238 OF SOUND AND HEARING. 



Accordingly as the concave of a bell shall be greater, it 

 giveth a baser sound ; the less, the more treble. 



The bigger a string, the baser sound it shall yield ; the 

 less, the more treble. 



A string, the more tightly strained, the more treble 

 sound shall it yield ; the looser, the baser : so as a little 

 bigger string more tightly strained and a less more slackly 

 shall give the same note. 



In trumpets, in like wise, in flutes, horns, and recorders, 

 pipes, also in the mouth of a man whistling, the more 

 narrow and strait they are, they give the more treble 

 sound ; the wider, or more open, the baser. 



In flutes, the air, issuing by an hole nearer the breath, 

 yields a more treble sound ; by one more distant, a baser : 

 so a little bigger flute by the nearer hole, and a smaller by 

 the more removed, may give the same note. 



In some stringed instruments (as in the viol, citterns, 

 and the like) men have found a skill for the straining of 

 the strings, beyond the first straining, so as compressing 

 them with the fingers lower down or higher up, they strain 

 them to the alteration of the note. 



If a drinking-cup of glass or silver be taken and fillipped, 

 if the water stand higher in the cup, and the cup be fuller, 

 it will give a more treble sound ; if lower, and the cup be 

 more empty, a baser. 



In an hollow pipe, such as they use for shooting of birds, 

 if one whistle with the mouth, setting the mouth to one 

 end of the tube, the sound is dulled, truly, to the by 

 stander; but if the ear be laid to the other end, it gives a 

 most sharp sound, so as it shall hardly be borne. 



Let there be a trial made, with a trunk, in the part where 

 the ear is laid, narrow, in the part where the mouth is set, 

 wider, and conversely; whether the sound be rendered 

 more treble or baser, after the manner of mirrors, which 

 contract or enlarge the objects of sight. 



OF THE MULTIPLICATION, MAJORATION, DIMINUTION, 

 AND FRACTION OF SOUND. 



It would be seen in what, how, way, manner, sound can 

 be artificially magnified and multiplied. Mirrors do effect 

 both in sight. Now the sudden reflexion of sound seems 

 to turn to augmentation: for if the voice and echo be 

 yielded together, need is that the sound be not distin- 



