Christopher Guest

I was 12 or 13 when was introduced to the fantasy/adventure books written by the author of the famous Tarzan series, and first read this novel. The idea of a huge mole machine burrowing to the center of the earth and discovering flying reptiles and other dinosaurish creatures was magical. The writing style now seems somewhat formal and clumsy, but as a young reader I was whisked along into the unknown. Later, in the 1930s, the author has Tarzan make the journey, too. How could that not work?