"Home occupation" means any use customarily conducted entirely within a dwelling and carried on by the inhabitants thereof, which use is clearly incidental and secondary to the use of the structure for dwelling purposes, and which use does not change the character thereof, or does not adversely affect the uses permitted in the district of which it is a part, and wherein no products are sold on the premises other than those produced thereon, no signs are displayed except as permitted by this title, no persons are employed other than domestic help, and no mechanical equipment is used other than that necessary or convenient for domestic purposes. (Ord. 1000 § 6.20, 1955)