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loS OPTICAL PROJECTION to barely affect even the hydrogen bye-pass name ; else it will snap the jet out. The connections of this dissolver are sometimes found rather confusing, but are easily understood with a little thought. Both the channels revolving in the same direction, but on opposite sides of the plug, it will be seen that when hydrogen is turned on to the top left-hand nozzle, oxygen is turned on to the bottom right-hand nozzle. It is easily understood if we remember that the two nozzles are ' on ' which are covered by the lever in either position. This tap does however, involve very long india-rubber tubes between the tap and the jets, and on this account I prefer the other form, shown in fig. 61. In this dis- solver each supply nozzle, with its pair of jet nozzles, is on the same side of the plug, but one above the other. Therefore both jet nozzles are on the same side for each jet,and the pair of PI&. 6i.-piug Dissolving Tap nozzles are « on' towards which the lever is turned. The hydro- gen bye-pass is often provided by cutting a small groove, beyond the supply channel, right round the plug; but a con- necting tube and stop-cock, as in the ' star ' form, is better. I have my own tap so modified that the jet nozzles project at an angle towards the front, which is an improvement, further shortening the rubber tubes. This dissolver can, if preferred, be affixed sideways to the back of the lantern, so that the nozzles point upwards to the top jet and downwards to the bottom one, and very short rubber tubes then suffice. A third form of dissolver consists of two separate three-way taps arranged side by side. Dissolvers often want adjusting. The apertures may be too small to supply a good jet, and both these and the channels