Example sentences of "[was/were] [verb] at [adj] intervals " in BNC.

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1 When he was on the field , chairs were placed at regular intervals along each touchline so that when he made a break on the wing , he had plenty of opportunity to rest before continuing his blistering run .
2 The scheme commenced 18 Sep 66 initially with two aircraft , and three aircraft were added at periodic intervals .
3 Light pillars were spaced at regular intervals .
4 New editions of Applied Pharmacology were prepared at regular intervals , first by Clark himself and then by his successors at University College London .
5 Data to address these questions were collected largely by interview , and in order to study changes over time , they were collected at regular intervals .
6 Attempts were made at frequent intervals to contact Mr Clark without success .
7 Measurements of peroxides and ozone were made at one-minute intervals except during routine instrument calibration , or failure .
8 Analyses were made at 5–10cm intervals .
9 Additions were made at regular intervals and there was a pleasing rule that , even if a Sunday School scholar was unable to read , a book might nevertheless be lent out for the benefit of the family .
10 These patients were monitored at frequent intervals ( 1–3 months ) by physical examination , measurement of biochemical tests of liver integrity and function , and serological tests for HBV markers .
11 After discharge they were reviewed at weekly intervals and the volume of feed consumed was recorded daily throughout the four week period .
12 On one side of him was the complex inhabited thicket of the hedge in which flocks of bullfinches competed for fodder and invisibly singing warblers were stationed at thirty-yard intervals ; on the other was a great sloping reach of field , the earth a reddish copper colour and patterned like a Japanese garden with the swirls and furrows left by machinery .
13 These were repeated at various intervals during the day .
14 In both settings nine 5-minute samples were recorded at 20-minute intervals between 9 a.m. and 12 noon , using a radio-microphone .
15 The various trade and commercial directories that were published at regular intervals during the nineteenth century are a particularly useful source for the study of old market towns .
16 It was a privilege for me to be invited to one of the Criterion Evenings which were held at irregular intervals at 24 Russell Square .
17 And Hugh Schonfield 's on-going series of studies of first-century Palestine was appearing at regular intervals throughout the 1970s .
18 As well as the experimental conditions referred to above , Cohen ( 1976 ) employed conditions in which the cue to recall a particular column of letters was presented at various intervals after stimulus presentation .
19 The payroll was updated at weekly intervals for employees paid weekly wages and mid-monthly for employees paid at the end of each month .
20 This meant that Blake was allocated a special cell which was changed at irregular intervals , that had to be examined every day , and Blake and the cell completely searched at least once a fortnight .
21 The locals knew that the trough was traversed at regular intervals by natural rock bridges showing just above the mud Over the centuries , millions of rip tides had worn away the softer sandstone , leaving the harder rock strata a convenient , if slippery way for the knowing locals to gain access to the sands .
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