Inspired by actual WWII signal training cards, a double deck of playing cards and companion booklet highlight this handsome gift set. The 48-page illustrated booklet recounts the fascinating historical background of the signal flag, semaphore, phonetic alphabet, and Morse code systems featured in the decks. Packaged in a durable and attractive case, the set includes a recreated Morse code flasher device, a signal training indicator wheel, a full-color poster, and other items of historical interest.

Explores the decline of mechanical signalling in the UK.

Classic Railroad Signals digs into nearly every piece of train signaling hardware with archival and modern photos showing signals from around America.

An essential reader containing 19 important papers on the invention and early development of concurrent programming and its relevance to computer science and computer engineering. All of them are written by the pioneers in concurrent programming, including Brinch Hansen himself, and have introductions added that summarize the papers and put them in perspective. The editor provides an overview chapter and neatly places all developments in perspective with chapter introductions and expository apparatus. Essential resource for graduates, professionals, and researchers in CS with an interest in concurrent programming principles. A familiarity with operating system principles is assumed.

Excerpt from On the Fixed Signals of Railways The drawing is a sketch of the first signal erected, except that one arm only is shown in the drawing for the sake of greater clearness. At first the lamps, with red, green, and white lenses, were worked by a separate handle; but soon a pair of bevel-wheels were added, so that one handle worked both the blade and the l& also levers connected by rods were substituted for pulleys connected by wire ropes, and counterweights were added to make the signal self-acting to the position of danger. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

From the 1830s to today, the railroad industry has developed myriad complex mechanisms to help keep North America’s railroad rights-of-ways safe, efficient, and relatively accident-free. In this paperback rerelease of the successful 2003 title, the otherwise-arcane world of railroad signaling is explained in concise language and brought to life with nearly 200 fantastic photographs that depict signaling history and all aspects of modern operations. Author and photographer Brian Solomon brings his wealth of knowledge and photographic talent to a subject that has not often been tackled in book form, yet is integral to the American railroad experience.

A narrative history of the most iconic railway company of the great age of steam.

Flag semaphore is the telegraphy system conveying information at a distance by means of visual signals with hand-held flags. Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used in the 19th century.