Помер від серцевого нападу в 78-річному віці. Патенти Telephone (induction coils), filed October 1877, issued January 1878 Telephone (carbon diaphragm microphone), filed August 1879, issued December 1879 Microphone (loose carbon rod), filed September 1879, issued February 1880 Microphone (spring carbon rod), filed Nov 1879, issued March 1880 UK Patent 15232 filed November 8, 1887