This is a box trap with glass sides and back, the panes of glass being held in place by brads placed on both sides.
The animal does not fear to enter the box, because he can see through it: when he enters, however, and touches the bait the lid is released and, dropping, shuts him in.
This is one of the easiest traps to build and is usually successful.
Excerpt from the book:
THE BOY MECHANIC
700 THINGS FOR BOYS TO DO
WITH 800 ILLUSTRATIONS
1913, BY H. H. WINDSOR CHICAGO
POPULAR MECHANICS CO. PUBLISHERS