
To be done before spreading
79
The slide rule
The slide rule that has been supplied with your spreader is used for
determining the flowrate in lbs per minute (step 1-4).
You use it for:
•
finding the setting of the regulating rod on the spreading chart
decal (steps 5 and 6).
•
and for performing a calibration test.
(step 7 is for the disc spreaders)
Metric and Imperial
On the front of the slide rule are metric units and on the back imperial
units.
The slide rule consists of three parts:
•
Transparent ruler with hairline; can slide along outer case.
•
Outer case with 6 steps to determine the setting.
•
Sliding ruler with the values lbs/acre and lbs/min on the imperial
side; can slide to the left or right.
Determining the flowrate (lbs/min.)
with the slide rule
Select step by step the following values on the slide rule:
1. Working width (ft)
Set the hairline of the ruler on your working width; in this example
49 feet.
2. Application rate (lbs/acre)
Push the ruler at the left slot to the right
Outer case Imperial side
Ruler with hairline
Ruler
Slot
Hairline on working width 49 feet
Push ruler to the right