Dialling, plain, concave, convex, projective, reflective, refractive. Shewing, how to make all such dials, and to adorn them with all useful furniture relating to the course of the sun; performed arithmetically, geometrically, instrumentally and mechanically: and illustrated with sculptures, engraven in copper, comprised in XIV distinct tractates... / [William Leybourn].

  • Leybourn, William, 1626-1716.
Date:
1700
Catalogue details

Licence: Public Domain Mark

Credit: Dialling, plain, concave, convex, projective, reflective, refractive. Shewing, how to make all such dials, and to adorn them with all useful furniture relating to the course of the sun; performed arithmetically, geometrically, instrumentally and mechanically: and illustrated with sculptures, engraven in copper, comprised in XIV distinct tractates... / [William Leybourn]. Source: Wellcome Collection.

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    —2 TOT H E Any of the following Mifcellaniom TraBates lying obfcnrely and indigefted by me feveral Years, at 'length , namely^ Anno 1678. having fome vacant time, I (amongft other things) took thofe Papers into my con- fideration , and perfected fuch of them as were incomplete; adding.to that Store other things of the like nature: After which , communicating the fame to feveral perfons Mathe¬ matically alfefied , and more particularly with this (lauda¬ ble and ufeful) Part thereof, namely, DIALLING: I was often-times importuned to make the fame Publick ; the which I was the more inclinable to, for that not much of this Fjr/Vtj hath been hitherto Publifhed in the Englifli Tongue. But finding the Overtures of fuch who deal in the Publifliing of Books , to be in no meafure fufficient, either to fatisfie me for'the pains I had then taken therein, much lefs to bring it forth in its due Luftre; I (at length) adventu¬ red to makeaiiEfiay towards the PublilHing thereof by w^ay of Subfcription, but finding that not to anfwer my expedati- on neither f there having been of late fo many abufes put upon Perfons, willing to promote ingenious undertakings) I fully refolved to let it lie dormant, as (the more part of) it had done feveral years before. But at length, (partly by Sub- fcriptions, and a particular Encourager) it is arrived to this pcrfediofij arid an Extradofthe Particulars herein contain¬ ed, you (hall find immediatly after this Preface. And now give me leave to prevent the Calumnies of fome (already) Detraders, and to take off the afperfion of a Plagia¬ ry, to acquaint thee from wheilce all that is herein contained had its iilue. Therefore. I. The Introduction^ and the Eight firft Chapters of the firft Tractate , as things common, (but necelfary for all Tyro\ to be acquainted with) I pafs over, only take notice, that the Second, Fourth and Filth Chapters thereof^ which concerns A ' the