Bsi bs au 050 1 5 2 1994 (iso 3739 1 1992) scan

¿

--

B S I

B S*AU *SO: PTL

:SUBSEC*5*2

94

Lb24bb9

0408375 5 8 3

BRITISH STANDARD AUTOM0BII;E SERIES

W

BSAU50:
Partl:

Subsection 5.2 :
1994

I S 0 3739-1 :
1992

Tyres and wheels

TW-

2. 2F

1 2 pages

Part

1. Tyres

Section 5. Industrial vehicle tyres

Subsection 5.2 Specification for
pneumatic tyres (metric series) on

ci0

tapered or flat base rims: Designation,

O

O

dimensions and marking

UDC 629.11.012.53 : 62-182. 3


BSI BS*AU*SO: PTL
BS AU 60 : Part 1

:

Subsection

: SUBSEC* 5 -2 9 4

5. 2 :

Lb24669 04 0 837 6 4LT

4

1994

National foreword
O

This Subsection of this Part of BS AU

has been prepared under the direction
of the Automobile Standards Policy Committee and is identical with IS0 3739-1
1992 Industrial tyres and
Part 1 Pneumatic tyres (metric
on 5"
tapered orflat base
Designution, dimensions and marking, published
by the International Organization for Standardization(ISO). Other Parts of this
standard are:
Part 2 Wheels and

Part 3 Vulves
Part 4 Rim profiles and dimensions
50

:

rims -

;

series)

rims -

rim

Cross-references
Internationalstandard

Corresponding B ritish Standard

BS 5776 Spe&fication for quantities, units and symbols
Part O 1982 General principles
The %chnical Committee has reviewed the provisions of IS0 3877-1 and
IS0 4223-1 to which normative reference is made in the text and has decided
that they are acceptable for use in conjunction with this standard.
IS0 31-0 1981
:

:

Compliance with a British Standard does not of itself confer

immunity

a

from

legal obligations.

e

O


BS AU 50 : Part 1 : Subsection 5 . 2 : 1994

Contents

page
National foreword

Inside fro nt page
Back page

Committees responsible
S pecification

1

Scope

2

Normative references
Definitions

3

4
5

Tyre designations
Marking
Tyredimensions

6

7

Design tyre dimensions

8

Tyre size combinations
Method of measurement of We dimensions

9
~

~~

‘ Igbles
1

2

Nominal

rim diameter code

2

Correlation between load index (LI) and tyre load-carrying capacity
(TLCC1

3

3

Correlation between speed symbol and s peed category

3

4

Coefficients for calculation of maximum overall tyre dimensions in

5

6

service

Recommended combinations of nominal section widths and
diameters

5

5

Tyre dimensional guidelines
ri m

6


I S 0 3739-1 :1 992(E)

I N TE R N ATI O N AL S TAN D AR D

Industrial tyres and rims

-

Part I:

Pneumatic tyres (m etri c seri es) on 5" tapered o r fl at base
ri m s

1

-

Designation, di m ensi ons and m arki n g

I S 0 31 -0:1 981 , General principles concerning quanti-

Scope

ties, units and symbols.

Th i s

p art o f I S 0 3739 speci fi es

m en ts,

i n cl u d i n g

m arki n g s of th e

th e

d esi g n ati on s,

m ai n

re q u i re -

d i m e n si o n s

an d

m e t ri c se ri e s o f pn e u m ati c tyre s

p ri m ari l y i n te n d e d for i n d u s t ri al ve h i cl e s for u se o n
pre pare d su rfaces. Th e t y re s a re base d o n th e fol l ow¡ n g param e te rs :
a)

speed s n o t exceed i n g 50 km /h ;

b)

u se o n 5" tap e re d o r fl at base ri m s;

c)

r i m d i am ete rs n o t exceed i n g ri i n d i am e t e r cod e

I S 0 3877-1 :1 978, Tyres, valves and tubes - List
equivalent terms

I S 0 4223-1 :1 989, Definitions

some

terms used in

d efi n i ti on s

I S 0 4223-1 ;

of

te rm s

e q u i val e n t

IS0

3877-1 .

4

Tyre designations

re l ati n g
t e rm s

tyre s,

to

are

g i ve n

see
in

The extension of the range of thi s nominal ri m

diam eter code may be considered.

0

of

I : Pneumatic tyres.

