29. Except as specified in the published particulars of the approved pattern, every non-automatic weighing machine shall be erected in such a manner that the operator can, notwithstanding the nature of the machine or its surroundings, readily take up a single position from which he can—
(a)see, directly or with the aid of mirrors, closed-circuit television or other suitable permanently installed facilities, the whole of the unladen load receptor;
(b)operate the weighing machine’s controls; and
(c)obtain a weight reading from the weighing machine.