Abstract
Observations of tidal strain components of the earth's surface by means of extensometers were initiated by K. SASSA and the value of constant l, usually called SHIDA'S number, was obtained seperately from other constants h and k.
Observations of tidal strain components in three horizontal, one vertical and two diagonal directions are made at Osakayama Observatory. Using the observed values, horizontal areal strain, vertical strain and cubical dilatation are obtained, and the numerical values of h-3l, υ and C=υ+2h-6l are caluculated therefrom.
