Years back, a chapter of RASC got a donation from the estate of Heinz Lorenz, a well-off industrialist who had his own observatory, the Innisfil Observatory. Sadly, the structure was abandoned and later demolished after falling into disrepair.
http://urbexbarrie.blogspot.ca/2012/03/innisfil-observatory.html
The main mirror plus the motorized secondary support, spider and focuser survived. No secondary mirror though
Its main disadvantage is a fairly small field of view before coma becomes a problem. The primary has a figure that is only 70% as deep as a parabolic mirror for a Newtonian. A field corrector can fix this quite readily and is less of a concern now.
Anyway, the mirror got shipped around the a few other RASC center like Edmonton and then Okanagan. They decided it was too much work to get this modified to a Newtonian so they passed it on
The secondary mechanism was in really good shape and showed professional grade workmanship. The stalk was bored from a solid piece of Invar ™ a proprietary alloy that has very low coefficient of expansion, meaning the mirrors focus will no change with temperature. The secondary mount tilts but does not shift laterally, confirming it is a DK telescope. More on this later. The design included two switches which cut power to the motor if it moves too far from its range, about 1.5 inches. This range allows you to get enough back focus for adding various accessories like cameras, photometers or possibly even a spectrograph. The telescope was part of a group doing research and a 24 inch scope could do that.
The construction of the scope et al was done by defunct maker, Group 128, well know in professional circles. The main mirror is heavy at 24 inches in diameter and some 4 inches thick and made of Zerodur, a premium mirror substrate.
There are some peculiarities in a DK telescope. For those who don`t know, a Dall-Kirkham is one type of Cassegrain telescopes. The primary is elliptical, that is to say it is deeper than a spherical mirror but not AS deep as a parabolic one. The secondary is a convex spherical mirror. This does allow ease of alignment as the secondary only has to be adjusted for tilt, not centering