If you&#x27;re just scanning, it&#x27;s not THE Difference Engine, it&#x27;s a replica:<p>&gt;&quot;To be clear, the museum&#x27;s difference engine isn&#x27;t an original built 160 years ago by Babbage, but rather it is a working model painstakingly designed and assembled in the 1990s. ... The London Science Museum keeps one Babbage Engine on display, but its design team also assembled a second model for a private benefactor who financed the project. That donor, Nathan Myhrvold, a former Microsoft executive, originally loaned his Babbage Engine to the Mountain View Computer History Museum in 2008 with the idea to exhibit it for just six months.&quot;