What is it? Game 44

This week’s collaboration with What is it? Blog brings us this strange contraption: can you guess what it is for?
Place your guess in the comment section – one guess per comment, please! You can guess as many times as you’d like. Please post no URL, so others can play. No prize this week – you’re playing for fun and bragging rights only.
For more clues, check out What is it? Blog.
Update 11/9/07 – the answer is:
“The X Rays Egg Tester”, manufactured by The Reeves-Rigling Egg Tester Co., Hamilton, Ohio, Patent number 940,361. Also known as an egg candler, these were used for detecting embryonic development or for separating shell eggs.
Congratulations to Bill #14 who got it right!














