most configurations. 12. They succeeded in obtaining good results working with quicksilver, it being known to be a very dangerous metal. 13. Project Telstar was planned from the first as being primarily a communications experiment. 14. The Boltzmann expressions for the transition probabilities are shown to have been applied under conditions for which they are not valid. упражнения 15. It is desirable that the output signal should be a linear function of the input signal; any deviation from linearity is called distortion and is highly undesirable. 16. There have been rumours that more efficient carburators have been invented which are said to have increased the gazoline milage of automobiles by as much as 100 per cent. 17. The effect is highly dependent on frequency with the lower frequencies showing less noise. 18. Many proposals for changing the traditional methods of storing and searching for information have been made in the last decade, and some of these have already proved to be of considerable practical value. 502 |
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