A collection of old machines / engines on Level 0 of Thinktank Birmingham Science Museum. The area called "Power Up" These were previously on display at the old Science Museum on Newhall Street (until 1997). This is the Heinrici Hot Air Engine. It was designed in about 1900 by Professor Bygrave of Birmingham. It was used to power part of an early telephone exchange. Photo of it (took the video first, then the photo).