( 3»S^ ) 
An Account of the Speaking Trumpet , as it hath been contrived 
andpublijhed by vS^VSam. Moreland Knight and Baronet ^ toge» 
thr with its Vfes b 0th fit Sea and Land, Printed at Londoo 
J no 1671. 
j ^He Author of this Inftrument relateth fir/l the feveral 
X Tryals made with it 5 of which the moft cor.fidcrable 
^was, that the biggeft of thofe that have been as yet employ 'd, 
turn'd Trumpet-wife 3 being 5 foot 6 inches long, and of 
2 1 inches diameter at the great end , and 2 inches at the little^ 
When by his JVIajefties fpccial command it was trycd more 
than once ^t Deal Caftle by the Governour thereof, the voice 
was plainly hear d off at Sea, as far as the Kings Ship's ufually 
Ride, which is within two and three miles, at a time, when the 
wind blew from theihore. 
Next) He difcourfeth of the Nature of Sounds , and the 
Manner, How he conceiveth them to be magnified or mul- 
tiply ed by this Organ. Where he obferveth, !♦ That a fmall 
Tube (e.g. that of an ordinary Trumpet) does not at all mag* 
nifie Sounds, Words 3 or Syllables. 2. That 'tis neceffary, 
the diameter of the leaft end of one of thefe Inflru- 
ments be equal to ( if not greater than ) the diameter 
of the orifice of the Speakers mouth, and that what it 
wants of that, fo much the lefs does the Inftrument magnific 
the Voice. 3, That the Inftrument muft be enlarged by de:» 
grees, and not too fuddenly, 4.That the Mouthrpiece of it 
muft be fo applyed and adapted to the Speakers mouth , that 
no Air or Breath be loft , and yet the Mopth have free liberty 
of opening and fliutting, that fo the Articulation be entirely 
preferv^d. That the Poiat, where the voice is moft mag- 
nified, is the Center of its greater Orifice. 4. That the 
turning and winding of this Inftrument, either Trumpet-wife, 
or in any other Circular figure , is fo far from prejudicing 
it , that it the rather ftrengthens the voice. 7, That (as he 
with fubmiffion conceives ) the Voice, as it is tranfmittcd 
through this Inftrument from the Mouth , endeavors all the 
way to fpread and dilate it felf by Spherical Undulations 3 but 
finding 
