« A Tunnel Long in the Making (1881) | Main | The Heavy Stuff, #15--Big Pistons (1872) »

Comments

Charles

I was intrigued and had to look this up. It's US Patent 5408 dated 1871. On Google Books you can search for "Key to Baillairgé's stereometrical Tableau" and find his 1876 book explaining the entire system. It seems to be a reference for finding surface areas and volumes for irregular solid shapes. It is definitely a very eccentric approach to solid geometry, but upon casual examination, it seems to be perfectly valid.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been saved. Comments are moderated and will not appear until approved by the author. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Comments are moderated, and will not appear until the author has approved them.

Your Information

(Name is required. Email address will not be displayed with the comment.)

Categories