My wonderful husband stumbled across this video he thought might be of interest on my website.  

1947 Centron Corporation's "Sewing Pattern Interpretation"

This video explains the markings on vintage Simplicity, McCall, Butterick, Vogue and unprinted tissue patterns from the 1940's, which may be of significant help in understanding those wonderful vintage patterns with only perforated markings.  You may view by clicking on the link below or click on the new Vintage Pattern Warehouse "Video" page on the upper right hand side of this or the home page.

https://archive.org/details/200496_Sewing_Pattern_Interpretation