Thanks for the reply Lee. Your response sent me on a learning curve, being new to WordPress, it was a steep one! Anyway the bottom line is that my site is now doing what I wanted. Every 10 minutes my HTML text is updated and graphs generated. This is all FTP’d to the WP site and an iframe displays it beautifully.
Michael
this is the URL https://www.sunmoonstars.ca/mag-field/
