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Maintenance of tester
The testers have been designed so that the minimum
amount of maintenance is required. One or two parts,
however, need some attention.
1.
Sliders should be renewed when the sliding edge
becomes burred or rounded. One slider edge can
normally be used for at least 100 different settings
(500 swings). Each slider is fixed to a small aluminium
plate, and this whole unit can easily be removed for
replacement by pulling out the pin F. All new sliders
should be roughened before use by swinging several
times over a piece of dry road.
2.
Care must be taken at all times to keep the slider
clean and free from
b oil and grease, and a check should be made that the
slider is free to turn on its spindle.
3.
For ease of operation, the leveling screws, racks, and
guides should be kept oiled. The release catch may
also need oiling from time to time, but only a small
amount of 'typewriter' oil should be used for this
purpose, being applied to the wick found beneath
screw D.
The calibration of all testers should be checked at least
once a year, and all spare sliders, whether used or
unused, should be checked for hardness and resilience at
the same time. (At present this service is carried out at the
B.S.I. Charges on application.) Testers should also be
checked if there are doubts about the performance of the
instrument, for example, if it has been damaged.
Monthly index of seasonal changes in 'skid-resistance'
Year
1
January
119
February
112
March
110
April
99
May
99
June
89
July
92
August
90
September
94
October
97
November
110
December
114
Average
101
Table 2
2
3
130
114
121
114
115
107
109
104
105
96
97
93
99
83
94
92
102
96
103
102
110
105
113
112
109
102
4
5
11
116
111
110
108
103
105
103
104
100
98
90
98
93
95
94
97
91
94
103
106
105
110
108
104
101
6
7
109
109
102
111
100
105
103
102
94
98
88
99
84
99
87
98
91
95
102
93
106
102
116
109
99
102
page 15
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