Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 24 · column 2 of 4 · from the scan, no model involved

SI 4 Rad I lor sc hence
(1.5 x 5.5) Standard 8.25" rail spacing
(2x6) Standard 7.75" rail spacing 8' sections
62.0%