Section 237(f) in Police Regulations, Bengal , 1943
(f)At town police-stations a regular sentry shall always be on duty in uniform and shall be relieved every two hours. The officer-in-charge of the station shall assemble the men present at the station every morning and evening and tell off the constables in the order of their watch for the ensuing day or night and enter the orders in the general diary. An Assistant Sub-Inspector or a senior constable shall be placed in charge of the watch, and he shall see that the sentries are relieved at the proper time during the night. He shall always sleep close to the sentry so that his assistance can be obtained, if necessary, without the sentry leaving his post. He shall rouse the officer-in-charge of the station at any hour when he is required for public service.
