Regulation 30
The stamp shall be placed on liquid capacity measures as follows:—
on measures made of glass, earthenware, enamelled-metal, urea formaldehyde plastic or vulcanite, it shall be etched or sand-blasted beneath or near to the indication of the purported value on the outside of the measure;
on measures made of metal (other than enamelled-metal) which are subdivided, it shall be placed both on solder affixed to the inside strips or tablets near to the top-most graduation and also on the outside of the measure near to the indication of the purported value;
on measures made of metal which are not subdivided and which have no lip or rim, it shall be placed near to the indication of the purported value on the outside of the measure;
on measures made of metal (other than enamelled-metal) which are not subdivided but which have a lip or rim, it shall, as far as practicable, be placed on the bottom of the inside of the lip or rim;
on measures other than those specified in the preceding sub-paragraphs of this regulation, it shall be placed on a plug or stud of soft metal provided for such use.