# Translation:Attempt of a Theory of Electrical and Optical Phenomena in Moving Bodies/Expressions

 ${\displaystyle \rho }$ Charge of an ion. m Mass of an ion. V Velocity of light in the aether. t Time. t' Local time (§ 31). T Oscillation period. ${\displaystyle {\mathfrak {v}}}$ Velocity of an ion. ${\displaystyle {\mathfrak {p}}}$ Translational velocity of ponderable matter. ${\displaystyle {\mathfrak {q}}}$ Displacement of an ion from its equilibrium position. ${\displaystyle {\mathfrak {m}}}$ Electric moment of a molecule. ${\displaystyle {\mathfrak {M}}}$ Electric moment of the unit volume of ponderable matter. ${\displaystyle {\mathfrak {d}}}$ Dielectric displacement in the aether. ${\displaystyle {\mathfrak {D}}}$ Dielectric polarization in a ponderable body. ${\displaystyle {\mathfrak {S}}}$ Electric current. ${\displaystyle {\mathfrak {E}}}$ Electric force. ${\displaystyle {\mathfrak {F}}}$ Electric force for stationary ions. ${\displaystyle {\mathfrak {H}}}$ Magnetic force.