Section 1239(d) in Police Regulations, Bengal , 1943
(d)When joining or returning from the training college, each probationary Assistant Sub-Inspector, head constable and recruit constable may be granted, at the discretion of the Superintendent or the Principal of the Training College, as the case may be, an advance not exceeding half a month's pay. Travelling expenses from the college will be adjusted on their arrival in districts. Railway and Steamer warrants should be used as far as possible.