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54 THE BOOK OF THE LANTEKN. illustrate gives a much better light, probably because the two gases are better mixed before reaching the lime. L is the pin upon which the bored lime cylinder rests, and it can be moved to or from the jet by means of the shifting screw S. K is a rod which extends outside the lantern, and which is for the purpose of turning the lime cylinder. The form shown is one commonly met with, and it consists of a rod connected with a bent spiral of wire. I have long ago discarded this arrangement, as it works by fitful starts, and jerks the lime round instead of moving it by degrees. The form of lime-turner attached to the jet shown at fig. 23 is the one to select. This form is known as the mixed jet, by which the most powerful form of lime-light is obtainable, but, as already pointed out, it is not so suitable as the one before described for amateur use. Both gases must be under the same pressure, therefore two bags for 0 and H respectively must be employed, usually under the same pressure boards. The jet is safe enough in skilled hands, but is not so, unless care be taken with every detail. The two gases are led to the box or chamber W, where they mix, and impinge upon the lime through the single jet J. D repre- sents a recent improvement which I believe was first suggested by that very good authority on lantern matters, Mr. Lewis Wright; it deals with the manner of turning the lime cylinder, so that it may not become pitted by the continued action of the jet upon one spot. The primitive plan was to open the lantern door at frequent intervals, and to give the hot lime a hasty touch with the finger. Next the lime pin was furnished with a screw which could be