Sylvia Plath’s “The Bell Jar” (post 2): What is the significance of the title? Plath’s father was an entomologist. Bell jars are used in entomology.

The conventional view seems to be that the title is only a metaphor for entrapment: http://www.shmoop.com/bell-jar/title.html

However, Plath’s father was an entomologist, and bell jars are used in entomology: https://www.youtube.com/watch?v=9R_GKoiCloI

https://books.google.com/books?id=oBENAQAAIAAJ&pg=PA470&lpg=PA470&dq=bell+jar+entomology&source=bl&ots=3tISHlXlJq&sig=r35YKaQRVkCHun3w7Nvs6AssAsE&hl=en&sa=X&ved=0ahUKEwjAoYLis6XOAhUDQiYKHWYEAg8Q6AEIOjAG#v=onepage&q=bell%20jar%20entomology&f=false

So the title may be a reference to the author’s father.