By Edoardo Benvenuto
This booklet is among the most interesting i've got ever learn. to put in writing a foreword for it's an honor, tricky to just accept. we all know that architects and grasp masons, lengthy prior to there have been mathematical theories, erected constructions of spectacular originality, power, and wonder. a lot of those nonetheless stand. have been it now not for our now acid surroundings, lets anticipate them to face for hundreds of years extra. We recognize early architects' obvious good fortune within the distribution and stability of thrusts, and we presume that grasp masons had principles, probably held mystery, that enabled them to show architects' daring designs into fact. we all know that rational theories of energy and elasticity, created centuries later, have been stimulated via the wondrous structures that males of the 16th, 17th, and eighteenth centuries observed day-by-day. Theorists be aware of that after, finally, theories began appearing, architects distrusted them, in part simply because they typically omitted info of significance in genuine building, partially simply because not anyone yet a mathematician may possibly comprehend the purpose and func tion of a mathematical conception designed to symbolize a facet of nature. This booklet is the 1st to teach how statics, energy of fabrics, and elasticity grew along current structure with its millenial traditions, its host of successes, its ever-renewing types, and its a number of difficulties of upkeep and service. In reference to reports towards fix of the dome of St. Peter's by means of Poleni in 1743, on p.
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Additional resources for An Introduction to the History of Structural Mechanics: Part I: Statics and Resistance of Solids
Galluzzi, Momento: Studi galileiani (Rome, 1978). 4. Momentum: Fixed Word, Fluid Concept 17 extraordinary and eventful history of this concept. His analysis goes back to biblical times, and discusses the Hebrew term sal],aq, which means the fine "dust" added to the weight on a scale, so light that it fails to disturb the scale's balance (see Isaiah 40:15). In Latin, momentum ponderis signified the tiny weight that just offsets the scale, however slightly, that next-to-nothing which causes a slight inclination, while momentum temporis suggested the temporal instant, the indivisible unit of time.
The nineteenth century reversed this, accepting energy as conserved and as twofold: potential (concerning forces, usually independent of velocity) and kinetic, or actual (concerning motion, proportional to squared velocity). Of course the conservation law is not valid for all mechanical systems, since energy can be dissipated in a number of ways. In two letters to Euler (24 May and 8 November 1738) Daniel Bernoulli recognized one such in the non-elastic impact, foreseeing the existence of non-mechanical forms of energy.
56 These themes are difficult and fascinating, but all we can do is to dangle them before the reader, to tease his curiosity, since even to touch on them would involve a lengthy argument.
An Introduction to the History of Structural Mechanics: Part I: Statics and Resistance of Solids by Edoardo Benvenuto