Originally Posted by Snuzin Susan
In place of transfer paper, I've also found that just putting your sketch straight over the board then applying pressure while tracing it (ball point pen works fine) actually leaves a mild depression in the board that can be seen quite easily.<snip>-Susan
I use a method quite similar to Susan's. In the past I would make a complete drawing in my sketch book, trace the drawing with light-weight tracing paper. More recently I've found a somewhat heavier weight tracing paper and I've been making my drawings directly on the tracing paper. I then place the tracing paper over the board and re-trace the lines with a ball-point pen. As Susan mentioned above, the ball-point pen makes an impression into the surface of the board. My work surface is at an angle and with the overhead lighting in my studio I can quite easily see the impression of the lines from the ball-point pen on the board. Tracing paper comes in a variety of sizes and is reasonably priced, too.
I will say that when I first started scratching ten years ago I used to be able to see the ball-point pen impressions on the board even if the board was laid flat on the table. But no more. Aint gettin' older grand?