Book 3 — Diagonal Corners on Disk-Record Covers
Reading edition
Having been bothered with the edges of square paper covers of disk records curling, making it unhandy to place them in a file, I remodeled them as shown in the sketch. The covers without the lower corners were so convenient that I made others by folding and pasting paper of the shape shown in the pattern. It was found desirable to use a good quality of paper for the new envelopes as this gave added protection.—J. H. Moore, Hamilton, Ontario, Can.