Definitions

For

NOTE 1

of

1: Tyres.

Part

fh e tyre industry - Part

3

o f 1 5.

-

I S 0 3739-2 d eal s wi t h l o ad rati n g s;

IS0

3739-3 d eal s

wi t h r i m con tou rs fo r th e se tyres.

4.1

D i m e n s i o n a l a n d co n s tru cLan a

c h a rac t e ri s ti c s

Th e ch aracte ri sti cs sh al l b e i n d i cate d as fol l ows:

Nomlnal
ri m diameter

2

wl d th

Normati ve references

Th e fo l l o wi n g

stan d ard s

co n tai n

pro vi si o n s wh i ch ,

4.1 .1

rati o

code

cod e

Nominal section width

th ro u g h referen ce i n t h i s text, co n sti tu te pro vi si o n s
o f t h i s p art o f I S 0 3739. At th e t i m e o f pu bl i cati on ,
th e e d i ti o n s i n d i cate d we re val i d . A l l stan d ard s are

Th e n o m i n al secti on wi d t h o f th e t y r e sh al l be i n d i cate d i n m i l l i m e t re s , e n d i n g e i th e r i n

su bj ect t o re vi si o n , an d parti e s to ag re e m e n ts based

O

or 5.

o n t h i s part o f I S 0 3739 are en cou rag ed to i n ve sti g ate t h e po ssi bi l i ty of appl yi n g th e m o st re ce n t e d i -

4.1 .2

Nominal aspect rati o

ti o n s of th e stan d ard s i n d i cate d bel ow. M e m be rs of
I EC an d I S 0 m ai n tai n re g i ste rs o f cu rre n tl y va l i d I n -

Th e n o m i n al aspect ra t i o sh al l

te rn ati o n al Stan d ard s.

pe rce n tag e an d s h al l be a m u l ti p l e o f 5.

be e xpre sse d as a

1


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04 0 837 9 129

.

.

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I S 0 3739-1 : 1 992(E)

4.1 .3

Tyre construction code

4. 2

Th e ty re co n stru cti o n cod e sh al l be as fol l ows:

Servi ce co n d i ti o n c h a ra c t e ri s ti c s

Th e se rvi ce co n d i ti o n ch aracte ri sti cs o r servi ce descri pti o n sh al l be i n d i cate d as fol l ows:

D

or

R

fo r rad i al p l y con stru cti on .

(a d ash ) fo r d i ag o n al con stru cti on ;

"-"

Load i n d e x
4.2.1

Speed sym bol

Load index

Th e l o ad i n d e x i s a n u m e ri cal cod e associ ated wi th
4.1 .4

a m axi m u m l o ad a ty re can carry at th e speed i n d i -

Nominal ri m diameter code

cated by i ts speed sym bo l u n d e r se rvi ce con d i ti on s

For ty re s m o u n te d o n e xi sti n g ri m s, th e cod e sh al l
be as g i ve n i n t a b l e l .

speci fi ed by th e t y re m an u factu rer.
Th e co rre l ati o n between l o ad i n d i ce s an d ty re l oad carryi n g capaci ti e s sh al l be as g i ve n i n tabl e 2.

Nom i nal ri m
d i am eter code
4

6

8

9
10

12
15

Nom i nal ri m d i am eter,

mm

1 02

1 52

203
229

D,

4.2.2

Speed symbol

Th e speed sym bol sh al l

as g i ve n i n t ab l e 3 . Th e

e re n ce speed d efi n ed as th e speed at wh i ch th e tyre
can c a rry th e l o ad co rre spon d i n g t o i ts l o ad i n d e x
u n d e r th e speci fi ed se rvi ce con d i ti on s.

254

305
38 1

Th e re fe re n ce speed for t y re l o ad
i n d u s t ri al
sym bo l A5.

2

be

speed sym bo l o r speed categ ory i n d i cates th e ref-

tyre s

sh al l

be

i d e n ti fi cati o n o f

2 5 km /h ,

¡ . e.

speed


BSI BS*AU*SO: PTL

: SUBSEC*5. 2

94

m

0 4 0 8 38 0 94 0

Lb24669

m

ISO

LI

TLCC

LI

.

-

.

