As mammals, they need to come to the surface to breathe at intervals of roughly 20 minutes.
These buoys are placed at intervals along specific lines of longitude throughout the Pacific and Atlantic Oceans.
Compressor stations are needed at intervals along a pipeline to pressurize the gas and keep it moving.
Over the weekend a battery of eight cannon was also fired at intervals from the town's Brass Bastion.
Little candles on saucers were burning at intervals around the edges of the tub and on the windowsill.
In many species all the individuals flower simultaneously, at intervals of a few years to decades, and then die.
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At intervals on the terrifying voyage he spread the word to his colleagues.
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At intervals along the barricaded roads stood phalanxes of police and more militia in riot gear, including batons and shields.
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Michael Noer wore an Outdoor Research hat and, at intervals, a bug net that made him look like a beekeeper.
At each location, telescopic cameras have taken hundreds of thousands of visible light lunar images at intervals of every 20 seconds.
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After disrupting its schedule earlier this week, the station has resumed normal programming, although protest messages flash across the screen at intervals.
If it misses this window, further opportunities occur at intervals of 23 hours and 56 minutes a period known as a sidereal day.
Damaging earthquakes along faults typically recur at intervals of centuries to millennia.
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In the summer before college, he wrote a computer program that prompted webcams to snap photographs, at intervals, and upload them to a Web site.
There's three sync modes: Push, for instant updates, beaconing means you can send data at intervals throughout the day, or stream data to monitor your pace.
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These are small electromagnets interleaved at intervals along the track.
Though Brood X is the largest, it is only one of a number of broods of so-called periodical cicadas that emerge at intervals of either 13 or 17 years.
At intervals, new generations had tried to break the routine of the contemporary concert, with its faculty-lounge chatter and its torturously long pauses as mallet instruments were transported around the stage.
The camera fires off still images at intervals depending upon the speed of the vehicle, then custom software blurs faces and stitches all of them together into an ever-advancing 360-degree panorama.
Other controls carrying over from the original system include a chime that sounds at 10mph intervals, starting at 45mph, and an advanced notice when fuel levels are low.
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Edwards got England off to a steady start but her side lost wickets at regular intervals.
The trust says there are already signs "at appropriate intervals" but has pledged to consider improvements.
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Bashar's bowlers picked up wickets at regular intervals on a slow and uneven pitch on Wednesday.
Ease it into the market over time in equal installments at regular intervals monthly or quarterly, say.
The lozenges are more effective, because they can be sucked at regular intervals throughout the day.
So the administration prefers to hit Iraq from the air, if necessary at frequent intervals.
Tones and foot shocks were administered separately at random intervals in the other group.
The signal is "sampled" at regular intervals, and in turn converted to a digital value.
The band can be set to vibrate at certain intervals if you don't meet a movement quota.
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They must therefore inject themselves with insulin at regular intervals or else risk coma or sudden death.
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