(1) Whenever it appears to the Administrator or to the competent authority that—
(a) any large work which is being carried on or any public amusement which is being conducted in any place is likely to impede the traffic or to attract a large number of people; or
(b) the behaviour or a reasonable apprehension of- the behaviour of the persons employed on any railway, canal or other pdblic work, or in or upon any manufactory or other commercial concern, under construction or in operation at any place necessitates the employment of additional police at such place, the Administrator, or the competent authority, as the case may be, may depute such number of additional police to the said place for so long as the necessity to employ the additional police shall appear to the Administrator or the competent authority to continue,
(2) Such additional police shall be employed at the cost of the person by whom the work, public amusement, manufactory or concern is being constructed, conducted or carried on and the said person shall pay the costs therefor at such rates as the Administrator or the competent authority, as the case may be, shall from time to time require.