Well, I got hold of W. R. Butterfield (thanks, Southern Regional Library Facility!), and was amused by the bit of the succeeding article that made its way into the scan. Museums Journal reports that a Dr. C. H. Townsend has complained of the widespread use of lantern slides at conferences:
People were annoyed by Powerpoint before it was even Powerpoint, it seems.
"The Lantern Lecture." Museums Journal 11 (1912): 346.