Again, Bell also worked on a similar “liquid” transmitter design; it was this design that permitted the first transmission of speech, on March 10, 1876, by Bell to Watson, which Bell transcribed in his lab notes as “Mr. Watson—come here—I want to see you.” The first public demonstrations of the telephone followed shortly afterward, featuring a design similar to the earlier magnetic coil membrane units described above. One of the earliest demonstrations occurred in June 1876 at the Centennial Exposition in Philadelphia. Further tests and refinement of equipment followed shortly afterward. On October 9, 1876, Bell conducted a two-way test of his telephone over a 5-km (2-mile) distance between Boston and Cambridgeport, Massachusetts. In May 1877 the first commercial application of the telephone took place with the installation of telephones in offices of customers of the E.T. Holmes burglar alarm company.