Regulation 41
Every avoirdupois weight of the bell type of a purported value set out in column 1 of the table contained in Schedule 3 hereto shall be so constructed that—
(a)
it is of such shape that a diagram of the figure of its vertical section taken through the centre from top to base would correspond to that contained in the said Schedule; and
(b)
the height of the said weight is that set out in column 2(a) of the said table appropriate to a weight of that purported value, or approximate thereto within the appropriate limits set out in column 2(b) of that table.