Example sentences of "but [prep] a period " in BNC.

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1 But after a period of warming up , the computer would not reboot in either soft ( Ctrl/Alt/Del ) or hard ( ‘ big red switch ’ ) mode .
2 Citizenship presumably had certain advantages which made it worth a man 's while taking it up , but in a period of increasing civic oligarchy one may wonder how greatly these outweighed the disadvantages .
3 But over a period of time , two things disturb this equilibrium : evaporation and infiltration .
4 The third type requires such intervention but over a period of years , usually nearly into adolescence , and often there is never complete resolution .
5 I want a powder , a potion , one which will not kill immediately but over a period of months , undetected by her or any physician . ’
6 But over a period of time , erm , they are not directly equivalent , but very nearly so .
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