Steel Ball and Tube
$20.00
- Manufacturer: S. S. Adams
- Date: c. 1940s
- Size: Tube 1.75" tall
- Condition: Good
A steel ball is made to rise and fall in a metal tube. When the ball and tube are passed for examination, it is absolutely impossible for anyone else to do it. Includes the original box and instructions. Some wear, else in good condition.
