Collection of pages from K&E catalogs for the 4102 Family of Slide Rules


The 4102 is a specialized slide rule for surveying. The 4102 was only offered as a 20" rule. The rule allows the quick interpretation of solar observations and Stadia calculations.

Catalog page from the 1915 K&E Catalog

The following model numbers are part of the 4102 Slide Rule family:

The scale set is as follows for the 4102 and N4102:

Left Front: Left Rear: Right Rear:


The 4102 first appeared in the 1915 catalog. The following is a brief history of the 4102 family of slide rules as is told in the K&E catalogs that are available at this time. Exact timing is not possible because of the time between catalogs.

Links to catalog pages for the 4102 family of slide rules:

Scans: Link to scans of 4102s