Vintage Triangular Architectural Scale Ruler Lietz No 3205-23,  Denmark WEAR.  Architecture Drafting ruler triangular is three sided with measurement on top and bottom edges and sampling of the markings scales:  1, 1/2 | 1/8, 1/4 | 3/4, 3/8 | 1 1/2, 3| 16 engine divided | 3/32, 3/16. Used tool may have some fading or lightness of the numbers but typically at the end edges. One of the corners is chipped 1 1/2 (picture 6) with wear along edges from use. Refer to pictures for markings, style and examples of condition.