Prism and Lens Making: A Textbook for Optical Glassworkers, Second Edition is a unique compendium of the art and science of the optical working of glass for the production of mirrors, lenses, and prisms. Incorporating minor corrections and a foreword by Professor Walter Welford FRS, this reissue of the 1957 edition provides a wealth of technical information and hands-on guidance gained from a lifetime of experience. Although some of the techniques have been replaced by more modern methods, this classic book is still a valuable source of practical assistance as well as being a pleasure to read.
It has been said that everyone has a double. But what if the other person is not just a look-alike? David Smith is a simple man who lives a very ordinary life. When a national news story on the TV and radio from the other side of the world shows David to be more than he seems, his family and girlfriend need to be convinced that this cannot be their David. Even his best friend Zackary Eaglestone has no answer to this doppelgänger, yet promises to discover the truth behind this fraudster. Following the pre-war discovery of an ancient gateway, the secrets hidden within the light of a crystal prism holds the answers to every question mankind has ever asked. Everyone has a double. When the man in the mirror is seen on your side of the glass which is the true reflection? David Smith is about to find out.
In Spymaster’s Prism the legendary former spymaster Jack Devine details the unending struggle with Russia and its intelligence agencies as it works against our national security. Devine tells this story through the unique perspective of a seasoned CIA professional who served more than three decades, some at the highest levels of the agency. He uses his gimlet-eyed view to walk us through the fascinating spy cases and covert action activities of Russia, not only through the Cold War past but up to and including its interference in the Trump era. Devine also looks over the horizon to see what lies ahead in this struggle and provides prescriptions for the future. Based on personal experience and exhaustive research, Devine builds a vivid and complex mosaic that illustrates how Russia’s intelligence activities have continued uninterrupted throughout modern history, using fundamentally identical policies and techniques to undermine our democracy. He shows in stark terms how intelligence has been modernized and weaponized through the power of the cyber world. Devine presents his analysis using clear-eyed vision and a repertoire of better-than-fiction spy stories, giving us an objective, riveting, and candid take on U.S.-Russia relations. He offers key lessons from our intelligence successes and failures over the past seventy-five years that will help us determine how to address our current strategic shortfall, emerge ahead of the Russians, and be prepared for what’s to come from any adversary.
In a world where magic is tightly controlled, the most powerful man in history must choose between his kingdom and his son in the first book in the epic NYT bestselling Lightbringer series. Guile is the Prism. He is high priest and emperor, a man whose power, wit, and charm are all that preserves a tenuous peace. Yet Prisms never last, and Guile knows exactly how long he has left to live. When Guile discovers he has a son, born in a far kingdom after the war that put him in power, he must decide how much he's willing to pay to protect a secret that could tear his world apart. If you loved the action and adventure of the Night Angel trilogy, you will devour this incredible epic fantasy series by Brent Weeks.
Prism and Lens Making: A Textbook for Optical Glassworkers, Second Edition is a unique compendium of the art and science of the optical working of glass for the production of mirrors, lenses, and prisms. Incorporating minor corrections and a foreword by Professor Walter Welford FRS, this reissue of the 1957 edition provides a wealth of technical information and hands-on guidance gained from a lifetime of experience. Although some of the techniques have been replaced by more modern methods, this classic book is still a valuable source of practical assistance as well as being a pleasure to read. About the Author Frank Twyman was a skilled craftsman in all aspects of optics. He joined Otto Hilger in 1898 to work on the production of simple spectroscopes costing less than £10 each. After the death of Otto Hilger, Twyman became Managing Director of Adam Hilger Ltd., a company known for the finest quality optical and mechanical work. He worked here from 1902 to 1946 and was very concerned with the practical aspects of instrument making; he designed many of the instruments himself and constantly strove to improve the techniques of optical grinding and polishing. In 1916 Twyman and Alfred Green, the foreman of the Hilger optical shops, patented the now-famous prism and lens testing interferometer that bears their names. Twyman also undertook fundamental studies in the annealing process for glass and invented new spectrophotometers and spectrographs.
Contains easy-to-follow three-part daily lesson plans. This assists teachers in focusing on lesson objectives, providing ongoing practice for all students and addressing individual student needs for a variety of populations. A unit organizer provides learning goals, planning and assessment support, content highlights, a materials chart, suggestions for problem-solving, cross-curricular links, and options for individualizing. Each guide is grade level-specific.
Help your students master math skills with this leveled text set on 3-D shapes! Texts are written at four levels to differentiate instruction. Provided comprehension questions complement the texts.
