Ahh… Glad to hear from you, don’t recall many of my contemporaries using Pickett, most had K&E, Post, etc.
I’m a fan of the DF/CF scales, too, several things they come in handy for. Nice thing about both of them is that the fold point is precisely Pi. If you need the circumference of a circle, set the diameter (say, 2.00) on the D scale and read the circumference (6.28) directly off the DF scale, without moving the slide.
Another slide rule method I still use today is the order of calculation. Say, you need (37 x 4.70) / (3.21 ^ 2). On a calculator, I enter that as 37 x 4.70 / 3.21 / 3.21
Using a slide rule you would have to write down the value 3.21 ^ 2 if not solved in a chain calculation.
Thanks, glad you found that link.