It shall be unlawful for any person within the corporate limits of the city to knowingly sell any commodity or article of merchandise and make or give a false or short weight or measure therefor; or obtain money or other thing of value, under the value of $20, by misrepresentation or under false pretenses or for any person or persons owning or keeping or having in charge any scales or steelyards used in weighing live stock, hay, grain, coal or any other article to knowingly and wilfully report any false or untrue weight whereby another person shall be defrauded or injured.
(`90 Code, § 14-10)