Two old screw type cast iron barn or house jacks. Both made by I I & B Co.
1. 15.5 in. high marked 2 x 12 28 lb.
2. 13 in. high marked 2 x 10. 22.5 lb. Also has emblem cast in saying Vulcan and showing hammer. I can't read other words but it looks like precits and cat--?
I am guessing these are 19th century jacks, but I have no way to back that except the company.