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The Times Science Review, Summer (1955)8. �6. C. W. Munday and G. R. Primavesi, "Vapor Phase ���� Chromatography", (Ed. D.H. Desty and C. L. A. Harbourn), ����� ButterworthsScientific� Publications,(1957)146. �7. N. H. Ray, J. Appl. Chem., 4(1954)21. �8. �R. P. W. Scott, "Vapor Phase Chromatography" (Ed. D.H. Desty ����� and C. L. A.Harbourn), Butterworths Scientific Publications, ����� (1957)131. �9.� �H. Boer, "Vapor Phase Chromatography" (Ed. D.H. Desty and C. ������ L. A. Harbourn), Butterworths Scientific Publications (1957)169. 10. D. W. Grant, "Gas Chromatography 1958" (Ed. D. H. Desty), ����� Butterworths Scientific Publications, (1957)153. 11. N. H. Ray, J. Appl. Chem., 4(1954)21. 12. 1.� J. Harley, W. Neland V. Pretorious, Nature, London, ����� 181(1958)177. 13.� I. G. McWilliams and R. A. Dewer, "Gas Chromatography 1958", ������ (Ed. D. H.Desty), Butterworths Scientific Publications 14. �S. A.

Inst. Petrol., 287(1959)45. 4. R. D. Dandedau and E. M. Zenner, J. High Res. Chromatography, 2(1979)351. 5. K.L.Ogan, C. Reese and R. P. W. Scott, J. Chromatogr. Sci., 20(1982)425. 6. J. Harley, W. Nel and V. Pretorious, Nature, London, 181(1958)177. 7. I. G. McWilliams and R. A. Dewer, "Gas Chromatography 1958", (Ed. D. H. Desty), Butterworths Scientific Publications (1957)142. 8. R. P. W. Scott, "Vapor Phase Chromatography" (Ed. D.H. Desty and C. L. A.Harbourn), Butterworths Scientific Publications, (1957)131. 9. C. E. Reese, Ph. D. Thesis, University of London (Birkbeck

nbsp; Desty et al. also showed that the air flow should be at least 6 times that of the hydrogen flow for stable conditions and completecombustion. They also demonstrated that thebasecurrentfromthehydrogenflowdepends strongly onthepurityofthehydrogen. As would be expected, tracesof hydrocarbons significantly increase the base current. Consequently, very pure hydrogen should be employed with the FID if maximum sensitivity is required. Employing purified� hydrogen Desty et al. reported a base current of

nbsp; They employed a similar device as that invented by Desty but the drawing roller was extended below the drawing oven to allow the insertion of two coating nozzles and two drying ovens. The polymer they employed was Pyralin PI-2550 (Dupont) and was used neat or as a solution n N-methyl-2-pyrrolidone. Previous experience with the rigid columns of Desty provided suitable deactivating and coating techniques and the low activity of the surface is confirmed by the chromatograms shown in figure 4.   The typical base/acid pair, 2,4-dimethylaniline

J. Chromatogr. Sci., 10(1972)654. � 5. S. Golshan-Shirazi, A. Jaulmes and G. Guiochon, Anal. Chem., ���� 60(1988)1856. � 6. S. Golshan-Shirazi, A. Jaulmes and G. Guiochon, Anal. Chem., ���� 61(1989)1276. � 7. S. Golshan-Shirazi, A. Jaulmes and G. Guiochon, Anal. Chem., ���� 61(1989)1368. � 8. J. M. Miller and R. Strusz, Am. Lab. Jan(1970)29. � 9. T. Filipi US Patent 4175037 Nov 20 the 1979. 10. M. Freund, P. Benedek and L. Szepesy, Vapour Phase ���� Chromatogrphy, (Ed. D. H. Desty) Butterworths Scientific ����� Publications, London, (1957)359. 11.10. R. P. W. Scott, Gas Chromatogrphy 1958,� (Ed. D. H. Desty) ���� Butterworths Scientific Publications, London, (1958)287. 12. R. P. W. Scott and R. J. Maggs, Benzole Producers Research ��� Paper, �5�1960. 13. P. E. Barker� Preparative Gas Chromatography, (Ed. A. Zlakiz ���� and V. Pretorious) Wiley Interscince, London, (1971)325. 14. P. E. Barker and R. E. Deeble, Anal. Chem., 45(1973)1121. 15. R. Hurrel,

Desty et al. (4), tried to eliminate the activity of the open tubular column surface by developing the first silica-based columns and invented an extremely clever device for drawing soft glass capillaries. Desty produced both circular rigid soft glass and circular rigid Pyrex capillary columns, but their permanent circular shape, made them difficult to fit to unions connecting columns to injector and column to detector. By careful surface treatment the rigid glass tubes could be coated