Kathleen Schlesinger, 1911 Encyclopædia Britannica (1911)
“ The origin of the kettledrum is remote and must be sought in the East. Its distinctive characteristic is a hemispherical or convex vessel, closed by means of a single parchment or skin drawn tightly over the aperture, whereas other drums consist of a cylinder, having one end or both covered by the parchment, as in the side-drum and tambourine respectively. The Romans were acquainted with the kettledrum, including it among the tympana; the tympanum leve, like a sieve, was the tambourine used in the rites of Bacchus and Cybele. ”
