Shear and longitudinal velocities of bulk acoustical waves (BAW) were measured in the samples of isotropic graphite of a rectangular parallelepiped shape. BAW velocity measurements allowed to determine all independent components of the tensor of elasticity of the second order in graphite. In these samples was also investigated acoustoelasticity effect: the experimentally measured dependence of the magnitude of the BAW velocity while uniaxial compression applied to the sample. According to the results of these measurements were identified all independent components of the tensor of the third order elasticity in isotropic graphite by Thurston-Brugger method.
$^1$Department of General Nuclear Physics, Faculty of physics, Lomonosov Moscow State University\
$^2$Technological Institute for Superhard and Novel Carbon Materials
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