I picked up a small 2"X5" notebook that's titled THEORY OF TRAJECTORY SHOOTING SND CONSTANT DELAY..

It also has on page 1 this information.

PATHFINDER TRAJECTORY SHOOTING CHARTS, COPYRIGHT 1935,
HARRY E. GEIST...... SPORTSMAN SCIENTIFIC SERVICE AURORA, IL

The little notebook is like a 2 ring bound notebook.

The contents are trajectory charts.... very detailed, so much in fact, I cannot make heads or tails if it. I'm 78 year young, took physics in high school, but this is gibberish to me.

I'm at a loss at posting photo on this site, but I can send photos to an email address. Please PM me if you can help me figure what this is.

Picked it up at a Minnesota gun show, over 49 years ago

Thank you in advance!

Hope that you can find a way to post pictures. There is a lot in favor using time-of-flight and delay time.
KenO

I'd be interested in seeing that, as well.

I am willing and able to help you share the images. I tried sending you a PM and it says you are over your limit.
Chris.

Add me to the list of those wanting to see what you got.