W gray horton (4 Ergebnisse)

Hardcover. Zustand: Good. ORIGINAL PUBLICATIONS; THREE (3) USGS Water Supply papers bound together, HARDCOVER; ex-library; chips on lower corner of a couple of the title pages; light creasing of corners of leaves; o/w all publications in good condition. 0. Book.

Zustand: Very Good. First edition hard back binding in publisher's original pale grey paper covers, gilt title and author lettering to the black spine. 8vo. 9½'' x 6¼''. Contains 135 printed pages of text with monochrome illustrations and photographs throughout. Spine ends a little creased, shallow rubs to the corners. Very Good condition book in Very Good condition dust wrapper with rubs to the corners, some sun damage to the colouring of the spine and upper panel, price clipped. SIGNED by the Author to the front free end paper 'With many thanks for all your help and do give me your criticisms in due course. If you have time! Sincerely Gray Horton 27 June 73.'. Dust wrapper supplied in archive acetate film protection, this preserves and prolongs the life of the paper, it is not adhered to the book or to the dust wrapper. Member of the P.B.F.A. ISBN 220799474 BUSINESS (Leadership).…

.- Madrid. 1973. Ediciones Pirámide. 4º menor. 150 p. Cartoné editorial. Sello anterior poseedor. Etiqueta en lomera. Economía - Empresa, . . .

New York, American Telephone and Telegraph Company, 1927. 8vo. Original full green cloth. Volume VI, 1927 of The Bell System Technical Journal. Library stamp to front free end-paper and title page. Minor bumping to extremities. A nice and clean copy. Pp. 560-603. [Entire volume: (6), 754 pp.]. First edition of the influential paper on television signals. Gray was highly influential in the development of television and conducted pioneering research in this field. "The design of a television system, once the fundamental principles are understood, involves a detailed consideration of the methods by which the several important functions are to be performed.(1) In the present system the initial signal wave is obtained by sweeping a spot of light over the subject in parallel lines completely scanning it once every 18th of a second. The light reflected is collected by large photoelectric cells which control the transmitted current." (From the introduction to the present paper)."A spotlight scanning method was adopted (in the present paper) to illuminate the subject, the beam of light being obtained from a 40A Sperry arc. Three photoelectric cells of the potassium hydride, gas-filled type were specially constructed and utilised to receive the reflected light from the subject. At that time they were probably the largest cells that had ever been made and presented and aperture of 120 square inches." (Burns, R. W. Communications: an international history of the formative years, 2004, p. 497). Other papers of interest contained in the present volume:John Carson:1. Electromagnetic Theory and the Foundations of Electric Circuit Theory. Pp. 1-17.2. Propagation of Periodic Currents over a System of Parallel Wires. Pp. 495-545.E. C. Molina:1. Application of the Theory of Probability to Telephone Trunking Problems. Pp. 461-494.…