30 Watt Squirrel Cage Light Bulb
Each measures 5 1/4" tall x 2 1/2" wide.
Standard Edison Base. The second image shows three bulbs in a cluster. The 30 watt bulb is pictured on the right in the back. The bulb in the foreground is a 40 watt and the bulb on the left in the back is a 60 watt.