The ascari, native soldiers of the
Army Engineers, building a cabin for cosmic ray measurements on top of a hill near Asmara,
the capital of Eritrea.
The cabin, protected from the equatorial sun by a tent,
ready for experiments.
Bruno Rossi (middle) with
an ascari soldier (right)
and an Italian officer.
A “cosmic ray telescope” consisting of two
coincidence counters mounted on pivots
so measurements could be made
in any direction desired.