How did Samuel Gridley Howe teach Laura Bridgman to recognize letters and words?

Samuel Gridley Howe taught Laura Bridgman to communicate by utilizing her sense of touch to bridge the gap created by her sensory impairments. Because Bridgman had lost her sight, hearing, smell, and taste, Howe focused on tactile methods to help her master language.12

He taught her to recognize raised letters of the English alphabet and to receive and deliver tactile spelling of ordinary English words using her fingers. Through this process, Bridgman mastered both receptive and expressive language skills. Additionally, she learned to write using a block-lettering device. These foundational skills allowed her to acquire knowledge about the world through deliberate tactile encounters with objects.1