Messing Around With Typewriter Line Spacing

Royal KMM, a classic American-made standard typewriter with whole-line spacing The KMM's line spacing clutch button How I made pencil marks spaced 1/4 inch along the left margin (before typing!) (The curved lines are from the camera lens) Aligning the reference line on the backing sheet to the edge of the card guide Resulting in evenly spaced rows of text at 1.5 line spacing!