3739-1 : 1 992(E)

(TLCC)

~

LI

TLCC

kg

TLCC

LI

TLCC

LI

kg

kg

kg

TLCC
kg

40

1 40

80

450

1 20

1 400

1 60

4 500

200

1 4 OM 3

41

1 45

81

462

1 21

1 450

1 61

4 625

201

1 4 500

42

1 50

82

475

1 22

1 500

1 62

4 750

202

1 5

43

15 5

83

487

1 23

1 550

1 63

4 875

203

1 5

44

I RJ

84

500

1 24

1 600

1 64

5 000

204

o00
500
1 6 000

45

1 65

85

51 5

1 25

1 650

1 65

5 1 50

205

1 6 500

46

1 70

86

530

1 26

1 700

1 66

5 300

206

17 O00

47

1 75

87

545

1 27

1 750

1 67

5 450

207

1 7 500

wu

48

1 80

88

560

1 28

1 800

1 68

5600

208

18

49

1 85

89

580

1 29

1 850

1 69

5 800

209

1 8 500

50

1 90

90

600

1 30

1 900

1 70

6000

21 0

1 9

51

1 95

91

61 5

1 31

1 950

1 71

6 1 50

21 1

1 9 500

52

200

92

630

1 32

2000

1 72

6 300

21 2

20

53

206

93

1 33

2 060

1 73

6 500

21 3

20 600

54

21 2

94

650
670

1 34

2 1 20

1 74

6 700

21 4

21 200

55

21 8

95

690

1 35

2 1 80

1 75

6 900

21 5

21 800

56

224

96

71 0

1 36

2 240

1 76

7 1 00

21 6

22 400

57

230

97

730

1 37

2

1 77

7 300

21 7

23

58

236

98

750

1 38

2 360

1 78

7 500

21 8

23 600

59

243

99

775

1 39

2 430

1 79

7 750

21 9

24

300

60

250

1 00

800

1 40

2 500

1 80

8000

220

25

O00

61

257

1 01

825

1 41

2 575

1 81

8 250

221

25 750

62

265

1 02

850

1 42

2 650

1 82

8 500

222

26 5 0 0

63

272

1 03

875

2 725

1 83

8 750

223

27 250

64

280

1 04

900

1 43
1 44

2 800

1 84

goo0

224

28

65

290

1 05

925

1 45

2 900

1 85

9 250

225

29 0 0 0

66

300

1 06

950

1 46

3

1 86

9 500

226

30

67

307

1 07

975

1 47

3 075

1 87

9 750

227

3 0 750

68

31 5

1 08

1

1 48

3 1 50

1 88

10

228

31 500

69

325

1 o9

1 030

1 49

3 250

1 89

1 0 300

229

32 5 0 0

70

335

110

1 060

1 50

3 350

1 90

1 0 600

230

33 5 0 0

71

345

111

1

1 51

3 450

1 91

1 0 900

231

34

72

355

112

1 1 20

1 52

3 550

1 92

1 1 200

232

35 5 0 0

73

365

113

1 1 50

1 53

3 650

1 93

1 1 500

233

375

114

1 1 80

1 54

3 750

1 94

1 1 800

234

36 500

74
75

387

115

1 21 5

1 55

3 875

1 95

1 2 1 50

235

38 750

76

400

116

1 250

1 56

4

1 96

1 2 500

236

4 0 O00

77

41 2

117

1 285

1 57

4 1 25

1 97

1 2 050

237

42 250

78

425

118

1 320

1 58

4 250

1 98

f 3 200

238

42 5 0 0

79

437

119

1 360

1 59

4 375

1 99

1 3 600

239

43 750

000
O90

Tabl e 3

300

O00

O00

O00

o00

o00

O00

O00

O00

500

37 5 0 0

- Correlati on between speed symbol and
speed category

I

Speed

I

symbol

km /h

I

I

A2

I

S pe e d ca t e g o ry

1)

10

A3

15

A4

20

A5f)

25')

A6

30

A7

35

A8

40

B

50

See 4.2.2.

I

3


BSI

: SUBSEC*S. Z

B S*AU *SO: PTL

94

m

0 4 0 8 38 1 8 8 7

1 b24bb9

m

6

.

