1959-60

84.8
RECREATION GROUNDS
The angle inside the box between the base and end of the box must
be 90 degrees. The bottom of the box must be covered on the
inside to a length of
2
ft. 8 ins. with a piece of No. i o gauge sheet
zinc (or iron).
(See diagram in A.A.A. Rules, page
1
49)•
THROWING CIRCLES
The A.A.A. recommend that the material of which the circles
for throwing the Hammer and Discus and Putting the Weight
should be made is of concrete. This decision, which is a new
one for the Discus and Weight, has been taken because it is so
difficult to maintain a grass or cinder surface in good condition
during a lengthy competition or during prolonged training periods.
It is hoped that the new concrete circles will be provided at all
athletic grounds as soon as is practicable. It is also suggested that
the attention of competitors in these events should be
drawn to the fact that, where a concrete circle exists, spiked shoes
will not be needed, but shoes or boots with rubber soles.
A detailed specification of the recommended method of con-
structing these circles is given below, together with the specification
of an alternative surface, which may be used if preferred.
SPECIFICATION
Bases for Hammer, Discus and Putting
the Weight.
These shall be level and of the following dimensions :—
Throwing the Hammer. Inside of circle 7 ft. o ins. diameter.
Throwing the Discus. Inside of circle 8 ft.
22
ins. diameter.
Putting the Weight. Inside of circle 7 ft. o ins. diameter.
The stop board to be in accordance with A.A.A. Rules.
The edging for the bases shall be metal circles
4"
thick and 3"
in depth sunk level and flush with the turf, the surface of the
bases being J" lower than the top of the edging. The surface
shall be of concrete 3" thick finished
I"
lower than the top of the
metal edging and laid on a 4" consolidated foundation of mixed
clinker and ash covered with waterproof paper.
Four :`
j
" drainage holes shall be left, spaced equidistantly round
the perimeter..
The metal circle shall be laid truly circular by centring an iron
pin
12"
long in the foundation and setting the circle accurately by
the use of a radius stick. Pegs shall then be rammed in all round
to keep it true while the concrete is being laid.
The mix for the concrete shall be as follows and it shall be as
dry as possible when deposited.
1
part British Portland Cement
2
parts Clean Sharp Sand
4. parts
I"
to
4"
gauge clean River or pit ballast or stone.