![](https://www.freystuff.com/wp-content/uploads/2021/02/KnE-4041-196998-F-DSCN4398-scaled.jpg)
This slide rule belonged to Theo Corbin Lewis, my grandfather. I believe it was used when he attended Bliss Electrical School, Washington, D.C. in the late 1920’s.
![](https://www.freystuff.com/wp-content/uploads/2021/02/KnE-4041-196998-Fg-DSCN4397-scaled.jpg)
![](https://www.freystuff.com/wp-content/uploads/2021/02/KnE-4041-196998-cm-DSCN4386-scaled.jpg)
![](https://www.freystuff.com/wp-content/uploads/2021/02/KnE-4041-196998-Cs-DSCN4399-scaled.jpg)
![](https://www.freystuff.com/wp-content/uploads/2021/02/KnE-4041-196998-Bk-DSCN4391.jpg)
Serial Number 196998
Clark McCoy’s K&E Catalogs – 4041 Information page
Catalog Number: MHF-539, Location: Roll Top Desk