Well, if you've breezed through Arthur Machen on your broomstick and are now fresh out of Halloween reading, you might download "The Hand of Selene," a free Carl and Jerry story originally published in the November 1960 Popular Electronics. In the story, the boys create a very creepy, remote-controlled severed hand for use in a seance put on by Norma for her sorority sisters. The hand rests on a glass tabletop and taps out answers to questions, and works out better than Norma had imagined when she asked the boys for help. (You'd think she'd have figured out by that time that Carl and Jerry always produce the goods!)
Here's the link:
http://www.copperwood.com/Carl_and_Jerry-V13N05-The_Hand_of_Selene.pdf 1.3 MB PDF.