Measuring the Green Slope is very useful method.
The player uses a putter(or a golf club) with only a little modification with the holes for visual field aligning and the scale. The device for visual field aligning and the scale can be applied on your putter according to your own reference either in a simplified or varied way.
[ How to measure the gradient using the putter ]
If you want to know the gradient of the position 'A' and 'B',
First you locate to the position 'A', face the position 'B' and hold your putter using the holes for visual field aligning, read the scale on your putter of the Projection point of your line of sight to the point 'B'.
Let's say it was '7'. and then walk to the position 'B', face the position 'A', and hold your putter, read the scale on your putter of the Projection point of your line of sight to the point 'A', in the same way. Let's say it was '5'. The value you got at the position 'A'(7) was bigger than that you got at the position 'B' (5), and the difference between them was '2'.
It indicates that the position 'A' is higher than 'B', and the gradient is 2%.
The difference of values here names the 'Difference between Projection Points'. The gradient of 2% means there is a difference of 2cm elevation in 1-meter-distance.
You can use the method in various ways; from two locations n either side of the hole, from his/her ball to the hole, or using certain marks on the green.
From the geometric analysis, one can find out the gradient is in proportion to the difference between projection points, and this method has nothing to do with the measuring distance and the person's height(eye-level). However, there is a slight variation according to the distance between the eyes and the putter, that is to say, the difference of arm length.
The test conducted with a prototype showed that I this way anyone could very easily measure the gradient by 1%, and could improve the accuracy with practice.
There is another way of measuring the green slope based on the same principle.
If you already have the value on the level ground for a certain distance, you can tell the slope with just one measurement. For this you need a little bit of preparation and practice, however.
First of all, mark at the projection point of the line of sight on your putter for a certain distance on the level ground as shown in the figure below. For example, mark the projection point of the line of sight you got for the distance of 7 steps on the level ground. For this person, the value of the projection point of the line of sight for 7 steps on the level ground will always be the same. If there is a difference, it means it’s a slope.
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