Notes: "Jackson Bros. was founded by Thomas Jackson in 1892. Jackson was an instructor in mechanical and civil engineering at Yorkshire College, which is now Leeds University. He was also the author of the short book, “Slide Rules And How to Use Them”. He remained the chairman of Jackson Bros. until his death in 1945 at the age of 82. Jackson Bros. were known mostly for drawing instruments and, to a lesser extent, slide rules. They made, or imported and put their name on, both boxwood slide rules with brass cursors, and celluloid-faced slide rules with aluminum-framed celluloid cursors. This simple boxwood slide rule has only A, B, C, and D scales. The back of the slide is blank."
