# The Lawnmowers (Harmonization of Noise Emission Standards) Regulations 1992, Paragraph 6.4.2.2: Position of the measuring points on a hemisphere of radius r


In the case of a hemisphere there shall, in principle, be 12 measuring points with the following coordinates (see Figure 2) although, for the measurements on lawnmowers, not all are used:
x (x/r) r
y (y/r) r
z (z/r) r
The values x/r, y/r, z/r and z are given in Table 1:
Table I
x/r
y/r
z/r
z
1
1
0
—
1.5 m
2
0.7
0.7
—
1.5 m
3
0
1
—
1.5 m
4
−0.7
0.7
—
1.5 m
5
−1
0
—
1.5 m
6
−0.7
−0.7
—
1.5 m
7
0
−1
—
1.5 m
8
0.7
−0.7
—
1.5 m
9
0.65
0.27
0.71
—
10
−0.27
0.65
0.71
—
11
−0.65
−0.27
0.71
—
12
0.27
−0.65
0.71
—

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Source: https://www.legislation.gov.uk/uksi/1992/168/schedule/3/paragraph/6.4.2.2 (the official version)
Page: https://openlegislation.uk/lawnmowers-harmonization-of-noise-emission-standards-regulations-1992/schedule-3/paragraph-6.4.2.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.