Oops! What is it?

Hooray! It’s time for our collaboration with the What is it? blog - can you guess what this strange contraption is for?

1363

1363. Around 16" long, take a look at Neatorama for more guesses on this device:

via puzzlephotos.blogspot

1357. This was part of a historical society display in New Hampshire, it's 4 feet high and 3 feet wide, each louver can be flipped to show the other side, which has a different set of numbers. It was submitted by a visitor who would like to find out its exact purpose.