This is a link to the code he used then
Does the article have any biographical info on the author? You could write to the editor of MR and ask if he could forward you inquiry.
Henry
COB Potomac & Northern
Shenandoah Valley
In August 2018 issue there was an article on traverser track.
How do I contact Mr Michael Hardwick to check on latest edition of the Arduino Sketch?
Thanks
Charles Harris