This is a usage counter that works by moving mercury in a capillary tube via electrochemistry. As electricity flows through the device, mercury atoms are transferred across an electrolyte gap in the capillary. The position of the gap changes as mercury is transferred, and shows how much total charge has been passed through the device.
I realize that the divider network looks more like 20:1. This might kill my theory that the mercury ions are in the 2+ state. I'm really not sure.
- I previously worked on Virtual Reality and other hardware at Valve. I currently work at Google[x].
Prior to starting at Valve, I built computer peripherals such as keyboards, mice, and joysticks that were designed to be used inside MRI machines. My company, Mag Design and Engineering, sold these devices directly to researchers at academic institutions who used them to publish scientific papers in peer-reviewed journals.
After work, I spend time on many different types of projects that usually involve circuit design, machining, material selection, and general fabrication/hacking. My favorite place to be is my home workshop.
ben dot krasnow at gmail