The type of invention that interested the narrator's mother was to draw sketch of things such as spiral of co-rk-scr-ew, ha-n-dier handle, etc.
Explanation:
"Daughter of Invention" is a short story written by Ju-lia Alv-arez. The story is about Cu-ckita and her mother, who is accustomed to inventing something every night.
The narrator mentions that her mother used to create every night, in the corner of her room, as if a scholar burning the midnight oil. She used to draw sketched of various things in the notepad brought by Cu-ckita's father from office.
