Initial I as used in <i>Amazing Stories</i> volume 2, number 6.
Unknown author<span style="display: none;">Unknown author</span>
<a href="//commons.wikimedia.org/wiki/File:Amazing_Stories_Volume_02_Number_06.pdf" title="File:Amazing Stories Volume 02 Number 06.pdf">File:Amazing Stories Volume 02 Number 06.pdf</a>