I bought this mechanical desktop calculator some years ago at a flea market.
A few years ago the elevator in my apartment building was replaced. The changed the motor, the controls and the cabin.
I could not resist and salvaged some parts of the control. Among other parts I saved the electric contactor switching the motor. Here are some Pictures. Continue reading Old electric contactor from an elevator
I found a crate with old Hewlett Packard PCB in the storage. It’s sad enough that they sit in storage so I thought I share some pictures of them. I think it’s interesting to see how they where designed back in the day. Continue reading Some old but interesting circuit boards from HP
A few years ago I bought this interesting piece of medical equipment history. It is an induction coil with interchangeable gas filled glass electrodes. It was used “treat” all kinds of medical conditions. The handbook shows a large variety of uses this device could be used on, against and for. There are electrodes for your hair, eyeballs, vaginal electrodes and many even weirder ones. All the electrodes from the handbook are pictured at the end of the video.
I think it is a medical quack.
Nevertheless it is fun to show this thing at parties an zap people whit it.
I have the handbook scanned somewhere and will add it to this post any time soon. In the meantime here is a video of me presenting this thing.