Carleton Laboratory at the <a href="https://en.wikipedia.org/wiki/Columbia_School_of_Engineering_and_Applied_Science" class="extiw" title="w:Columbia School of Engineering and Applied Science">Columbia School of Engineering and Applied Science</a>
<a href="//commons.wikimedia.org/wiki/User:Mx._Granger" title="User:Mx. Granger">Mx. Granger</a>
<span class="int-own-work" lang="en">Own work</span>