a 
and other acouflic Difeoveries of Dr. Chladni. 395 
immediately ftarted up in a kind of enthufiafm ; and made a 
feries of experiments which convinced him that what. he 
had feen was perfectly right, and that he had it now in his 
power to carry his defign into execution. He made his ex~ 
_periments and conftructed his firft inftrument in fo private a 
manner, that no perfon knew any thing of them. On the 
8th of March 1790 his firft inftrument of this kind was com- 
pleted; and in a few days he was able to play on it fome 
eafy pieces of mufic. It was now neceflary to give to this in- 
ftrument, as it was entirely new, a new name, and that of 
euphon, which fignifies an inftrument:that has a ens, 
found, appeared to him the moft proper. 
The firft inftrument of this kind made by Dr. Chladni 
was in found, and particularly in the higher tones, as good 
as thofe which he made afterwards; but the conftru&tion 
was deficient in ftrength, fo that every week fome ‘hours 
were neceflary to keep it in proper repair; and it was’im- 
poflible to convey it the diftance of a mile without almoft 
totally deftroying it. Dr. Chiadni alfo for want of better 
tubes employed thofe ufed for thermometers, and marked 
the whole and half tones by a coating of fealing-wax on the 
under fide; but as the wax, owing to the moifture andi 
bration, often'cracked and flew off, it was attended with 
danger to the eves. It was, therefore, extremely difficult’to 
give to the conftruétion of the inftrument fufficient ftrength; 
but this the inventor at length accomplithed, fo that his 
new euphon cannot be injured or put out of tune either by 
playing or by carriage.) The third inftrament ‘conftruéted 
by Dr. Chladni was fomewhat different’ from the firft and 
the fecond; asthe fore part, which in the two former rofe 
upwards with an oblique angle, ftood’at right angles; fo that 
it could ‘be tranfported with éafe in a particular carriage 
made for that purpofe. + Inftead of the’ thermometer? tubes 
ufed in the firft; the doctor now employs’ tubes ‘of ‘different 
colours. Tn the fecond ‘iiftrument’ thofe’ for the avhole 
tones were of dark ereen glafs; but he ufed for the half 
tones, 
