Slide Rule

Irrigation Design Aid

click here for full size image
Courtesy of Fred Kruse

Year: 1977

Manufacturer: Kifco / Ag Rain
Havana, Illinois

Model: Water-Winch

Type: Traveling Sprinkler - Agriculture

Typical use: Agriculture, Commercial

This is the Water-Winch Traveling Sprinkler Calculator. AG-RAIN developed this slide rule soon after the concept was introduced and was in use for most of the years the 'soft hose' travelers were sold.

It was copied several times. That was important because there was little information available regarding losses in rubber hose. Another factor was the elasticity of the hose which changed the diameter and length.

This was an interesting problem because the hoses behaved differently on the materials used and the weaving process used to produce the jacket.

This information courtesy of Fred Kruse, founder of Kifco / Ag-Rain.
click here for full size image
Courtesy of Fred Kruse
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