This patent model demonstrates an invention for a method of printing large music charts for educational purposes; the invention was granted patent number 78855. The type was made of wood. Each note came with its part of the staff lines, and with shoulders that interlocked and overlapped with those of its neighbors, to produce a continuous line of music.
This is an experimental sound recording made in the Volta Laboratory, Washington, D.C., on 15 April 1885. It is a recording of Alexander Graham Bell s voice.
In a ring around the center, it is inscribed in the wax: Record made April 15 1885/AGB and C.A.B. [Chichester A. Bell]/to test reproduction of numbers./ Disk A. G. B. No. 1. A paper document, probably in Alexander Graham Bell s handwriting, with a transcription of the recording is 287881.02
Leslie J. Newville, Development of the Phonograph at Alexander Graham Bell's Volta Laboratory, in Contributions from the Museum of History and Technology, United States National Museum Bulletin 218, Paper 5 (1959): 69-79.
one hundred thousand, two hundred thousand, three hundred thousand, four hundred thousand, five hundred thousand, six hundred thousand, seven hundred thousand, eight hundred thousand, nine hundred thousand, one million
three thousand five hundred and seventy one / one hundred and twenty three thousand nine hundred and forty one/ one hundred and twenty five thousand eight hundred and seventy three
one million nine hundred and forty five thousand eight hundred and seventy six / thirty-five thousand nine hundred / thirty three thousand eight hundred and seventy eight
forty eight thousand seven hundred and fifteen/ seven hundred and ninety thousand [no?] hundred and forty two / four million five hundred and thirty thousand eight hundred and seventy
forty five dollars and a half / eighty nine dollars and seventy three cents / four thousand [no?] hundred and twenty nine dollars and forty-six cents
thirty five cents / twenty five cents / thirty cents / fifty cents
half a dollar [a? seems to be missing] quarter dollar
three dollars and a half / five dollars and a quarter / seven dollars and twenty nine cents
ten dollars and a half / three thousand seven hundred and eighty five dollars and fifty six cents
This record has been made by Alexander Graham Bell
in the presence of Dr. Chichester A. Bell ----
on the 15th of April, eighteen hundred and eighty five at the Volta Laboratory
Twelve hundred and twenty one Connecticut Avenue, Washington [D.C. ?]
In witness whereof --- hear my voice Alexander Graham Bell
This early telegraph register was designed and made by Alfred Vail, who worked closely with Samuel Morse on the telegraph invention. The beige coils are electromagnets and their large size was typical for early units. Vail’s signature is stamped on the base.
Telegraph registers are electrically-activated printers that receive Morse code messages. The message travels as a series of electrical pulses through a wire. The pulses energize the register’s electromagnets which move a lever-arm holding a pen or stylus. A clockwork mechanism pulls a strip of paper across the pen or stylus, recording the message. Short pulses draw or emboss a dot, slightly longer pulses a dash. The sequence of dots and dashes represent letters and numbers.
Telegraph keys are electrical switches used to send coded messages that travel as a series of electrical pulses through a wire. Due to special difficulties in sending pulses through long underwater cables, so-called double-current keys were used. Instead of the short dots and long dashes of land-line telegraphs, submarine telegraphs sent positive pulses and negative pulses that made the receiver move right or left. The operator pressed one lever on the key to send a positive pulse and another to send a negative pulse. The code consisted of the sequence of left and right movements recorded on a paper tape.
Telegraph keys are electrical on-off switches used to send messages in Morse code. The message travels as a series of electrical pulses through a wire. The operator pushes the key’s lever down briefly to make a short signal, a dot, or holds the lever down for a moment to make a slightly longer signal, a dash. The sequence of dots and dashes represent letters and numbers. This key has a switch on the side called a circuit-closer that takes the key off-line when not in use.
This experimental telegraph register was made by James Green and was reportedly used by Rev. Henry Sheib of Baltimore and Samuel Morse on private line demonstrations in the late 1830s. After talking with Joseph Henry, Morse adopted u-shaped electromagnets like the one used on this object. The large wooden pulley supported a hanging weight that pulled the paper tape under the stylus.
Telegraph registers are electrically-activated printers that receive Morse code messages. The message travels as a series of electrical pulses through a wire. The pulses energize the register’s electromagnets which move a lever-arm holding a pen or stylus. A clockwork mechanism pulls a strip of paper across the pen or stylus, recording the message. Short pulses draw or emboss a dot, slightly longer pulses a dash. The sequence of dots and dashes represent letters and numbers.
