Yes, I will not knowingly post anything here that is not public domain. Generally, anything published in the US during or before the year 1922 has now passed into the public domain. It is a bit more complicated than that, especially for later years, but that is a rough first guide. These blueprints were all published before 1920 so are fairly certain to be out fo copyright.

For later works, or many works form other countries, there are longer periods of protection.

Thanks for the comment.

I was wondering if these blueprints are in the public domain now, since they’re so old? I’m doing a little research into how exactly public domain works, but if you have a quick answer, I’d truly appreciate it!

Wonderful project you have here!

The spring house plan here is the only one I have.

- John