Early industrial vintage, drop pendant light with wire cage and porcelain ceiling cap

Old antique vintage, industrial drop light pendant lighting fixture with a protective wire cage for the light bulb. This architectural light fixture also has a white ironstone porcelain ceiling mounting cap. The wire cage fits onto a brass shell "fat boy" socket and measures about 5 1/2" long and 3 1/4" across.  The socket is marked Yost on the turn key switch. This pendant light rayon fiber wrapped cord and a drop of about 36" from the ceiling.