  A wide field-of-view Cherenkov telescope has been working in the surroundings
of the Yakutsk array experiment since 2012. Its main function is to measure the
waveform of the Cherenkov radiation signal induced by extensive air showers of
cosmic rays. Analysis of the dataset collected by telescope is intended for the
reconstruction of the parameters of the development of the shower in addition
to the main shower characteristics measured by the rest of the array detectors.
In this paper, the observed duration of the Cherenkov radiation signal as a
function of the shower core distance is used to estimate the depth of the
shower maximum in a different way, based on the results of model simulations.

Instrumentation and Methods for Astrophysics;High Energy Astrophysical Phenomena