“¥999-). Mr. Luccack’s Patent for bis Paradoxical Engines 
particularly adapted to it; and a collec- 
tion of bugle-horn duets, with the light 
infantry duty. The compiled part of the 
publication does credit to Mr. Hyde’s 
tafte and judgment, and the original mat- 
ter is perfectly calculated for the purpofe 
and ule for which it is intended. We 
fhould not be juft were we to difmifs. this 
article without noticing that the chrematic 
trumpet owes its invention entirely to this 
ingenious practical mufician; who at the 
end of the prefent work gives the follow- 
ing reafons for having attempted the im- 
provement in which he has fo well fuc- 
ceeded. ** The plaisx trumpet being fo 
imperfe&, and fo confined in its f{cale, 
I found it neceffary to invent fomething 
to make it perfect, and more univerfal, 
before I could feel any fatisfaction in 
' playing it.” 
« Dr. Burney, in his Hiftory of Mufic, 
has taken particular notice of the imper- 
fe& fourth and fixth; which imperfection 
is compleatly remedied by the chromatic 
trumpet ; which alfo exprefles many notes 
never before attainable on this inftru- 
ment.”” 
A Seesnd Seit of Three Duets for Two German 
Flutes, in cvbich are introduced favourite 
National Airs, compofed, and dedicated to Mr. 
Graeff, by William Ling. 5s. Rolfe, 
Thefe duetts (in the firft page of which 
the author declares it his intention fhortly 
to publifli a fet of flute duettinos) are for the 
moft part written with elegance and con- 
trivance. The parts are printed feparate- 
ly, and run with an eafe and fmoothnefs 
very favourable to young practitioners, as 
well as grateful to thofe of a more ex- 
perienced and refined ear. The national 
airs introduced in the work are, ‘‘ Roflin 
Caftle,’’ an Irith lilt, and a celebrated 
Welchair, which Mr. Ling has handled 
with fo much tafte and addrefs, as to 
render them equally pleafing and im- 
proving. 
563 
No. 5, of °° Guida Armonica; or, Introduc- 
tien to the general knowledge of Muficy Theo+ 
retical and Praétical,” in Two Parts. The 
Firft Part confifting of Sonatas, Airs and other 
Picces for the Piano-Forte, with the requifite 
Infiruftions for Fingering and Expre(fiono— 
The Second Part containing Effays on the feves 
ral Branches of the Science, with Iluftrationsy 
Rules and Excreijes of a familiar nature an- _ 
nexed to each, by J. Rolfe. 4s. 6d. 
Longman, Clementi, and Co, 
, Our mufical readers-will recolles that 
we have, fome time fince, recommended to 
their attention the four previous numbers 
of this ingenious and edifying work.— 
The prefent number opens with eflay the 
fixth, on Modulation; in which Mr. 
Rolfe truly obferves that *¢ Modulation is 
that branch of the {cience of mufic, the 
rules of which preferibe the method of re- 
moving from one fcale to another, and 
that it is from this fource that the moft 
ftriking and varied effeéts of mufic arife.”* 
This definition is not, we muft confefs, 
very deep; but, as far as it goes, it is 
perfectly correét, and, perhaps, explains 
enough for that ftage of the fcience in 
which the ftudent is here fuppofed to be 
occupied. The exercifes on Modulation 
are very good. The fucceeding effay on 
Cadences. is at once entertaining and in- 
forming, and the minor fcales in their a- 
fcending order is very uleful, as well as the 
irregular cadence or clofe on the DOMINANT. 
We alfo approve of the exercifes on the 
accompaniment of the majar fcale in its 
afcending order, in which the author. in- 
genioufly illuttrates the perfect and irre- 
gular cadences. Effay the eighth treats 
of the difcard of the flat gth (as combined 
with its major 3d, and flat 7th) and its 
fignatures, in which fome_ particulars 
highly neceflary to be known are clearly. 
and properly explained. The annexed ap. 
peiidix contains an illuftration of the pre- 
vious exercifes; and an Anthem com-. 
po'ed by Mr. Rolfe, in which we find ipe- 
cimens both of tafte and {cience. 

_. NEW PATENTS LAYELY ENROLLED. 
MR. LUCCOCK’S FOR HIS PARADOXICAL 
ENGINE, 
N the 28th of February, Letters Pa- 
tent were granted to Mr. Joun 
Luccock, Woolftapler, of Morley, near 
Leeds, for his invention of a machine up- 
on Hydroftatic principles, to producea very 
contiderable mechanical power, and which 
Maybe applied to all the purpoles of the 
fteam engine, without the aid of fire, fteain, 
or, water-wheel. 
The principle which aétuates this ma- 
chine, is that property of non-elaftic fluids, 
whereby a fmall quantity of them may be 
made to produce a great preffure. In ap- 
plying this principle to mechanical pur? 
pofes, Mr. Luccoek ules either a cylinder 
and pifton, of the fame kind, and fake / 
tne 

