Building an astronomical telescope offers the amateur astronomer an exciting challenge, with the possibility of ending up with a far bigger and better telescope than could have been afforded otherwise. In the past, the starting point has always been the grinding and polishing of at least the primary mirror, a difficult and immensely time-consuming process. But now that the Internet has brought us together in a global village, purchasing off-the-shelf goods such as parabolic mirrors, eyepieces, lenses, and telescope tubes, is possible. There are also a vast number of used mirrors and lenses out there, and it is now possible to track them down almost anywhere in the world. Online stores and auction houses have facilitated commerce regarding all sorts of useful optical components at a reasonable price. This is a book about making telescopes from available parts. It provides guidance on where to look and what to look for in selecting items useful for telescope making and explains how to assemble these components to produce an excellent instrument on a tight budget. At one time, many amateurs made their own telescopes from home-made parts. In today's rushed world, that has almost become a lost art. The Internet offers a wonderful alternative to either buying a pricey scope fully assembled or making your own from scratch.
The journal entries from Scott's 1829-30 trip present a vivid picture of Jacksonian America and of the prominent people of the era. In the second half of the book, Clark traces the later life of this fascinating diarist.
Aging men and women are increasingly remaining in the labor force. Most often the reason for this is that they need to work additional years in order to be able to support an increasing number of years in retirement. This leaves employers scrambling for ways to adapt to a growing number of retirement-aged workers. Clark and Morrill provide a thorough assessment of the costs and benefits of accommodating later retirement ages, and they describe options employers may use to create some new form of employment contract with aging workers. The most prominent issues employers with aging workers face are declining productivity, rising labor and benefits costs, and a suboptimal age distribution of their workforces. According to the authors, employers could respond to these issues by finding new ways to accommodate older workers with, for instance, phased retirement and return-to-work policies. But the success of such policies also depends on tax policies and whether government-provided retirement benefits could be redesigned to play a role in a newly-defined employment relationship.
Treatment Marshes for Runoff and Polishing represents the most comprehensive and up-date-date resource for the design, construction, and operation of marsh treatment systems. This new edition represents a complete rewrite of the surface flow sections of previous editions of Treatment Wetlands. It is based on the performance hundreds of treatment marshes over the past 40 years. Treatment Marshes focuses on urban and agricultural runoff, river and lake water improvement, and highly treated municipal effluents. New information from the past dozen years is used to improve data interpretation and design concepts. Topics included in this book are Diversity of marsh vegetation Analyses of the human use of treatment marshes New concepts of underground processes and functions Spectrum of marsh values spanning mitigation, restoration, enhancement, and water quality improvement Improved methods for calculation of evapotranspiration and wetland water temperatures Hydraulics of surface and subsurface flows in marshes Analysis of long track records for deterministic and probabilistic behavior Consideration of integrated microbial and vegetative contaminant removals via mass balances Uptake and emission of gases Performance of urban and agricultural wetlands Design procedures for urban and agricultural wetlands Reduction of trace metals, pesticides, pharmaceuticals, endocrine disruptors, and trace organics Updated capital and O&M economics, and valuation of ancillary benefits An updated list of over 1900 references
Newman presents the story of author Lillian Hellman's intense relationship with Foreign Service officer John Melby--a relationship which cost Melby his job in a case of "guilt by association". Illustrations.
Written by leading thinkers in the field, this text provides an in-depth analysis of the economic and policy issues associated with individual and population aging. The text has a strong policy focus based on demographic and economic analysis, making this book both accessible and challenging to readers with limited mathematical background. Written by leading thinkers in the field of the economics of aging. Employs a strong policy focus based on demographic and economic analysis. Provides a comprehensive international picture of the consequences of aging. Engages the reader through side boxes, relevant website addresses, and practice questions.
In 1807, a year after Lewis and Clark returned from the shores of the Pacific, groups of trappers and hunters began to drift West to tap the rich stocks of beaver and to trade with the Native nations. Colorful and eccentric, bold and adventurous, mountain men such as John Colter, George Drouillard, Hugh Glass, Andrew Henry, and Kit Carson found individual freedom and financial reward in pursuit of pelts. Their knowledge of the country and its inhabitants served the first mapmakers, the army, and the streams of emigrants moving West in ever-greater numbers. The mountain men laid the foundations for their own displacement, as they led the nation on a westward course that ultimately spread the American lands from sea to sea.
In this volume, the authors present an original ethnographic study of five llama herding communities in Ayacucho, Peru. Data on herd dynamics are subjected to computer modeling in an effort to evaluate the roles of biology, symbolic and ritual behavior, ecological adaptation, and practical reason. The book contains the most detailed study of the waytakuy llama marking ceremony yet available. The role of this ceremony in preventing herds from going to extinction is evaluated against anthropological and sociobiological theory. This is an interdisciplinary book will appeal to professional archaeologists, prehistorians, cultural anthropologists, Andeanists, theoretical biologists, evolutionary biologists, and zoologists interested in animal domestication.
No experience needed...Jump right into Microsoft(R) Office XP Get started NOW! Prepare for Microsoft(R) Office XP Certification! Highly visual, step-by-step instruction makes LEARNing Office XP easy! *Each step has an accompanying screen so each task is illustrated for you to follow. *Cautions, Quick Tips, and In-Depths show you where the pitfalls are and how to avoid them. *4 different levels of exercises in each chapter provide the ultimate practice experience. www prenhall.com/preston Your on-line resource for learning Office XP * Interactive Study Guides! * Data Files! * On-line Exercises!
When the Lewis and Clark Expedition crossed a continent in 1803 to 1806, they started out in U.S. Army uniforms, which gradually had to be replaced with simple leather garments. For parts of those uniforms, only a single drawing, pattern, or example survives. Historian Moore and artist Haynes have researched archives and museums to locate and verify what the men wore, and Haynes has painted and sketched the clothing in scenes of the trip. Also included are Indian styles the men adopted, and the wardrobes of the Creole interpreters and the French boatmen. Weapons and accessories round out this complete record of what the expedition wore or carried--and why. A great reference for artists, living history performers, museums, and military historians.
Encourage students to take an in-depth view of the people and events of specific eras of American history. Nonfiction reading comprehension is emphasized along with research, writing, critical thinking, working with maps, and more. Most titles include a Readers Theater.
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