| Description |
xii, 228 pages : illustrations ; 22 cm |
| Contents |
1. Historical sketch -- 2. Kinds of time -- The sun's apparent motion -- Differences in longitude -- Local apparent time -- Local mean time -- The equation of time -- Converting from apparent to mean time -- Standard time -- Longitude corrections -- Converstions from standard time to local apparent time -- Time when the sun souths -- Daylight saving time -- 3. The noon mark -- Finding the meridian -- The analemma -- Finding the analemma by computation -- 4. The equatorial sundial -- Showing standard time -- 5. The horizontal sundial -- General appearance of horizontal dial -- The latitude -- Laying out the hour lines graphically -- Laying out the hour lines in a unit square -- Laying out the hour lines with tabulated angles -- Laying out the hour lines by computation -- Logitude correction for horizontal dials -- Adjustment to new lattitudes -- Limiting hour lines -- 6. Vertical direct south dials -- 7. The Vertical direct north dial -- 8. Vertical direct east and west dials -- Direct east and west dials by calculation -- 9. The polar dial -- Graphic construction -- Construction by calculation -- 10. Vertical declining dials -- Graphical method -- The computational method -- What hour lines include -- Vertical north decliners -- Limiting hours on north decliners -- Measuring a Wall's declination -- An alternative method of finding a Wall's declination -- Dials with large declination -- 11. Direct reclining or inclining dials -- Direct south or north recliners or incliners -- Direct east or west recliners and incliners -- 12. Dials which both decline and recline -- 13. The analemmatic dial -- Laying out the hour points -- Finding the hour points from central angles -- General observations -- 14. Reflected ceiling dials -- Drawing hour lines by observation -- Drawing the dial by computation -- 15. Dial furniture -- Dial mottoes -- The equation of time -- Showing time in other cities -- The nodus and the perpendicular style -- The sun's azimuth -- The sun's altitude -- Lines of declination -- The use of tables -- Graphic approach -- Vertical direct south dials -- Polar dials and vertical direct east or west dials -- Lines of declination: vertical declining dials -- The length of day -- Signs of the zodiac -- 16. Portable dials -- The shepherd's dial -- Graphic approach -- Arithmetic approach -- Tablet dials -- Cubic dials -- Portable cross dials -- Pocker equatorial dials -- The universal ring dial -- Perforated ring dials -- The sun watch -- The Capuchin dial -- A very early portable dial -- Time-telling at night -- Time by moonlight -- The nocturnal -- 17. The armillary sphere -- Methods of measurement -- Laying out the rings -- The sun's declination -- 18. Memorial dials -- Headstone with sloping surface -- The cross dial -- Star of David dials -- 19. Practical hints on dialling -- Laying out an ellipse -- Setting the dial in place -- Finding lattitude and longitude -- Appendix -- Table A.1. The equation of time -- Table A.2. Declinations of the sun -- Table A.3. The zodiac -- Table A.4. Conversion of the arc to time -- Table A.5. Conversion of time to arc -- Table A.6. Latitudes, longitudes and standard time zones -- Table A.7. Earliest sunrise and latest sunset -- Table A.8. Sunset times at various latitudes and seasons -- Table A.9. Data for laying out dials in a unit square -- Table A.10. Hour angles for hotizontal and vertical direct south dials -- Table A.11. Factor table for reflected ceiling dials -- Table A.12. Factor table for finding distances of hour lines from the equinoctial on reflected ceiling dials -- Bibliography -- Index |
| Summary |
Have you ever wanted to build a sundial or to understand how on works? Then you have probably been frustrated as you searched vainly for help. Most books on the subject are either rare out-of-print works published centuries ago and available only in highly specialized collections, or higly complicated treatises whose information is hidden behind frightening arrays of involved formulas. But now your search is over. This book is designed to meet sundialing needs at either the simple or the sophisticated level. Albert E. Waugh, for 40 years prodessor and administrator at the University of Connectiut, is an expert on the subject of sundials and their curious history. On the one hand he presents a rigorous appraisal of the science of sundials, including the mathematical treatment and an explanation of the pertinent astronomical background; on the other hand, he presents simple and non-technical treatments such that several of the dials can be built by children. The subject matter is arranged in 19 chapters, each covering a different aspect of dialling science. All the common types of dials are covered, but the reader can also learn about analemmatic dials, polar dials, equatorial dials, portable dials, memorial dials, armillary spheres, reflected ceiling dials, cross dials and old-fashioned noo makrs. THere are also sections on dial furniture, mottoes, the actual laying out of a dial, the equation of time, finding time in other cities, how to find the meridian, how to find time by moonlight - even how to estimate time from the length for the length of one's own shadow! Directions are given for designing dials for any part of the country, or any place in the world. The author has designed many dials, and his text is filled with helpful hints based on his own personal experience. There are over 100 illustrations, charts and tables, followed by an appendix which is filled with material which reduces or eliminates the need for calculation on the part of the reader. (Back cover) |
| Analysis |
Sundials Making |
| Notes |
Bibliography: p.225-226. _ Includes index |
| Bibliography |
Bibliography: pages [225]-226 |
| Subject |
Sundials.
|
| LC no. |
73076961 |
| ISBN |
0486229475 (paperback) |
|
9780486229478 (paperback) |
|
