> John, > > there are two different kinds of stained glass sundials possible: > > 1. the sundial is made in the stained glass itself and there is a > style/gnomon on the outside. You can read this one from the outside or from > the inside if the window is translucent enough to disguish yhe shadow from > the inside. > > 2. the pattern is in the stained glass. That pattern is projected on the > floor where you can read the time & dateon the floor by using a fixed > reading point on the floor. There is no style/gnomon on the outside or > anywhere else, so that can not be broken. > > I guess you are looking for the type1 dial, but you might consider type2. > > Thibaud
I think there is another option. You can built a bifilar sundial with a negative thread. The negative thread is behind the dial so that it is inside and may be drawen on the wall or on the floor. The outside thread casts a shadow through the stained glass and the shadow will cross the negative thread in a point : the knot. The stained glass will be casted too and the hour will be shown by the knot on this projected dial. The negative thread may be hanging too, in this case the knot will be the cross of the shadows of the 2 threads. With these bifilar dials the stained glass may correspond to a dial with a different declination regards to the wall or may be like an equinoctial dial. The bifilar dial may also have both the threads negative. I have drawen some of these bifilar dials last year on the italian mail-list. If someone is interested on them I can put the pictures on my website or send them by e-mail. I have no news about bifilar realized with negative thread. ciao Fabio Savian -
