Page 28 - 4714

4 barrel d a gas, liquid, or solid used to prevent contact of
parts in relative motion, and thereby reduce
friction and wear
5 lubricant e in drilling operations, the solid deposit along
the hole wall due to filtration of the fluid part of
the mud into the formation.
6 wall f a structure in which rock layers slope away in
cake all directions from a central point
7 dome g a simple crane having lifting tackle slung from
a boom
8 derrick h a well from which salt water flows after the
petroleum contents are depleted.
9 rotary i a flammable hydrocarbon oil used as fuel in
rig lamps and heaters
10 salt- j a yellowish oil obtained from whale blubber,
water formerly used in making soap and candles and
well as a lubricating oil and a fuel for lamps.

27