The Inside Story
As I began the planning for this clock it was driven by the mechanical logistics. That sounds like a pretty heady term for a farm boy, self-made jack-of-all-trades, but I love pushing through problem-solving, based on common sense. You simply barge through problems until you find the answer! The times when I create/design the best are during the two hours (usually between 4-6 a.m.) before I get up. During the day I sketch whenever and wherever I can: in a doctor's office lobby rather than reading magazines, at a stop light, on a lazy Saturday evening with one eye on a Western movie. I am most happy with a scrap of paper and a sharp pencil. I must have OCD when it comes to sharp pencils with erasers. I know that I can burn an eraser off a new pencil in about one day. In the end, once the eraser is gone, especially if it's a short pencil—it's time for the round file.
Beginning the Plan
The first sketches I find in my journal were of the marble-release mechanism. I needed to be confident that this aspect could be accomplished. It HAD to work or there was no point in building the clock. Here is a look at that process. Even though I had the concept for that done first, it was reworked twice (2008 and 2011) before it was built. I actually finalized and successfully tested it for the first time in July of 2011.

From this original sketch (1996) the track is seen running top to bottom in this view. You can see the round marble indicated in the bottom area. The fish hook shaped piece is the gate and it blocks the marble until the chime action pushes the top of the hook to your right. That, in turn, drops the bottom of the hook into a slot which allows the marble to pass. This design proved to be unable to stop the marble which simply overpowered the chime hammer, opened the gate and plowed right on through to its heart's content! Of all the nerve!
The Completed Gate
In the end, the most problematic aspect was to get a "gate" that was easy enough to open and not hinder the clock chime hammer movement, and yet tough enough so that the marble did not knock the gate open as it came to an abrupt halt. The final gate of 2011 was the first one that achieved that.
It's hard to believe, but I made eight full "finished" models before I finally had success! In this final, tested fail-safe version, seen here,

the gate is operated by the connecting lever-action arm (upper right) to the clockworks. The marble has just come off the vertical conveyor belt and is in the gate ready for the next hourly chime action. You can see the brass rod (right in front of the marble) that is extended which holds the tiny gate door closed and blocks the marble. I built little "speed bumps" out of felt strips to slow the marble down and reduce the high impact hit off the gate. They are on top of the green felt track covering, but hard to see here. Also you see the peg on the left of the marble. That is there to create an exact, minimal channel width to snug it up to the release door on the opposite side of the marble.
In the last photo the rod is recessed (by the clock movement) and the tiny door is allowed to "open." With that action the marble is free to leave, and in doing so, begins its long descent down the track through the animal action stations. [P.S. for those of you finding this from the
How To section, go to: clocks, treehouse Marble label for the complete story.]