William Oughtred was a prominent mathematician and educator in the seventeenth century, known for his significant contributions to mathematics and teaching methods. His work emphasized the importance of mathematical principles and their applications, making complex concepts accessible to students. Oughtred is best known for his invention of the slide rule, which revolutionized calculations and became an essential tool for engineers and scientists. His pedagogical approach combined clarity ...

"On the History of Gunter's Scale and the Slide Rule During the Seventeenth Century" by Florian Cajori is a detailed exploration of the development and significance of Gunter's scale and the slide rule in the context of 17th-century mathematics and engineering. Cajori meticulously examines the historical background, the mathematical principles involved, and the practical applications of these tools. His work highlights how these instruments revolutionized calculations and measurements, pav...

This book treats of the evolution of the US dollar mark, the history and curiosities of American coinage.The United States dollar, adopted in 1785, was avowedly modelled on the average weight of the Spanish dollar coins in circulation. Thomas Jefferson speaks of the dollar as "a known coin, and the most familiar of all to the minds of the people." No United States dollars were actually coined before the year 1794. We proceed to unfold our data and to show the evolution of the dolla...

The slide rule, with its many variations, has been vital to mathematics and engineering since its invention in the 17th century. Interest in this field has grown dramatically and collectors can still find much material at affordable prices. Unfortunately there has been little information available except for manufacturers manuals and catalogs, making this reprint of Cajori's classic particularly valuable. Also included with this reprint of the 1910 edition is Cajori's extensive article On ...