bulb keel

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noun Nautical.

a narrow keel having a swelling weight of lead or iron at the bottom.

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Origin of bulb keel

First recorded in 1890–95

One day, he took a monk with a cleanly shaven head and had him walk around a light bulb to demonstrate this theory.
From Fashion Player to Photographer Monk|Nina Strochlic|December 3, 2014|DAILY BEAST
The trade in empty bottles should be as eyebrow-raising as the old Soviet dud-bulb biz.
The Cult of Pappy van Winkle|Eric Felten|December 3, 2014|DAILY BEAST
His bright idea turned out to be the incandescent light bulb, which he invented in 1880.
From Edison to Jobs|The Daily Beast|September 25, 2014|DAILY BEAST
Death waits for these things as a cement floor waits for a dropping light bulb.
American Dreams: Saul Bellow’s Masterpiece of Lamentation|Nathaniel Rich|July 27, 2014|DAILY BEAST

In 2007, the Bush administration signed a measure that would finally bring the light bulb into the 21st century.
The Chicken Littles Are Wrong: Environmental Regulations Always Spur Innovation|Daniel Gross|June 9, 2014|DAILY BEAST
But, as the keel of the boats touched bottom, each boat-load dashed into the water and then into the enemy's fire.
Gallipoli Diary, Volume I|Ian Hamilton
Bang went the fragile bulb, as it splintered into a thousand atoms, and the mercury shot in sparkling globules over the table.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills
Robert was out there under the shed, reclining in the shade against the sloping keel of the overturned boat.
The Awakening and Selected Short Stories|Kate Chopin
Should it fail, the fluid can generally be pumped out by alternate compression of the tube and the bulb.
A Manual of Clinical Diagnosis|James Campbell Todd
To maintain the vessel on an even keel he introduced four vanes, called “hydroplanes,” for regulating the depth of descent.
The Wonder Book of Knowledge|Various