: 
‘ 
. 
“Hence, as the igure of ‘the ee a nothing to 
ite reciprocal rife and fall, any. othe o heavy, 
may be fabihituted 4 in ieu ener es jek an oa ith its 
wings a ort 
ay no ire as it is neceflary the ball, when on the 
thould eep the fame precife perpendicular wien 
8 (ince e, otherwife, it would mifs the ftream, and fall 
dowuright), fuch a fountain can only be played in a place 
e from 
“Fo UNTAI its ees in form 
To. the tube eed ets water is ae rife, te ee 
_ or lenticular head, AB, fg. 12. made of a plate of metal, 
and perforated at the top with a great number of little 
oles. 
The water rifing with vehemence towards A.B, will be 
there divided into innumerable little threads, and afterwards 
broke, and difperfed into the finett drops. 
Founrain pao oe water in form of a tab 
cloth—'To the tube A B . folder two (oneal few. 
ments, C and D, ciast ae each other, with a {crew 
E, to contra& or amplify | the interflice or chink, at plea- 
te, 
Others chufe to make a fmooth, even cleft, in a {pherical 
or lenticular head, fitted upon the tube. 
The water fpouting — this chink or cleft will ex- 
pand ach in manner of a clo 
OUNT wherein the water ae out of the eee teed 
of men, and ne anin mals.— ‘Since rived, or 
their orifices in thofe par ts whence the ae is intended to 
{po 
P trom ¢ the principles piesa laid down, it will be very 
ealy to ve whatever relates to the furniture of fountains, 
and the various forms w asian be put into by their-means ; 
all de epending on the a figure, and direction, of 
the ajutages, or se 
OUNTAIN, 2 
turned like an hour ‘ laf oo 
qhen it bas done Jpouting, may be 
paar vellels, A and a 
to fpout the ae = beac 
nifhed in EF with a jet’ a GHI he bee ae fur. 
aie with a jet n I; KL and G F are to be the other 
‘leffer tubes, open ‘at both ends, and reaching near. to the 
bottom of the veffels B and A, to which the tubes GH 
and = are likewife to reac 
w, the veffel A be filled with water, it will de- 
teen! Gok the’ tube CD; and will {pout ae Aah ty 
j by the preflure of the eae of w D. 
et ites air run 
he water could not run down and {pout at 
vat when 
el A, by turning the facia upfide down, the veffel B - 
will be the refervoir, and d make the water {pout up through 
the jet 1, the pipe KL Supplying B with air to let the . 
“fro 
"water defend: in the ci ion 
' ‘Hence, 1 s A-and B eon: juttas “inch wa- 
_ ter as will be fpoute, n an hour’s time, we shall havea 
fpouting clepfydra ‘or water:clock ; which. may: he: gradu- 
ated, or divided, into laa minutes, aoe as fhewn un- 
ae CLEPSYDRA . . 
te on he notch G, bane the .air finds a paflage, a 
FOUNTAIN. 
Fountain of Command—This nye on: the famé 
principles with thofe of the former: CAE, figiz. is a 
veflel of water parte againft oad entrance of the air, ex~ 
ae ‘through the e cock C, by which it 
2s filled, is hut e EDHB, which 
there is alfo a fmall ee hole, or notch, in the bottom 
of the pee FG a urn the coc » and fhe foun- 
will play Re ‘ome isha then ftop, then a ae again 
alternately for feveral times together. When thofe times. 
of playing an i 
coming down the pipe 
‘if the air Ss, above the water, was an fupplied as: it di- 
Pp f DE has r n into 
the lower bafon H G, de th the hole I, till it falls nee 
the top.of the notch G, the air runs up into. the upper 
we ona and fupplies t ae at os, and the foun a 
1. This is feen a little before- aad, -by a tkin of water 
nd then. 
“you may command the fountain to play. It is evident, that 
the hole I mutt . Tele. rem the hole of the ine or elfe all 
out i : ~ lower bafon, inoue rifing 
the 
high enous to ftop dice 
Fountain that begins s Play upon id fy Sg a candles Sy. 
and ceafes as Wed £0 OUt.— cylindric aera 
A . conneét. hen ate 
ends, 
the higher into the lower: 
&c. and to the hollow ‘cover of the lower veftel, ey. 
fit a little tube, or jet, F G, furnifhe cock G, 
reaching almoft to the bottom of the veffel. 
be an aperture, furnithed with a fcrew, whereby water may 
ne sien into 
upon lighti ing the candles H, &c. the air in the 
contiguous tu tubes becoming rarefied thereby, the water will 
begin to oe through G FP. 
a ftatue be made to fhed 
candle, & 
the cavity wherein nae air is lea d, 
"placed near the eyes a ie wa 
mee the aeeion of the air 
B cD . be.two 
pipes fixed to gilafs 
veflel E, which, ce a "Helle water in it, is inverted till 
fhe pipes are {crewed on —S reverting it ae i as 
to put A, *the lower end of t he {pouting pipe oa 
jar of water A, and the ower — of the parece ss 
D, the .water will {pout wu up 
Nt A, ma 
out tain in Eyi whe re rea Nien of ie play oF th the ae 
-tain is this. ae ipe © D, being two feet nine inches long, 
‘lets dawn a colamire! water which rarefies the air. r a rat 
R 
