With one of these outfits you can find out just what sound is—how it is
produced—why some pianos sound better than others—why a violin produces
a musical tone, and many other things, including a number of startling
table rapping tricks with which you can astonish your friends. A big
book of instructions tells you how to perform every experiment. Get one
of these outfits today. The best toy dealer in your town should have it;
if not, write us and we’ll tell you where you can get it.