A decorative horizontal band of fleur-de-lis and floral ornaments spans the width of the text block.

A DESCRIPTION of

The TUBA STENTORO-PHONICA

Latin: "The Stentorian-Voice Trumpet." Stentor was a herald in Homer's Iliad whose voice was said to be as loud as fifty men.

In different Figures and Dimensions;

A brief ACCOUNT of what Trials and Experiments have been made of them, both at Sea and Land.

Iconism 1. Figure A. Number 1. An "Iconism" is a 17th-century term for an illustration or diagram.

The first Instrument of this kind (though the Invention had been long before digested in my thoughts!) was by my directions made in Glass, in the Year 1670, and is described in Diagram 1, Figure A. being about 2 feet 8 inches in length, the Diameter of the great end 11 inches, and the Diameter of the little end 2 ½ inches.

In this Instrument I was heard speaking at a considerable distance by several Persons, and they likewise were heard by me, and found that it did very considerably magnify (or rather multiply) the Voice. Whereupon I caused another to be made in Brass, about 4 ½ feet in length, the Diameter of the greater end 12 inches, and of the less, 2 inches; as described in Figure A. number 2. And for the better convenience of opening and shutting the mouth without losing any part of the breath (the loss of a small part whereof sensibly abates the loudness of the voice) I caused the Mouth-piece (described in Figure A. number 3.) to be made somewhat after the manner of Bellows, so that by opening and shutting, it might answer the motion of the mouth exactly, and yet be held so close that it might not lose any part of the breath in speaking.

Diagram 1. Figure A. Number 2. Diagram 1. Figure A. Number 3.

Of this second Instrument, there were two trials made very successfully in St. James's Park; where, at one time, Lord Angier standing by the Park wall near Goring-House Goring House was a grand mansion located on the site where Buckingham Palace stands today., heard me speaking (and that very distinctly) from the end of the Mall A long, straight path in St. James's Park, London, originally used for the game of pall-mall. near Old Spring-Garden A former pleasure garden at the eastern end of St. James's Park near Charing Cross.: And at another time, His Majesty King Charles II., His Royal Highness The Duke of York, the future King James II., Prince Rupert Prince Rupert of the Rhine (1619–1682), a noted soldier, naval commander, and scientist., and divers of the Nobility and Gentry, standing at the end of the Mall near Old Spring-Garden, heard me speaking (word for word) from the other end of the Mall (though the wind were contrary); which is 850 Yards, or near ½ of a measured English Mile.

Being much encouraged by these Trials, and by His Majesty's most gracious approbation of the Invention, I resolved to make some further Experiments of this Matter, and caused a third Instrument to be made