Show A MEAN TIME SUNDIAL an I 1 astri luent I 1 alint lint makes I 1 it own ir cr rr for tho the UI equation nation of time most P persons know that an ordinary sun sum dekl dom doca not give clock time E the dial tinie Is fast ast and sometimes it 1 is slow as compared with clock time lor for sundial lays days are not lilo like ordinary days all of cf lual cual ath length the ho acan timo time shown by 0 ord r binary I 1 nary clocks clock ii is baiel upon tho the division of a mean mclin day v hichi coric corresponds to the mean ieng langeli if of the day its measured ensured ni by the sundial at different parts of tile ye year r tho the clock time e dial time which would ie 1 e shown by a rc fc tit titi ions or mein mean sun still moving uniformly fit n the equator tit lit thoraine tho saine average rate a na z that of the reli re LI sun eun iu in the ecliptic 0 ME MEAN A 1 contriving a dial to chow tho the mom meau timo tholo las has it is told in the diioro logical review been overcome in fit a 0 manner by major general J T it II oliver of ondon I who has devised it gnomon which practically dinkes its own correction for the equation of time in this instrument t the ol 01 tin time 1 e ft s I 1 1 I catch not by thos alio lindow ov of it 11 strai hl raight g ht edle edge ia 18 in the old sundials adt by tho the point where nn fill equatorial circular line is i cut by tle edge of the shadow of a curved surface Mir face the cum atura of which I 1 is so arranged with mth to tho the suns distance s above or below the equator na to com coin for the equation of time the instrument is it unit ei al one and consists oan of 11 semicircle the diameter of which I 1 is tin antia carrying the curved TIO no mon and ii equatorial qua lori 1 l circular arm arc the latter lins hit upon its concato bur facek graduated line on oil which are mat mai ked the hours hour gand anil their there is ii a screw for clani clam plug ping the tha are am nt fit tile the proper position for tiny any gh K en latitude and another clamp for adjusting tile the equatorial are tle dial not only indicates local mean time limo but by it very simple elmila adjustment j may inay bs be set hot KO as to show any required Etan tiina the figure here given illustrates the dial devised by major oliver |