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If more volume is needed, however, the other pump can also
be put into service. (Some very large rigs have three or four pumps.)
No full stop is required if a sentence ends with a question
mark or exclamation, or a title or abbreviation which contains its own
punctuation.
Full stops are not required after titles, headings, or sub-
headings:
CABLE-TOOL AND ROTARY DRILLING
A cable-tool rig
The stop is not necessary following common titles which are
shortened forms of a word (technically, 'contractions'):
Dr [Doctor] Mr [Mister]
St [Street] Mme [Madame]
Full stops are not necessary after the capital letters used as
abbreviations for titles of organisations and countries:
UNO United Nations Organisation
USA United States of America
Brackets are used to insert a word or a phrase into a sentence.
At Drake's rig, a 6-horsepower (4.5-watt) steamboat engine
powered the walking beam.
The words inserted between brackets are usually an
explanation or an illustration. The rules of the usage of brackets are
such:
Round brackets are used to represent an aside or an extra
piece of information which is closely related to the main subject of the
sentence.
Although the earliest drilling muds were not much more than a
plain, watery mud (recall that the Hamil brothers supposedly filled a
pit with water and ran cattle through it to make it muddy).
Square brackets are used to indicate that something is being
added by the author. This is usually for clarification or comment.
When brackets are used at the end of a sentence, the full stop
falls outside the bracket (like this).

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