trial shots

trial shots

[′trīl ‚shäts]
(engineering)
The experimental shots and rounds fired in a sinking pit, tunnel, opencast, or quarry to determine the best drill-hole pattern to use.
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References in periodicals archive ?
Also, the Polaroids precede his hiring of master printers to produce the results he sought, though he continued to use a Polaroid sometimes for set-ups and trial shots.
The operator completes the initial trial shots with the curetime suggested by the machine.