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Leonardo da Pisa, perhaps better known as Fibonacci (ca. 1170 - ca. 1240), selected the most useful parts of Greco-Arabic geometry for the book known as De practica geometrie. Beginning with the definitions and constructions found early on in Euclid's Elements, Fibonacci instructed his reader how to compute with Pisan units of measure, find square and cube roots, determine dimensions of both rectilinear and curved surfaces and solids, work with tables for indirect measurement, and perhaps finally fire the imagination of builders with analyses of pentagons and decagons. His work exceeded what readers would expect for the topic. Practical Geometry is the name of the craft for medieval landmeasurers, otherwise known as surveyors in modern times. Fibonacci wrote De practica geometrie for these artisans, a fitting complement to Liber abbaci. He had been at work on the geometry project for some time when a friend encouraged him to complete the task, which he did, going beyond the merely practical, as he remarked, "Some parts are presented according to geometric demonstrations, other parts in dimensions after a lay fashion, with which they wish to engage according to the more common practice." This translation offers a reconstruction of De practica geometrie as the author judges Fibonacci wrote it. In order to appreciate what Fibonacci created, the author considers his command of Arabic, his schooling, and the resources available to him. To these are added the authors own views on translation and remarks about early Renaissance Italian translations. A bibliography of primary and secondary resources follows the translation, completed by an index of names and special words.

Geometry --- Mathematics, Medieval. --- Geometry. --- Mathematics --- Physical Sciences & Mathematics --- Medieval mathematics --- Mathematics. --- History. --- History of Mathematical Sciences. --- Mathematics, Greek --- Euclid's Elements --- Annals --- Auxiliary sciences of history --- Math --- Science

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"Electric Motors and Drives" is intended for non-specialist users of electric motors and drives, filling the gap between maths- and theory-based academic textbooks and the more prosaic 'handbooks', which provide useful detail but little opportunity for the development of real insight and understanding. The book explores all of the widely-used modern types of motor and drive, including conventional and brushless D.C., induction motors and servo drives, providing readers with the knowledge to select the right technology for a given job. The third edition includes additional diagrams and worked examples throughout. New topics include digital interfacing and control of drives, direct torque control of induction motors and current-fed operation in DC drives. The material on brushless servomotors has also been expanded. Austin Hughes' approach, using a minimum of maths, has established Electric Motors and Drives as a leading guide for electrical engineers and mechanical engineers, and the key to a complex subject for a wider readership, including technicians, managers and students. The key features are: acquire knowledge of and understanding of the capabilities and limitations of motors and drives without struggling through unnecessary maths and theory; updated material on the latest and most widely-used modern motors and drives, including brushless servomotors; and new edition includes additional diagrams and worked examples throughout.


electrical properties --- Motorcars engineering --- auto's --- elektrische aandrijvingen --- PLC-sturing --- Stappenmotoren --- Sturing --- Electric motors. --- Electric driving. --- Agrotechnology and Food Sciences. Engineering --- Mechanical and Electronic Engineering. --- Elektrische machines

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Peter the Great (1672-1725), tsar of Russia for forty-three years, was a dramatic, appealing, and unconventional character. This book provides a vivid sense of the dynamics of his life-both public and private-and his reign.Drawing on his letters and papers, as well as on other contemporary accounts, the book provides new insights into Peter's complex character, giving information on his actions, deliberations, possessions, and significant fantasy world--his many disguises and pseudonyms, his interest in dwarfs, his clowning and vandalism. It also sheds fresh light on his relationships with individuals such as his second wife Catherine and his favorite, Alexander Menshikov. The book includes discussions of Peter's image in painting and sculpture, and there are two final chapters on his legacy and posthumous reputation up to the present.

Emperors --- Peter --- Peter I --- Petr Velik --- Alekseyevich, Pyotr --- Veliky, Pyotr --- Pierre le Grand --- Russia --- Soviet Union --- History --- Buṭrus, --- Mikhaĭlov, Petr, --- Peeter --- Peter, --- Petr I Alekseevich, --- Petr --- Petr, --- Petro, --- Petru, --- Pierre --- Pierre, --- Pietro, --- Piotr, --- Pyōtoru Taitei, --- Pyotr --- Pyotr, --- Romanov, Petr Alekseevich, --- Romanov, Pyotr Alexeyevich, --- Романов, Петр Алексеевич, --- Петр

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Geometry --- Mathematics --- geschiedenis --- wiskunde --- geometrie