The Polar Planimeter and Its Use in Engineering Calculations Together with Tables, Diagrams and Factors for the Immediate Adjustment of the Instrument for the Solution of Problems involving: The measurement of large and small areas, average or mean height of indicator and similar diagrams, determination of centre of gravity, measurement of volumes of railway and canal excavation, volumes in grading and dredging operations, volumes in reservoir and similar design and construction, quantities and volumes of brickwork, weights of iron and other metals in construction, measurement of displacement diagrams, etc., etc., etc.

Although it is popularly assumed that the history of computing before the second half of the 20th century was unimportant, in fact the Industrial Revolution was made possible and even sustained by a parallel revolution in computing technology. An examination and historiographical assessment of key developments helps to show how the era of modern electronic computing proceeded from a continual computing revolution that had arisen during the mechanical and the electrical ages. This unique volume introduces the history of computing during the “first” (steam) and “second” (electricity) segments of the Industrial Revolution, revealing how this history was pivotal to the emergence of electronic computing and what many historians see as signifying a shift to a post-industrial society. It delves into critical developments before the electronic era, focusing on those of the mechanical era (from the emergence of the steam engine to that of the electric power network) and the electrical era (from the emergence of the electric power network to that of electronic computing). In so doing, it provides due attention to the demarcations between—and associated classifications of—artifacts for calculation during these respective eras. In turn, it emphasizes the history of comparisons between these artifacts. Topics and Features: motivates exposition through a firm historiographical argument of important developments explores the history of the slide rule and its use in the context of electrification examines the roles of analyzers, graphs, and a whole range of computing artifacts hitherto placed under the allegedly inferior class of analog computers shows how the analog and the digital are really inseparable, with perceptions thereof depending on either a full or a restricted view of the computing process investigates socially situated comparisons of computing history, including the effects of a political economy of computing (one that takes into account cost and ownership of computing artifacts) assesses concealment of analog-machine labor through encasement (“black-boxing”) Historians of computing, as well as those of technology and science (especially, energy), will find this well-argued and presented history of calculation and computation in the mechanical and electrical eras an indispensable resource. The work is a natural textbook companion for history of computing courses, and will also appeal to the broader readership of curious computer scientists and engineers, as well as those who generally just have a yearn to learn the contextual background to the current digital age. "In this fascinating, original work, Tympas indispensably intertwines the histories of analog and digital computing, showing them to be inseparable from the evolution of social and economic conditions. " Prof. David Mindell, MIT

Originally developed in 1993 for an auction of an Architect's private collection of over 1,500 drawing instruments and calculators; this extensive book is one of a few comprehensive references available for comparative study of these instruments. The original collection was assembled over a twelve year period from sources in the US and Europe. Each instrument is listed in a scientific format for comparative evaluation and identification. An abbreviations table supports this approach. Profusely illustrated with 113 color photos and 61 highly organized text pages. The Subject Index has over 400 individual references dissecting this impressive collective of instruments from the 18th C. thru the mid 20th century. Instruments are categorized by Maker, Country, Period of Manufacture and function. Different instrument makers and suppliers are referenced to over 300 individual items. The four page Table of Contents provides a logical and extremely useful subjective summary of the catalog contents so that whatever the instrument or drawing tool, its location can be easily found. The photographs were taken with the idea of showing these important instruments in a comparative array. Researchers and collectors will find this a valuable resource. These instruments represent a most prolific period of time in our history of invention and advancements in technology. Computers are the new tools which demand a new pace of design and documentation.... They leave behind the centuries of drawing instruments that were the connection from the hand to the paper.