The lower yard of the main-sail is called the boom, and the upper the main-sail yard.
"Man on the Ocean" by R.M. Ballantyne
You can scrape the Big Rock by just watching out for the main boom.
"A Son Of The Sun" by Jack London
Before he could do anything to secure the sail, the main-sheet parted at the boom.
"The Coming Wave" by Oliver Optic
He walked out on the foot-rope at the end of the main boom, in order to see if it was painted on the stern.
"Little Bobtail" by Oliver Optic
It looks as if they're rigging out studding sail booms on the main yards.
"Boy Scouts in the North Sea" by G. Harvey Ralphson
The other horse is a similar bar abaft, on which the main-boom sheet traverses.
"The Sailor's Word-Book" by William Henry Smyth
The main-boom had a ring working between cheeks and carrying a double block with a single block below.
"The Voyage Alone in the Yawl "Rob Roy"" by John MacGregor
Then, suddenly, the booming of the main motor stopped.
"Raiders Invisible" by Desmond Winter Hall
The man rose slowly from a sitting posture by the main boom.
"Wild Oranges" by Joseph Hergesheimer
He got in the way of the boom, and the main sheet fouled.
"The Motor Girls on the Coast" by Margaret Penrose
From the main tent sounded the boom of the big drum, the clash of the cymbals, and the blast of the cornet.
"Belford's Magazine, Vol 2, December 1888" by Various
When near Fortress Monroe, the main boom snapped short off near the jaws.
"The Story of a Strange Career" by Anonymous
Wash-ing-ton was on his way with his main force, when the boom of big guns rang out on the air.
"The Life of George Washington" by Josephine Pollard
This is true of the main boom on the St. Croix.
"Forest Life and Forest Trees: comprising winter camp-life among the loggers, and wild-wood adventure." by John S. Springer
The main-yard and spanker-boom were among the trees.
"Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle, between the years 1826 and 1836" by Robert FitzRoy
The sails flapped and her main boom lurched across and brought up with a crash.
"Wyndham's Pal" by Harold Bindloss
This useful rope holds up the main-boom, and its length is regulated by a pulley.
"Practical Boat-Sailing" by Douglas Frazar
The bullet chipped a piece out of the main boom and went, zing, across the river.
"Jack Harvey's Adventures" by Ruel Perley Smith
I called Broken-Nosed Pete and Riley to take a pull on the main boom topinlift.
"The Flying Bo'sun" by Arthur Mason
The mainsail was a big stretch of canvas and carried a main-boom sixty-five feet long.
"The Viking Blood" by Frederick William Wallace