Definitionn. a stroke normally made in a downward direction
Last update: September 1, 2015
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To telescope the jars for the next blow coming up. A skilful driller never allows his jars to strike on the downstroke, they are only used to jar down when the tools stick on some obstruction in the well before reaching the bottom, and in fishing operations. [Please select]
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During an upstroke this closes, and the other opens; the reverse happening during a downstroke. [Please select]
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The next diagram (_b_) shows the first downstroke. [Please select]
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