1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144 
Permanent Tyre Check TYRE pressure gauges which are L intended
9th June 1961, Page 84
9th June 1961
Page 84
Page 84, 9th June 1961
— Permanent Tyre Check TYRE pressure gauges which are L intended
Close
Noticed an error?
If you've noticed an error in this article please click here to report it so we can fix it.
If you've noticed an error in this article please click here to report it so we can fix it.
to be fitted permanently to each tyre on a vehicle in place of the' valve cap are now distributed in the U.K. by Eric H. Bernfield, Ltd., 282 Kingsland Road, London, E.8.
The device, which is known as the Pi-meter, has a light-alloy body A-in. in diameter with an internal thread to suit the tyre valve. At the opposite end there is a smaller clear plastic dome with a cylindrical graduated scale inside it.
When fitted on a tyre the pressure is checked by pressing down the plastic dome. This releases air from the tyre into the device and a coloured cylindrical marker is moved over the outside of the
Tags
Locations:
London