Argus Slide PreViewer - USB Conversion
When my 103 year old grandmother passed, I found a bunch of old slides, a projector, and an Argus PreViewer. The previewer would come in handy for deciding which slides to scan. But it used 2 C cell batteries that were horribly corroded. I decided I wanted to ditch the batteries, so I changed from a 3v to a 6v bulb and soldered a USB power cord to the contacts. Now I can plug it into the wall or my computer.