17098. | 
water in the main pipe cannot act upon it 
fo as to thut it, a tmall itream of water . 
is led trom the head which iu,-plies the 
main p.pe, or trom iome other tource, in 
a pipe or trouga, wich is turnithed 
wiihacock, ihuttle, or otaer contrivance, 
to regulate the quantity. {ns pipe or 
trouc 1 pours.ifs water into the bucxet 
E, of the conwivance fig. 17, which 
caufes the bucket to preponderaie, and, 
by means of the iever fixed to its axle, 
and the rod artacued to it, ‘huts the itop- 
valve: the bucker then empties its wa- 
ter, and the weight F, as foon as the 
recoil or the water in tne main pipe takes 
place, preponderating in its turn, opens 
the valve, and reftores the bucket to its 
place. By opening the cocks: more or 
lefs, and by the capacity of the buckets, 
in proportion to che weight F, the nuin- 
ber of ftrokes to be made in any giver 
time is regulated. Excepting the laf 
mentioned ftop-valve, Fig. 17, all the 
ftop-valves before defcribed, fhould be 
prevented from opening to fuch a degree 
Varieties, Literary and Philofophical. 
129 
that the aétion of the current of water 
could not fhut them. This may be done 
by ome fixed refiftance behind the valves, 
as fhewn at Fig. 1, and feveval other 
figures, or by any other convenient 
micas. 
When this invention is made uft of in 
an open river, which does not admit of 
having its water penned up by a weir or 
dan head, the main pipe ought to be 
laid fo as to be covered by the low wa- 
ters of the river; and it ought to be, 
parailel to the furtace of the river, fo as 
to have the greatett poilible deciivity that 
can be obtained in the length of*the main 
pipe: its mouth er receiving end fhould 
be thaped like that of a frumpet, or bell. 
In all cafes whatfoever, the valves ought 
to be. compleatly under water, otherwile 
fome air will enter at every ftroke, and 
derange the operations of the apparatus. 
' This fpecification bears date the 13th of 
ecember 1797, and is enrolled at the En- 
roliment Office in Chancery Lane. 

WAR LE (DES, 
LiTeRARY and PHILOSOPHICAL; 
Including Notices of Works sn Hand, Domeftic and Foreign. 
* % Authentic Communications for this Article will always be thankfully received. 
TR. BeDdDoOEs’s collection on “© Si- 
phylis’? which is fo anxioufly ex- 
pected, has’ been delayed for Weit India 
and other interefting intelligence. A 
confiderable part of it is however print- 
ed off, and the work will now make its 
appearance ina few weeks. 
Dr. HuTrown of Woolwich has in the 
prefs a courfe of mathematics, for the 
ule of f{chools and academies, &c. to 
confit of 2 vols. in 8vo. The rit vol. 
is finifhed, and the 2d volume is expected 
to be ready for publication by the be- 
ginning of the winter. From Dr. H’s 
talents and long experience in his pro- 
feffion, there is every -reafon to é¢xpect 
this wiil not only be a moft ufeful and 
valuable work, but- will completely fu- 
percede every other of the fame defcrip- 
tion. 
Mr. ROBERT MERRY, well known in 
Great Britain for his many ingenious 
productions, is preparing at Baltimore, a 
work on the State of Society and Man- 
ners in America. Such:a publication 
from fo intelligent an obferver, promifes 
at length to gratify the curiofity of the 
European reader, refpecting the comps- 
rative fituation of the United States. 
MonTHLY Mae. No. xxxv. 
An interefting volume ef Biographical : 
Anecdotes of Livine Public Characters of 
1793, is inthe prefs. It is intended to 
pubdlith a fimilar one of Public Characters 
of cach fuéceeding year. The voluine 
for the prejent year, will include upwards 
of one hundred ot the moft diftinguifhed 
perfonages now living in Great Britain; 
princes, ftatefmen, clergy, lawyers, lite- 
rati, artifts, officers of the ariny andnavy, 
&c. &c, 
Mr. ARROWSMITH, the geographer, 
whofe maps for correctnefs and beauty 
refe&t much credit on this country, is 
juft finifhing a iarge and very fine chart 
of the Great Ocean; on which ail the 
late difcoveries of - Péroufe, Colnet, 
Vancouver, &c. &c. are accurately de- 
lineated... We underffand Mr. A. kas 
alfo in confiderable forwardnefs, a large 
m p of Afia, which is to be executed in 
the fame correét and beautiful manner as 
ali his former maps have been. 
The fecond volume of the Anecdotes of 
the Founders of the French Republic has 
been delayed till the third of September, 
when it will pofitively be ready for de- 
livery. . 
Meffrs, DuLavu and Ce. propofe te 
R republif 
