How did Laura Bridgman communicate through finger spelling and raised letters?

Laura Bridgman communicated by utilizing her sense of touch to master both receptive and expressive language skills. Under the guidance of Samuel G. Howe at the Perkins School for the Blind, she learned to recognize raised letters of the English alphabet with her fingers.12

To engage in conversation, she used tactile finger spelling to both receive and deliver English words. Additionally, she learned to write using a block-lettering device. These methods allowed her to interact with teachers, peers, and the public, eventually enabling her to acquire knowledge in subjects such as literature, mathematics, and philosophy.1