TY JOUR TI Modelmathematical pendulum as the method of research clock accuracy KW pendulum KW amplitude KW period KW cycloid. JO Actual directions of scientific researches of the XXI century: theory and practice AU Kireev, N.. AU Kumitskiy, B.M. AU Cavrasova, N.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov