. Sun dials and roses of yesterday; garden delights which are here displayed in every truth and are moreover regarded as emblems . ill like to construct one, but can-not understand the application of any rules such asthose of Leadbeater or Ferguson, I will give plainrules for making a horizontal dial, worded by H. , Esq., of Philadelphia, though he disclaimsall originality in their construction and seem to me perfect in their simplicity andexactness of information, and with the attached Fig-ures I, 2, and 3, must be readily understood; andwhen these are grasped, I am su
. Sun dials and roses of yesterday; garden delights which are here displayed in every truth and are moreover regarded as emblems . ill like to construct one, but can-not understand the application of any rules such asthose of Leadbeater or Ferguson, I will give plainrules for making a horizontal dial, worded by H. , Esq., of Philadelphia, though he disclaimsall originality in their construction and seem to me perfect in their simplicity andexactness of information, and with the attached Fig-ures I, 2, and 3, must be readily understood; andwhen these are grasped, I am sure the rules for ver-tical dials, given in the Encyclopedia Britannica^ willat once seem clear and applicable. The Construction of Sun-dials 95 Rules for making a Horizontal Dial To lay out the lines for a Horizontal Sun-dial in itssimplest form, we will first make the Stile or Gnomon. Figure I. Lay off thehorizontal base line, thenwith a Protractor ascer-tain the angle whichmust be the same as theLatitude of the place,say for New York it isabout 40° 44\ Start-ing from the point 5,mark the angle with aline BC^ and draw also. Figure 1. the perpendicular line JC at right angles to the base gives you the triangular Gnomon in its simplest form;they are generally cut away at the back in a fanciful out-line, as indicated by the dotted lines, always leaving theline BC untouched, for its line is the shadow line. Then the angle ABC will be correct for this Latitude. For the Face of the Dial draw the line JB^ and then theline CD, at right angles to AB. The points C and D willbe your six oclock points. At the intersection of these lines, E^ draw a circle, theradius of which will be equal to the length of the line BCin Figure i. Then another circle inside, the radius of which will beequal to the length of the line AB in Figure i. Now theoutside circle, J to D and A to C, divide in two equalparts, and then subdivide each of these parts into three, soas to make twelve equal parts, i
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsundial, bookyear1902
