Translation:Shulchan Aruch/Orach Chaim/265

1 It is forbidden to place a container filled with oil that has a hole over the opening of the lamp so that it will drip into it. This is a decree lest one use some of it and will be guilty of extinguishing. And if he connected it to it with lime or with plaster, it is permitted, for since it is a single utensil, he is distanced from it because of the Shabbat prohibition.

2 One should not fill a bowl with oil and place it next to the lamp and put the top of the wick into it so that it will draw after it, lest he make use of it.

3 It is forbidden to place a container, on Shabbos, beneath the candle to catch the dripping oil, because one is revoking the use of the keli. And it is permitted to place it while it's still daytime. And one may not use the dripping oil on Shabbos.

Gloss: And it is forbidden to touch a lit candle when it is hanging, even though one does not move it – and there is no concern of muktze just by touching, nevertheless it is forbidden, ​lest it will move slightly due to his touching and will tilt (Or Zarua).

4 One may place a container beneath the lamp to catch sparks, since they lack any substance, and there is no revoking a keli of its use. However, one should not place water inside it, even while it's still daytime, because one causes the sparks to extinguish prematurely. And nevertheless, it is permitted to put water inside a lamp in which one lights on the Eve of Shabbos, because one's intention is not to extinguish, rather to raise the oil.

Glossː And some say: even if one's intention is to extinguish, it is permitted; since the water is not directly beneath the flame, but beneath the oil, it is only causing the flame to be extinguished indirectly, and so is the custom. (Sma"g).