Britannica Educational Publishing 
Computing [PDF ebook] 

Humans have long attempted to mechanize calculations-mathematical and otherwise-and build problem-solving machines. Yet it was not until the 20th century, with the advent of the computer, that such technology truly hit its stride. Indispensable to nearly all industry and increasingly vital to individuals around the globe, the computer has come to be an icon of the modern age. This insightful volume chronicles the history of computing devices, from simple tabulators such as the abacus and the earliest analog calculators to the tablet computer. Also adroitly covered is how the Internet has spurred computing innovation.