**Collection of pages from K&E catalogs for the 4019**

**Goodchild Mathematical Charts**

**Description:**

Catalog page from the 1903 catalog

The 4019 is an implemation of the Goodchild Mathematical Charts and an accessory linear slide rule. The following products are in this group:

- 4019 --- Goodchild Mathematical Chart on paper.
- 4019A - Goodchild Mathematical Chart on a drawing board.
- 4019B - A linear boxwood slide rule for use with the charts

**History:**

The following catalog listings are the entries in the K&E catalogs: