With a tape measure
The horizontal axis is time. The vertical axis is a measure of something electrical (the wires are connected to electrical contacts on your chest).
The term horizontal deflection refers to how much something deviates from the horizontal line.
the special type of theodolite used to measure horizontal and vertical distance and horizontal angle.
you measure it.
Something that is horizontal will always stretch left and/or right, and is basically a flat, landscape line.
They are parallel to the earth's equator. So if you consider the equator as being horizontal then they are horizontal.
20 degrees is a measure of angular displacement. This cannot be converted to lateral (horizontal) displacement.
It is a measure of the average gradient or slope.
A theodolite is used to measure angles of a plane. This can be both vertical or horizontal, and it is used with high precision.
To measure Angles, Process of Measuring Horizontal and vertical Angles
If you are looking for the simple answer, you measure its horizontal distance.
With a tape measure