[Usagi Electric] is breathtakingly close to having his Bendix G15 vacuum tube computer up and running ... The only way to find out was to push the big green “Reset” button.

Then there are chapters on photo-electric devices and various special tubes, while the final chapter of sixty pages gives a résumé of high-vacuum practice, based on material supplied by C.

We have occasionally featured vacuum tube computers here at Hackaday and we’ve brought you many single board computers, but until now it’s probable we haven’t brought you a machine that ...