IS 0 3739-1 :1 992(E)

4.3

5.2

O t h e r servi ce ch aracteri sti cs

4.3.1

Th e

wo rd

ch ara cte ri z e

“TU BE LE SS”

t y re s th at

can

s h al l

be

u sed

b e u s e d wi t h o u t

to

If

M a x i m u m s p e e d m a r ki n g

th e

m ax i m u m

a tu b e .

on

th e

4.3.2

S p e ci fi c

ad d e d

to

o f ro t ati o n ,

5

i n d i c ati o n s ,

sh ow

fo r

if

e x am p l e

i n d i c ate d

re q u i re d ,

th e

m ay

p re f e rre d

m ax i m u m

for

t y re ,

40

“m ax.

m a r ki n g s h al l

th e

by an a r r o w .

th e

co n s i s t

d e s i g n ati o n

6

th an

km /h

or

m ax. ”

l y r e dimensions

of

6.1

of

th e

d i m e n s i o n al

an d

co n -

c h ara c te ri s t i c s :

d e s i g n ati o n

t e ri s t i c s

val u e s

fo r

d esi g n

t y re

di m en -

be ro u n d e d to th e n e are s t m i l l i m e t re .

see

IS 0 31 -0,

an n e x

Fo r

B.

( l o ad

of th e

s e rvi c e

co n d i ti o n

i n d e x an d s p e e d

c h ara c -

6.1 .1

Theoretical ri m width, Rth

th e

n o m i n al

Rfh =

t h e d e s i g n ati o n o f o th e r s e w i c e ch ara c te ri s t i c s .

Th e

l o c at i o n

o f th e

ch ara c te ri s t i c s
d i s ti n ct

bu t

d i m e n s i o n al

No

m arki n g

( l o ad
in

o f th e

i n d e x an d

th e

vi c i n i ty

of

a n d co n s tru c t i o n al

s e rvi c e

speed
th e

co n d i ti o n

s ym b o l )

m a r ki n g

s h al l
o f th e

is

o th e r s e rvi c e

s p e ci fi e d

fo r

th e

ch arac te ri s t i c s

Fo r i n d u s t ri al

t y re s

= 0, 7 ap p l i e s

as p e ct

m arki n g s

( s e e 4.3.1

re l ate d

to

m arki n g

of

1 1 6A5

m a r ki n g
s ym bo l

TUBELESS

d i m e n s i o n al

l o ad

( d i s ti n c t

vi c i n i ty

o f th e

i n dex

an d

co n -

l o c at i o n

Th e

speed

bu t

in

S

th e

m arki n g )

d i s c re ti o n

m arki n g s

are

= SN

R,

+

of

a

t yre

wi t h

th e

n o m i n al

n o m i n al

Th e

s e cti o n

n o m i n al

l o ad

wi d t h

e q u al

to

d esi g n

d i am e t e r

i n dex

(LI )

speed

s ym bo l

tyre t o

th e

th e

n o m i n al

t h e o re t i c a l

X,:

Xt h )

-

i n m i l l i m e tre s ,

th e

n o m i n al

as p e ct

s e cti o n

n o m i n al
rat i o ,

h e i g h t,
s e cti o n

I f/ S (IJ/S

II
/I ,

is

e q u al

wi d th ,

S,,

e xp re s s e d

to

an d

th e
th e

as a p e r-

HIS
O0

I

co d e ,

co rre -

co rre s p o n d i n g

to

a

6.1 .4

Th e
th e

l o ad o f 1 250 kg ;

c o rre s p o n d i n g

s p e e d c a te g o ry o f 25

TUBELESS:

ri m ,

is

S,

f ro m

are e xp re s s e d

ty re

of

Design tyre overal l di ameter,

d esi g n
n o m i n al

no

t y r e s e cti o n

A5:

S

wi d th ,

tran s f e rre d

0, 4(R,

p ro d u c t

as p e ct r a t i o e q u al to 65;

ri m

fl at

defi n ed l ate r for oth er

Design tyre section height,

r a d i a l p l y co n s tru cti o n ;

t y re

be

ab o ve

s p o n d i n g t o 229 m m ;

1 1 6:

s e cti o n

m e as u ri n g

an d h!th

!!=SN-

9:

S,,

th e

ce n tag e ) :

R:

val u es may

an d

n o m i n al

i n cl u s i ve .

m an u fac t u re r

1 80 m m ;

65:

6 5 t o 85

h avi n g

o f th e

as fo l l o ws :

1 80:

tyre

wi d t h ,

Rth, t o

ri m ,

6.1 .3
c h ara c te ri s t i c s

tap e re d

th e

types.

d esi g n

s e c ti o n

an d

p re c e d i n g

l e ft to t h e

Ki

Other

ri m

5”

on

an d

SN,

fo r ty re s

Design tyre section width,

wh e re
l o c at i o n
tyre

Th e

2

m o u n te d

(Z1l.c) fro m

e q u al t o t h e p ro d u c t

wi d th ,

an d 4. 3. 2).

c h ara c te ri s t i c s

of

rat i o s

tyre and

6,1 .2

s t ru c ti o n al

Ki

ri m s ,

c h arac te ri s t i c s .

