  The Lanczos potential $L_{abc}$ acts as a tensor potential for the spin-2
field strength $W_{abcd}$ in an role similar to that of the vector potential
$A_a$ for the Maxwell tensor $F_{ab}$. After some general considerations
inspired by the example of electromagnetism, we consider the linear spin-2
theory and a Born-Infeld type action in terms of $L_{abc}$.
