Dear Angelo, Thank you very much for these references! The complex structure shown appears to include all the movement changes to effect the compensations with minimum translation ( unrotated movement such as sliding along a plane) It appears to me that the compensations can be done with simpler structures if a fair amount of resultant (net) translation of the entire dial is also allowable. Am I wrong?
Edley McKnight [43.126N 123.357W] > Dear Edley > The project with technical details for an armilla which can be rotated > around the gnomon to take into account longitude and Equation of Time is > shown in: http://www.angelfire.com/ca2/tech3d/images/sundial01.pdf > http://www.angelfire.com/ca2/tech3d/images/sundial02.pdf > http://www.angelfire.com/ca2/tech3d/images/sundial03.pdf > > Regards > Angelo > > At 11.50 18/12/01 -0800, you wrote: > >Dear Membership, > > > >In some current sundial projects the ability to correct for > >Longitude, Equation of Time and Daylight Savings Time had to be > >incorporated. In some of these the idea of rotating the dial about > >the gnomon axis would work but others were too cumbersome to even > >contemplate doing this. Some thought led to the concept that any > >dial can be compensated/corrected by rotating it around Any axis > >parallel to the gnomon!! Since rotation about the actual earth's > >axis works and also around the gnomon axis, this should work. Trial on a > >few models shows that it works. Of course you all probably know this > >already, but the idea was new to me. In one model I tilted the pedestal > >at it's base the required degree about an axis, in another I shimmed up > >the dial plate on one edge, another works well with a hinge. What a > >joyful degree of freedom! > > > >Enjoy the Light! > > > >Edley McKnight > > > >[43.126N 123.357W] > > -- > Angelo Brazzi 44 32' 10''N 11 32' 15''E > mailto:[EMAIL PROTECTED] > http://web.tiscali.it/partena/index.htm >
