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About Pocket-Watch Slide Rules
Product Description This book is about one of the most attractive and tactile forms of slide rules, the pocket-watch slide rule. Although pocket-watch slide rules were not the most accurate nor easiest to use, these delightful devices were featured in makers catalogues from all parts of the world for the last century of the slide rule s life. Pocket-watch slide rules are an exquisite example of the slide rule makers art and are perhaps the most collectible type of slide rules. The Book Includes: -Descriptions of over 150 pocket-watch slide rules and variants -Full-color illustrations, detailed descriptions, and dating information -Approximately 80 makers and retailers from the UK, Europe, and the USA -Descriptions of special scales used -Coverage of seminal patents -A glossary of terms -A comprehensive bibliography Review A slide rule is tactile no more so than the prized pocket-watch type. They are gems of engineering but also controversial. When does a pocket-watch slide rule become a circular slide rule? Consequently authors of related reference books have skirted round the topic. Not this time. After settling, once and for all, what is a pocket-watch slide rule Hopp goes on to describe and date over 150 different mouth-watering examples. For lovers of pocket watches or slide rules this richly illustrated book is a must. --David G Rance member of the Dutch Circle for Historical Calculating Instruments (KRING) Sassenheim, The Netherlands It's good news to learn that Peter Hopp will publish a book on pocket-watch slide rules. Having some of these devices in my collection, I'm looking forward to participate from his expertise gained in many years of collecting and researching. As Peter Hopp already published his landmark reference book on slide rules at Astragal Press some years ago, I'm truly convinced that he again will be successful in satisfying the readers' expectations. --Peter Holland, Germany Peter Hopp needs no introduction to slide rule collectors throughout the world. He has been a member of the Oughtred Society of the United States since the early years of its inception in 1991 and is a founding member of the UK Slide Rule Circle (UKSRC). He is co-editor of the UKSRC s annual Gazette and has published many articles in this and the Oughtred Society Journal over the past twenty years enthusiastically sharing his knowledge with others. His first book Slide Rules their History, Models and Makers, published in 1999, has become the point of first reference for all slide rule collectors. This work was followed by a detailed study of joint slide rules in his book Joint Slide Rules Sectors, 2-foot 2-fold and slide rules, published in 2009. Drawing on his years of slide rule collecting experience we now we have Hopp s latest extensively researched book Pocket-Watch Slide Rules illustrating with images and patent information these delightful instruments through the ages. Starting with an analysis of the various types of pocket-watch slide rules, an historical review of the oldest types and patents, the book continues with a review of worldwide manufacture. A comprehensive survey of pocket-watch slide rules is given by family sub-divided with relevant detailed information including some unidentified examples and examples known to exist but as yet undiscovered. The latter part of the book deals with non-mathematical types of pocket-watch calculators and wrist-watch slide rules. Finally the book contains a list of known worldwide manufacturers and retailers and an appendix with operating instructions and hints on identifying makers of unmarked versions. In its non-technical style and logical layout, both the casual collector and the connoisseur will find information and delight in this book covering, as it does, aspects of design and construction from the earliest known examples to the demise of the slide rule in general use. --Colin Barnes, Editor: Skid Stick (UKSRC newsletter), Co-editor: Slide Rule Gazette, UK About
