Headphone+history

In the old times, we need to hold the headphones, and stand infront of the equipment, to let the headphones work. This person is sitting and talking into an instrument and is wearing headphones.This picture is taken here,'Ham Station on Sierra Dr. Turlock, CA'. Its item ID is Crane Horace F2.(http://photos.aip.org/images/catalog/crane_horace_f2.jsp)