+1. Really appreciate this. On Sat, Jul 6, 2019 at 11:21 AM Jon Jackson <jondad...@gmail.com> wrote:
> Many thanks to Martin Forsberg !! > > On Sat, Jul 6, 2019 at 8:07 AM Nick <gerbilparty...@gmail.com> wrote: > >> This is a brilliant effort. Can we put them in the library section here? >> >> Weston has been out of print for ages, but is a truly excellent >> reference... >> >> Nick >> >> On Saturday, 6 July 2019 08:27:00 UTC+1, Sgitheach wrote: >>> >>> Another book scanned by Martin Forsberg. All thanks to him! >>> >>> !!!THE BOOK!!! >>> >>> Download 28MB >>> >>> >>> https://www.dropbox.com/s/ne5vvdqw1r0pu6m/Cold%20Cathode%20Glow%20Discharge%20Tubes%20G%20F%20Weston-OCR.pdf?dl=0 >>> >>> Grahame >>> >>> *PREFACE* >>> >>> *Cold cathode glow discharge tubes are not new, they have evolved over >>> the* >>> *years from the early neon glow lamp, alongside the thermionic valve, to >>> find* >>> *application as indicators, voltage stabilisers, and as switches in >>> low-current* >>> *control circuits. Technical improvements and added sophistication of >>> design* >>> *in modern tubes have widened their application, and even in the face of* >>> *competition from semiconductor devices, which have virtually superseded* >>> *the vacuum tube, the cold cathode tube offers a versatile and reliable >>> active* >>> *element useful for control and computing applications where the highest* >>> *speeds are not essential.* >>> *Most of the newer tubes have been designed to operate with transistor* >>> *circuits. In general they are cheaper than either semiconductor devices >>> or* >>> *vacuum tubes, and in some applications they can perform functions which* >>> *would require complex circuitry were alternative devices to be used. >>> They* >>> *have a long operational life with the added advantages of light output >>> (useful* >>> *for servicing purposes), and the ability to withstand severe overloads. >>> For* >>> *read-out and display purposes no satisfactory semiconductor alternative >>> as* >>> *yet exists.* >>> *However, although cold cathode tubes are simple in design and >>> construction,* >>> *satisfactory use by the engineer requires a deeper knowledge of their* >>> *mechanism and behaviour than perhaps is required for thermionic vacuum* >>> *tubes or semiconductors. For example, far more attention has to be paid >>> in* >>> *designing circuits to the tolerances and life stability of cold cathode >>> tubes* >>> *than for other devices. This is mainly due to the fact that for valves >>> and* >>> *semiconductors, which have continuous and reversible control >>> characteristics,* >>> *the wide variations within the tube and circuit can be compensated for >>> by* >>> *negative feedback, whereas for cold cathode tubes with discontinuous* >>> *characteristics no such compensation can be provided. Thus the engineer* >>> *must be familiar with the parameters and circuit techniques peculiar to >>> this* >>> *class of device if full advantage is to be taken of its inherent >>> reliability and* >>> *economy.* >>> *A much wider use could be made of cold cathode tubes if the relevant* >>> *knowledge were more readily available. Unfortunately, whereas there are* >>> *numerous publications dealing with thermionic and semiconductor devices* >>> *and related circuit techniques, there is a dearth of information on >>> cold* >>> *cathode tubes. ln fact the circuit engineer relies almost exclusively >>> on the* >>> *manufacturer promoting the tubes for the necessary information to >>> enable* >>> *him to employ successfully the tube in his equipment. On this point it >>> is* >>> *noticeable the extent to which cold cathode tubes of all types are >>> employed* >>> *in Europe, where the manufacturing companies are most active, compare d* >>> *with the United States where, apart from numerical indicators, they are* >>> *hardly ever used.* >>> *The main aim of this book, therefore, is to present comprehensive >>> information* >>> *for the electronic engineer on the underlying physics of the glow >>> discharge,* >>> *on the design, construction, and performance of a wide range of* >>> *cold cathode tubes, and on the basic circuits and their applications. >>> lt is* >>> *hoped that by so doing the engineer will be helped to a better >>> understanding* >>> *of the devices and will be enabled to make more use of their >>> potentialities.