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That surprised me as well being Trico but 47 taxi wiring diagram show it as electric. On the Finnish website, there is also a fair photo of the mechanism showing wires going into the motor.

There are couple of rear window operating switches for sale in eBay:

http://www.ebay.com/itm/1947-1948-1949-1950-Packard-taxi-rear-window-switches-/230816708431

At least the window is electrically controlled. Too bad the Finnish car is very far away from my place. I could go and check it out...

Owen_Dyneto: Thank you. I will be waiting for it. I did scan the wood gas Packard today. I should be able to post it later today.

The window operating Trico unit is like a large vaccuum windshield wiper unit. It has two electric solinoids that are operated by a switch on the dash. The switch energizes one of the solinoids to direct the flow of vaccuum inside of the unit to one side of the paddle or the other. Hope this helps. Packardtaximan

Thanks for the explanation, now it makes complete sense.

I did just receive permission to use the copyrighted photos I mentioned earlier; they really don't add anything to what we now know but as long as I bothered, here they are. Sorry for the moire, I need to learn how to minimize or eliminate that.

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When you say paddles, is it like a rotary vane or air tool motor and the shaft just turns or does it do something else? Would you have any more pictures of the drive detail showing what the shaft end(s) actually do to those long bars. I'm curious what that mechanism is over on the left side end of long shaft.

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I have one of the units apart and will post some pictures tomorrow.

I hope these pictures are helpful. The two problems I have had with these units are there is a double rubber seal sandwiched in the paddle so it can seal both directions shrinks and dries out so it no longer makes a good seal. The other problem is non operating electric solenoid. Neither of these problems are serviceable to my knowledge and parts are non existent. Packardtaximan

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Thanks for posting the pictures. Most interesting. Can you elaborate more on how that apparently small rotary paddle motion is used to raise the window so high? Ratchet -- or is it levers and done in one sweep?

On the rubber seal, is it a flat one piece affair sandwiched between the halves or just a strip around the edge. What about making a mold and using some medium shore casting urethane to make a one piece or if a strip, some O ring cord stock in maybe square or V shape.

It is done by lever action. The length of the arms at each end of the shaft and the position on the window where they attach determine how far the window opens. The rubber seal appears to be two separate pieces, but could be one piece that is split at the point of contact. There is also a spring at each end of the shaft to assist the paddle. The engineering has me baffled as how the springs assist one direction and does not resist the other direction. I'll let the engineers keep that secret. Packardtaximan

Maybe the springs are assisting in both directions helping the glass up and keeping it from dropping down -- somewhat like the counterweight spring in the door window works.

At any rate, to lift the heavy glass with the relatively small paddle leveraged like it is, I'm starting to have a lot of respect for air power -- or the lack thereof.