A few months ago I had seen a thing for a clock with a smith chart as it’s clock face which I searched and can’t seem to find a link for that. Regardless, I have a cheap black wall clock that I picked up while cleaning up my room and thought that the clock face looked to be about the right size for a printed out smith chat, and I was right:
So I took a screw driver and pushed in two tabs on the back of the clock that hold in the clear plastic over the face of the clock, and removed the clear face:
Next I wanted to get the paper clock face out to use as a cutting guide on the smith chart, so I cut from the edge to the center hole so I could remove the face without trying to remove (and likely break) the hands of the clock:

Next, I took out the paper face, and aligned that on the smith chart so the smith chart would be more or less centered (with a perfect match at the axle of the clock arms!). I put tape on the edge of the clock face so it wouldn’t shift from the position I centered it on:
Then I cut out the circle on the smith chart around the edge of the clock face — the cutout needs to be the same size or smaller than the clock face or it won’t fit in the clock:

Then I cut out the circle in the center of the chart (shown started above) and cut a line from the outside of the smith chart to the center, again, so I can get it on past the arms of the clock. In retrospect, I could have cut a small line out from the center as long as the back end of the seconds hand, and then put the long end of the arms through the hold and then slide this slit down over the longer back of the seconds hand, thus avoiding cutting a line from edge to center, so if you are doing this, i recommend not cutting all the way from the edge.

I then put the smith chart in on top of the old clock face, and lined up the real impedance line (the horizontal line on the chart) with the 3 and the 9, so that a perfect short is 9 o’clock and a perfect open is 3 o’clock. I taped it down on the back side in a number of places to hold it snug to the clock face, to avoid it shifting around. I debated putting an extra circle in between the clock face and the smith chart to make sure the numbers don’t bleed through — they don’t unless under strong light, so I don’t think it’s necessary.

Here is the finished product!
So now, 12 is at Z = j, 6 is at Z = -j, and so forth. I am debating putting the clock numbers on this, but so far I am thinking I like it the way it is. I can now tell time in either standard, military, or impedance.

Some facts:
-the seconds hand traces out a circle at the tip that has a VSWR of about 12, the hour hand a VSWR of 2.8, and the minute hand VSWR = 9 or so.
- Between 3 and 9 o’clock each day, the hour is capacitive, while between 9 and 3 o’clock the hour is inductive. The minute hand, obviously, spends half of the hour between 15 after and 45 as capacitive, and the rest of the time the minutes are inductive.
- At any given hour (and impedance), moving 6 hours around the clock gives the admittance of the impedance. Same with the minute hand, only moving 30 minutes around the clock instead.
-9 o’clock is a voltage minimum, whereas 3 o’clock is a voltage maximum..

,,,I could go on, but I think I beat that one to death. Make your own smith chart clock!