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The Harmolin, how it works...
The harmolin, like the autoharp, plays chords by means of allowing one to play only selected strings at will, namely those which are tuned to the notes of the desired chord. The means by which it accomplishes this is altogether different from that employed by the autoharp. In my opinion, both are altogether ingenious and successful contraptions.
I should point out that some of my photos came out less than great, so I had to do some "doctoring" on them. It is very obvious and not at all artfully done, but it provides simulated visibility that better answers to this page's goal than would have the unaltered images. That said, let's have a look at the harmolin.
metal grate attachment
In the first photo, the metal grate is in playing position, resting on top of the instrument. The instrument itself is to be on a table, lap, or other horizontal surface. This metal grate is removable, and also adjustable, as you will see. The 15 slots in the grate each represent a chord. Also shown is the damper bar, which silences all the strings when pushed down. This is so you can silence a chord as you're changing to a different chord, so the two don't overlap and run together. The red arrow indicates the direction we're going to flip the grate for the second photo, in which the grate will be upside-down.
pin and notches in bottom of grate
Also shown (though obscured by the arrows) is one of the 4 side stops, which prevent the grate from moving left-to-right. There's one at each corner of the grate, and all 4 are pointed out in the previous image above.
bottom view of pick
side view of pick
Next, we are looking at the side view of the pick, from the wheel end of the arm. First, it is shown with the arm/wheel/plectrum down, in which position it would be plucking a string. In the second image, the arm/wheel/plectrum is retracted, in which position it would not be plucking any string. When the arm is in retracted position, the strings are out of the plectrum's reach.
end view of pick
Now we see the end view of the pick, again in both "engaged" and "retracted" positions. Here we get the end view of the casting ridge and the hinge pin for the arm.
side view of pick in action
But in the second image, the wheel falls into one of the rounded notches, and the arm is forced downward by the spring. This also lowers the plectrum, enabling it to now reach and thus pluck the string directly below this particular rounded notch in the rail. Incidentally, I raised the body of the pick up off the rail a little so you could see better how it works; it would normally be riding on the rail, as in the top photo.
end view of pick in action
And last, we have the end view of the pick in playing position.