Example sentences of "[noun pl] [verb] at regular [noun] " in BNC.

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1 He had been trying to put inorganic chemistry into an intelligible form for his students at the University of St Petersburg , when ( in common with various contemporaries in various countries ) he realized that if the elements are set out in order of increasing atomic weight , they display periodicity : similar elements recur at regular intervals .
2 From July 1972 a Committee of Officers met at regular intervals .
3 A shade or blind that draws up into neat horizontal folds by means of cords threaded through rings attached at regular intervals to the back of the fabric .
4 The controls on the Amie are simple , large and easy to turn with programmes marked at regular intervals .
5 Quantities ordered should be controlled by reference to pre.set maximum and minimum stock levels determined from past consumption information with orders placed at regular intervals .
6 Most LDCs experience at regular intervals external current account ( deficit ) problems due to a lack of diversified exports and/or deteriorating terms of trade because many obtain more than 50 per cent of their export earnings from one or two products , e.g. Zambia regularly obtains over 90 per cent of its foreign exchange earnings from copper .
7 I have windows broken at regular intervals and suffer a lot of abuse and foul language when I ask them to move .
8 Despite this , Bennett led seven Hudson aircraft , with captain , co-pilot and wireless operator and made the first formation delivery flight across the Atlantic in November 1940 ; similar formation flights followed at regular intervals .
9 Thus , in a lesson lasting an hour , each pupil will have been observed for a maximum of 10 minutes spread at regular intervals over the hour .
10 The road ran straight ahead , the telegraph poles passing at regular intervals to the right . .
11 Kestrels hovered at regular intervals down our motorway route .
12 They were eight-sided crystals set at regular intervals in the walls and ceiling , and they shed a rather unpleasant glow that did n't so much illuminate as outline the darkness .
13 Marshall took 5 for 35 as wickets toppled at regular intervals , and the board reached only 162 .
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