Sequence showing activity around oil derrick during drilling operations, including travelling block, rotary table, changing of drill stem sections. Shots of activity from top of derrick, of block, of swivel. LAS of kelly. Shot of roughneck hammering at drilling mud valve with sledge, other worker standing at controls of draw works. Shot of block rising taken from crown block platform at top of derrick. Various shots of oil men checking Christmas tree, gauges, graph recorders, volume of oil in tanks. CUs of gauges.