wb9k
10 kW
I picked up this cool old battery at an antique mall a year or so ago:

This link dates the item to the 1890's: http://reference.insulators.info/publications/view/?id=12185
The lid of the glass jar is a carbon cylinder that reaches down into the jar. Suspended from the carbon is a zinc rod that also extends into the jar. The paper label on the jar has instructions for setting the battery up: fill the jar half full with water and mix in 5 oz of sal ammoniac, known today as ammonium chloride (NH4Cl). I always thought it would be fun to try and make this thing go again. It turns out you can get ammonium chloride readily, I got a pound of it for $13 on Amazon. With the holidays, I've finally had time to give it a try...and it works! The cell makes about 1.4 Volts max and I have measure blips of current as high as 2 Amps into a dead short. Contrast that to the steady 6 Amps I was able to get from the Eveready NiMH AA cell that was powering the clock before.I haven't established a constant current capability for the Laclede cell.
Finding a device that can run on just over a Volt does not leave a lot of choices. I decided the desk clock at my ham radio setup would be a good choice since this is where I keep the battery and I can leave the setup undisturbed indefinitely, giving me a chance to see how long this thing will go. It's working, we'll see how long:

You can see a slideshow with additional photos here:
http://s935.photobucket.com/user/mollysplayhouse/slideshow/Laclede%20cell?sort=6
Cheers!

This link dates the item to the 1890's: http://reference.insulators.info/publications/view/?id=12185
The lid of the glass jar is a carbon cylinder that reaches down into the jar. Suspended from the carbon is a zinc rod that also extends into the jar. The paper label on the jar has instructions for setting the battery up: fill the jar half full with water and mix in 5 oz of sal ammoniac, known today as ammonium chloride (NH4Cl). I always thought it would be fun to try and make this thing go again. It turns out you can get ammonium chloride readily, I got a pound of it for $13 on Amazon. With the holidays, I've finally had time to give it a try...and it works! The cell makes about 1.4 Volts max and I have measure blips of current as high as 2 Amps into a dead short. Contrast that to the steady 6 Amps I was able to get from the Eveready NiMH AA cell that was powering the clock before.I haven't established a constant current capability for the Laclede cell.
Finding a device that can run on just over a Volt does not leave a lot of choices. I decided the desk clock at my ham radio setup would be a good choice since this is where I keep the battery and I can leave the setup undisturbed indefinitely, giving me a chance to see how long this thing will go. It's working, we'll see how long:

You can see a slideshow with additional photos here:
http://s935.photobucket.com/user/mollysplayhouse/slideshow/Laclede%20cell?sort=6
Cheers!