Analysis of information sources in references of the Wikipedia article "My Grandfather's Clock" in English language version.
original publication uses "tick, tick, tick, tick", "tock" was added later
Grandfather's clock [suggested by a song which was popular about 1880], a furniture-dealer's name for the kind of weight-and-pendulum eight-day clock in a tall case, formerly in common use; also grandfather clock (now the usual name): [1876 H. C. WORK Grandfather's Clock, My grandfather's clock was too large for the shelf, So it stood ninety years on the floor.]
