Tom Swift and the Electronic Hydrolung.

Rating:
Summary: Repelatron Ray invention
Review: This is the book that introduces the Repelatron Ray invented by Tom Jr. This invention is crucial to many of Tom's future inventions especially Tom's unusual Spaceship (Challenger) which is used in many future adventures. This book takes place under the sea - the repelatron is used to hold back the water and create a large bubble to reveal an ancient undersea city.
I grew up on this series and my 12 year old grandson read all 28 volumes in about 6 weeks. That is how gripping they are for the young mind...

Rating:
Summary: Repelatron Ray invention
Review: This is the book that introduces the Repelatron Ray invented by Tom Jr. This invention is crucial to many of Tom's future inventions especially Tom's unusual Spaceship (Challenger) which is used in many future adventures. This book takes place under the sea - the repelatron is used to hold back the water and create a large bubble to reveal an ancient undersea city.
I grew up on this series and my 12 year old grandson read all 28 volumes in about 6 weeks. That is how gripping they are for the young mind...