* >>> *The first five chapters of the book deal with that part of >>> gas-discharge* >>> *physics which is pertinent to cold cathode glow discharge tubes. The >>> subject* >>> *is dealt with in more detail than is strictly necessary for >>> understanding the* >>> *devices, but is aimed at bridging the gulf between the fundamental >>> gasdischarge* >>> *research being carried out in the universities and similar >>> establishments,* >>> *and the more applied physics and empirical data used by the tube* >>> *designer. Chapter 1 deals with ionisation in the gas and secondary >>> emission* >>> *mechanism at the cathode, represented by the Townsend first and second* >>> *coefficients respectively. The two processes together are responsible >>> for the* >>> *electron multiplication in the gas, which dictates the values of the >>> potential* >>> *required for initiating a glow discharge (breakdown potential) and the* >>> *potential at which it is self-sustained (maintaining potential). >>> Detailed and* >>> *up-to-date data on the Townsend coefficients are given for the inert >>> gases* >>> *and cathode materials common to commercially available tubes. The >>> effects* >>> *of electric field and gas pressure are discussed. In Chapter 2 a survey >>> is made* >>> *of the breakdown mechanism and characteristics of a glow discharge in >>> the* >>> *light of Chapter 1 , together with published empirical results. The >>> self-sustained* >>> *discharge is similarly dealt with in Chapter 3. In these two chapters* >>> *emphasis is laid on low pressure discharges, i.e. pressures below >>> atmospheric,* >>> *and in the case of the self-sustained discharge the cathode-fall zone >>> is mainly* >>> *dealt with. Chapter 4 is devoted to cathodic sputtering, the removal of* >>> *cathode material by the impinging ions, since it plays an important >>> rote in* >>> *the processing and performance of cold cathode tubes. Account is given >>> of* >>> *the work at low pressures or in a vacuum and on the various theories, >>> as* >>> *weil as information on sputtering in the glow discharge. In Chapter 5, >>> the* >>> *temporal growth and decay of a glow dischargc is discussed. These time* >>> *effects are important when considering the specd at which cold cathode >>> tubes* >>> *can be switched.* >>> *Although the gas discharge physics dealt with in these first chapters >>> is* >>> *limited in scope, being only that part which is relevant to cold >>> cathode tubes,* >>> *nevertheless within this limitation the subject has been treated fairly >>> thoroughly* >>> *with full bibliography and including unpublishcd work from the* >>> *Author's laboratory. lt is thus hoped that it will prove a useful >>> refercnce* >>> *source for the physicist or design cngineer engaged on the developmcnt >>> and* >>> *manufacture of cold cathode tubes or similar devices, and be a >>> complementary* >>> *book for the advanced student reading gas discharge physics.* >>> *In the four remaining chapters of the book a wide range of tube types >>> is* >>> *described. Attention is drawn to the basis for their design in tcrms of >>> the* >>> *parameters discussed in the earlier chapters, and details are given of >>> construction,* >>> *processing, and performance. In this the author has been fortunate* >>> *in being able to draw upon the experience and knowledge of the various* >>> *development and application laboratories of the Philips/Mullard >>> organisation,* >>> *and to present considerable previously unpublished information. Basic* >>> *circuits, most of which have been tested in the associated applications* >>> *laboratories are given and applications are described. The chapters are* >>> *classified according to tube types; Chapter 6 deals with stabilisers >>> and* >>> *reference tubes, including corona tubes, Chapter 7 with switching >>> diodes and* >>> *trigger tubes, Chapter 8 with stepping tubes, and Chapter 9 with >>> display* >>> *tubes. Other tubes which might equally be classed as cold cathode glow* >>> *discharge tubes, such as Geiger counters, T.R. cells and spark gaps >>> have* >>> *been omitted, as have cold cathode arc-discharge tubes, since they are >>> of* >>> *different character requiring a rather different approach.* >>> *Although cross-reference between chapters occurs in some places, >>> attempt* >>> *has been made to keep each chapter self-contained, so that the engineer* >>> *desiring information on a particular device can obtain a detailed >>> account of* >>> *the tube and its circuit application without having to read earlier >>> chapters.* >>> *The author gratefully acknowledges the co-operation and encouragement* >>> *of his colleagues in the research and in the development laboratories. >>> He is* >>> *particularly indebted to Dr. R. F. Hall who read the manuscript and >>> made* >>> *many useful suggestions and corrected a number of errors.* >>> >>> *Mullard Research Laboratories, Redhill, Surrey G.F.W.* >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neonixie-l+unsubscr...@googlegroups.com. >> To post to this group, send email to neonixie-l@googlegroups.com. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/6aa23d5c-b196-4bd7-bf06-cddf99a530b6%40googlegroups.com >> <https://groups.google.com/d/msgid/neonixie-l/6aa23d5c-b196-4bd7-bf06-cddf99a530b6%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neonixie-l+unsubscr...@googlegroups.com. > To post to this group, send email to neonixie-l@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CAC%3Dcyqfq9On2Fhb4HXzppEo3HYB30Q4N1%2BYygu-QOgVXFH%3DJHQ%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CAC%3Dcyqfq9On2Fhb4HXzppEo3HYB30Q4N1%2BYygu-QOgVXFH%3DJHQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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