How Round Is Your Circle
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How Round Is Your Circle?
Author: John Bryant
language: en
Publisher: Princeton University Press
Release Date: 2011-02-28
How do you draw a straight line? How do you determine if a circle is really round? These may sound like simple or even trivial mathematical problems, but to an engineer the answers can mean the difference between success and failure. How Round Is Your Circle? invites readers to explore many of the same fundamental questions that working engineers deal with every day--it's challenging, hands-on, and fun. John Bryant and Chris Sangwin illustrate how physical models are created from abstract mathematical ones. Using elementary geometry and trigonometry, they guide readers through paper-and-pencil reconstructions of mathematical problems and show them how to construct actual physical models themselves--directions included. It's an effective and entertaining way to explain how applied mathematics and engineering work together to solve problems, everything from keeping a piston aligned in its cylinder to ensuring that automotive driveshafts rotate smoothly. Intriguingly, checking the roundness of a manufactured object is trickier than one might think. When does the width of a saw blade affect an engineer's calculations--or, for that matter, the width of a physical line? When does a measurement need to be exact and when will an approximation suffice? Bryant and Sangwin tackle questions like these and enliven their discussions with many fascinating highlights from engineering history. Generously illustrated, How Round Is Your Circle? reveals some of the hidden complexities in everyday things.
Circle Round
In our rushed, stressed society, it's sometimes difficult to spend meaningful time as a family. Now Starhawk, Diane Baker, and Anne Hill offer new ways to foster a sense of togetherness through celebrations that honor the sacredness of life and our Mother Earth. Goddess tradition embraces the wheel of life, the never-ending cycle of birth, growth, love, fulfillment, and death. Each turn of the wheel is presented here, in eight holidays spanning the changing seasons, in rites of passage for life transitions, and in the elements of fire, air, water, earth, and spirit. Circle Round is rich with songs, rituals, craft and cooking projects, and read-aloud stories, as well as suggestions for how you can create your own unique family traditions. Here are just some of the ways to make each event in the cycle of life more special: Mark Summer Solstice by making sweet-smelling herb pillows for good dreams Send a teenager off to college with the Leaving Behind and Carrying With rituals Comfort an injured child with the Tree of Life meditation Commemorate a loved one by planting or donating a tree As a one-of-a-kind resource for people of many faiths and beliefs, Circle Round will be a beloved companion in your home for years to come.
The Circle Way
Author: Christina Baldwin
language: en
Publisher: Berrett-Koehler Publishers
Release Date: 2010-03
Meetings in the round have become the preferred tool for moving individual commitment into group action. This book lays out the structure of circle conversation, based on the original work of the authors who have standardized the essential elements that constitute circle practice.