E XAM P LE

180/65R9

Ki&

K, :

s e cti o n

b as e

NOTE

l o c at i o n

Rth, i s

r i m wi d th ,

Th e th e o re t i c a l
of

s ym b o l ) ;

Cal cu l ati o n of “ d esi g n t y r e ” d i m e n s i o n s

r i m /s e c t i o n rat i o ,

4

“ 40

e x am p l e

Th e f o rm u l ae - d e ri ve d

s t ru c ti o n al

be

l ess

be m arke d

G e n e r a l m a r ki n g

Th e

c)

is

be

ro u n d i n g of val u e s ,

b)

tyre

km /h ” .

s i o n s s h al l

a)

a

s p e e d s h al l

d i re c ti o n

Marki n g

5.1

of

speed

50 km /h , i t s actu al

km /h ;

be u s e d wi t h o u t a tu be .

to

a

=

n,

ty re

o ve ra l l

ri m

h e i g h t,

+

For th e val u e s

II:

d i am e t e r,

d i am e t e r,

Do

Do,

Ilr, p l u s

i s th e

t wi c e th e

21 1

of

D, t o

b e u se d ,

s e e t ab l e

1.

su m

of

d esi g n


BS I

B S*AU *SO: PTL

:SUBSEC*5-2

94

713

0408382

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I S 0 3739-1 :1 992(E)

0

6. 1 . 5

Guidelines

for

tyre dimensions

prod u ct o f th e d e s i g n t y re secti on h ei g h t,
appro pri ate co effi ci en t,

Do,,,, D, +

G u i d el i n es for t h e d e s i g n t y re d i m en si o n s a re g i ve n

=

i n tabl e 5,

6.2

Maximum overall width i n service,
wi d th

in

ratio

1 1 -1 1

65 to a5

Rad l al

W, , ,

servi ce,

D or

Di ag on al

appro pri ate to th e d e s i g n t y re

o ve ra l l

Coefficients for calculation of maximum

Construction

secti on wi d th an d d e s i g n t y re secti on h ei g h t.

m axi m u m

an d t h e

2 Hh

consirudion

Th ese d i m en si o n s are t o be cal cu l ate d wi th th e co-

Th e

H ,

4):

overal l tyre dimensions in service

i n d esi g n i n g fo r t y re cl earan ce.

6.2.1

-

Table 4

Th i s cal cu l ati o n i s for u se by ve h i cl e m an u factu rers

4)

(see tabl e

+

Cal cu l ati o n of “ m a x i m u m o ve r a l l t y r e

d i m e n s i o n s i n servi ce”

effi ci en ts (see t a b l e

b

W
,,,,,

is

e q u al t o th e prod u ct of th e d esi g n t y re secti on wi d th ,
S,

a (see tabl e 4):

an d th e appro pri ate co effi ci en t,

w,,,= Sa
6. 2. 2

Maximum overall diameter

in

7

Th e re l e van t d i m e n s i o n s for th e re co m m e n d e d m et-

Do,,,,

service,

Design tyre dimensions

ri c

se ri e s

wi d th ,

of

i n d u s t ri a l t y re

m e as u ri n g

Table 5

-

d esi g n

h e i g h t for tyre s

85 are

of

sh own i n tabl e 5 .

