Also nurse shot , nursery shot , nursery cannon .
In carom games such as straight rail , balkline and cushion caroms, where all the balls are kept near each other and a cushion , and with very soft shots, can be "nursed" down a rail on multiple successful shots that effectively replicate the same ball setup so that the nurse shot can be repeated again (and again, etc.).
Excessive use of nurse shots by players skilled enough to set them up and pull them off repeatedly at will is what led to the development of the balkline carom billiards game variations, and repetitive shot limitation rules in English billiards . A clear example of why: In 1907, Tom Reece scored a record break of 499,135 consecutive points over a period of five weeks, without a miss , using the cradle cannon nurse shot .