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Posthuma Fosteri: The Description Of A Ruler (1652) By Samuel Foster
Paperback: $18.00
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This book was published posthumously in the year that Foster died. It describes a ruler with 9 scales and gives instructions on how to use the scales to solve many of the standard problems of... More > “astronomie, navigation, and dialling”. In addition to familiar trigonometric scales, the ruler includes two new scales introduced by Foster. The first provides an easy means of laying out horizontal sundials between 30º and 60º of latitude without having to draw any auxiliary lines. The second is a true Foster innovation: with this scale and a chord scale, Foster is able to find all the elements needed to draw a sundial on an arbitrary plane. He also uses these scales to replace the usual dialing scales (also a Foster invention), laying out a sundial from equispaced points on the circumference of a circle. One page of the current edition includes a redrawn version of the ruler that the reader can use in conjunction with the text.< Less
Elliptical, Or Azimuthal Horologiography (1654) By Samuel Foster
Paperback: $25.00
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This brilliant work, far ahead of its time, details Foster’s development of analemmatic, circular, and diametral sundials and their generalizations. (The title appeared earlier in compressed... More > format as part of The Analemmatic Sundial Sourcebook – it is available here as a separate volume.) Its four sections are: Elliptical, Or Azimuthal Horologiography; Circular Horologiography; Rectilineal Or Diametral Horologiography; Elliptical Horologiography. It was prepared for the press by Edmund Wingate and John Twysden two years after Foster’s death.< Less
The Art Of Dialling (1638) By Samuel Foster
Paperback: $18.00
Prints in 3-5 business days
Samuel Foster’s The Art of Dialling is particularly noteworthy for two reasons. First, it contains the first appearance of dialing scales. For over two centuries following Foster, the latitude... More > and hour scales he introduces in this book were recognized as providing the simplest means for laying out hour lines. Although George Serle was probably the first to put the scales on a ruler, he himself clearly attributes their invention to Foster. Second, it includes an interesting approach to drawing a dial on an arbitrary plane: Foster demonstrates how any plane can be treated as though it were the special case of a direct east - west plane, and then he completely solves the special case. This book consists of a facsimile reprint of the 1638 edition of The Art of Dialling. It also includes the full text of the 1675 edition produced by Leybourn and a paragraph by paragraph comparison of the two.< Less

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