76 THE BOOK OF THE LANTERN. 



besides wrecking the lantern, smashed all the windows in 

 the hall. The cause of the disaster leaked out afterwards. 



But with proper care this jet is perfectly safe, and 

 one which I have used scores of times for purposes of 

 demonstration in crowded school-rooms. As the bulk of 

 my readers are more likely to adopt this form of limelight 

 than any other, I will give directions for working with it 

 which will at once show its simplicity. We will suppose, 

 in order to make the matter clearer, that the operator has 

 a single lantern fitted with this form of jet. 



Beyond the mere lantern and its belongings, there will 

 be required some india-rubber tubing, a box of limes, and 

 a bag or bottle of gas. The best rubber tubing is the red 

 variety ; but it is expensive. It will, therefore, be found 

 economical to adopt a plan which I myself have practised 

 with advantage. Two lengths of tubing are required, one 

 for each of the gases employed. A 6-foot length will be 

 sufficient to connect the side of the jet with the iron 

 bottle or bag ; but the length of the other piece of tubing, 

 which is to connect the H side of the jet with the nearest 

 house gas-burner, is obviously dependent upon the distance 

 of that supply from the place where the lantern is being 

 exhibited. If the nearest tap is in another room, it is best 

 to use a length of compo. (lead) gas-pipe, which is absurdly 

 cheap. Upon one occasion I remember drawing the gas 

 from another house by such a means of communication, 

 the pipe passing through two windows. But it is only 

 upon rare occasions that such a proceeding is necessary, 

 and the worker is generally able to find a source of gas- 

 supply ready to his hand. When such is the case, I 



