I received a gift of a perforated ring dial recently. Like most mass-produced dials, it isn't set up for my latitude. I've tried to find info on these dials, but I only see a section in "Sundials: Theory and Construction" talking about ones with a fixed perforation. My Google-fu has failed me in locating info on the construction of dials with movable perforations (like mine).
My goal is 2-fold: better general understanding of this type of dial, and making alterations to correct this dial for other latitudes. (I do have a preliminary correction based on the references I do have, but if I can roll in the variable perforation location, I can make it more general. Any good pointers? -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * Keith E. Brandt, WD9GET wd9...@amsat.org <wd9...@amsat.org>* 'Christianity and science are opposed…but only in the same sense as my thumb and forefinger are opposed - and between them I can grasp everything.' —Sir William Bragg (Nobel Prize for Physics- 1915) *This message transmitted with 100% recycled electrons *xb*
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