This section is from the "Handicraft For Boys" book, by A. Frederick Collins. Amazon: Handicraft for boys.
In setting up chemical apparatus it very often happens that a glass nozzle is needed. To make a nozzle seal off a piece of glass tube as described above and by nicking it with a file you can have the hole in the end of the tube any size you want it.
Fig. 90. how to make a hole in a tube
 
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