Tvre dimensional guidelines

Nomi nal secti on

Desi gn tyre di mensi ons, mm

wi d th
M easu ri n g ri m
LYN

secti on

secti on

n o m i n al aspect rati o s 65 t o

an d

secti on

t y re

tyre

wi d th

e q u al t o th e n o m i n al r i m d i am eter,

pl u s twi ce th e

t y re

d esi g n

wi d th ,

Th e m axi m u m o ve ra l l d i am e te r i n servi ce, Do,m ax,
is
Il, . ,

n o m i n al

ri m

wi dth code

mm

Secti on

Secti on hei ght,

H,

at nomi nal aspect rati os

HIS

(YO)

wi dth

S

85

80

75

70

65

98

85

80

75

70

65

77

72

1 O0

2.5

110

3. 25

112

94

88

83

125

3. 25

123

106

1 O0

94

88

81

140

4. 0

141

119

112

105

98

91

160

4.0

156

136

128

120

112

104

180

5.0

180

153

144

135

126

117

200

5.0

195

170

160

i 50

140

130

225

6. 5

228

191

180

169

158

146

175

163

250

6. 5

246

213

200

188

200

8.0

283

238

224

210

196

182

315

8. 0

308

268

252

236

22 I

205

355

10.0

357

302

284

266

249

231

5


B S I BS * AU* S O: P T L
IS0

8

: SUBSEC*5. 2

94

=

Tyre si ze combinations

-

Table 6

Recommended combinations of nominal

section wi dth s and ri m diameters

wi d th s an d ri m d i am e te rs for m e t ri c se ri e s o f i n d u s-

N o m i n a i tyre

t r i a l t y re s are sh own i n t a b l e 6 .

S
N

1

Method of measu rem ent of tyre

O0

110

dimensions

1 25
1 40
be m o u n te d

1 60

on i ts m e as u ri n g ri m , i n fl ate d to th e re co m m e n d e d

B e fo re be i n g m easu red , t h e t y re sh al l

1 80

minimum of

200

a fl e r wh i ch th e

225

pre s s u re ,

an d al l o we d t o stan d for a

24 h at n o rm a l ro o m te m pe ratu re ,

N om i n al ri m d i am eter co d el )

sectl on wi d th

mm

250

i n fl ati o n pre s s u re sh al l be re ad j u s te d to t h e o ri g i n a l

280

val u e.

31 5
355

1)

4

6

-

-

-

8

9

10

-

*

-

-

-

-

12

15

*
*

*

*

*

*
*

*

*
*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

-

Combinations marked wi th an asterix ( * ) are rec-

ommended.

6

c

3739-1:1992(E)

Th e re co m m e n d e d co m bi n ati o n s o f n o m i n al secti on

9

L b 2 4 6 6 9 04 0 8 38 3 b 5 T


BSI

v

B S*AU *SO: PTL

:SUBSEC*5-2

94

W

BS AU

e

L is t of references
See

national foreword.

Lb24669 0 4 0 8 38 4 596

50

:

Part 1

:

Subsection

5.2

:

1994


BSI
BS AU

B S*AU *5O: PTL

9 4 m 162 4 669 0 4 0 8 38 5

:SUBSEC*5=2

422

m

~

50 :

Part 1 :
Subsection 5. 2 :

Committees resp onsib le for th i s

1994

IS0 3739-1 :

B ritish Standard

1992

The preparation of this B ritish S tandard was entrus ted by t h e Automobile

S tandards Policy Committee (AUE/-) to Rc hnic al Committee AUE/4, upon
which th e following bodies were represented:

Agricultural Engineers’ Association
Automobile Association
B ritish Industrial Truck Association
B ritish Pressure Gauge Manufacturers’ Association

B ritish Rubber Manufacturers’ Association
Bus and Coach Council
Department of Transport
Freight Transport Association
Ins titute of Road Transport Engineers (Inc)
Motor Cycle Industry’ s Association of Great B ritain Ltd.
Motor Industry Research Association
National Tyre Distributors’ Association
Retread Manufacturers’ Association
Road Haulage Association Ltd.
S ociety of Motor Manufacturers and Traders Ltd.

Amendments issued since publication

This B ritish S tandard, having
been p rep ared u nde r t h e
direction

of

Rxt affected

Date

Amd. No.

t h e Automobile

S tandards Policy Committee;

was published u nder t h e

autho rity of t h e S tandards
B oard an d comes into effec t o n

1 5 February 1 994

O BSI 1 994
The following BSI referenc es

relate t o the work o n this
s tandard:
Committee referenc e AUE/4
D raft for co mment 90/7763 7 DC
ISBN

9402-

O 680 22803 7
6-

0. 4k-

B

B S I, 2

TW-

Park S treet, London

2.2F-

12

W

U

2BS

B S I, M o r d Wood, Miiton K e y n e s MK14

6LJ3

Au E/4

-