Perrysburg journal. (Perrysburg, Wood Co., O. [Ohio]) 186?-1965, 1869-12-31

dlItI WhIHl bdlll dlil y SOUu suppSht nap
py Polly fell sound asleep, holding her
new mammals hand but when she woke
up next morning her first words, IN ansYieS,
to the loving smile of those blue eyes,
were, Mother, is it Christmas dayG"
"Yes, dearp
ing ?" ~
"Why, no, my little girlr'
60, I'm so glad then it isn't all a
dream !n-0ur Young Folks.
Work Performed by the Human Heart.
That wonderful little pumping engine
which we all carry around in our bosoms,
and,which runs without cessation till death
ruthlessly closes the throttle, performs an
amount of work so great as to be almost
beyond belief till substantiated by arith-
metical calculation.
If we scrutinize the mechanism of the
heart, we shall find that it involves in its
operations nearly all the principles of
hydrodynamics. 1t may, therefore, be
brought within the domain of mathemat
les as we'll asany other machine. Y II
In thesattdlnpt to calculates the power
of the human heart for a given time, we
shall arrive at some curious and interest
ing, not to say astonishing results. Few
would credit, at first, the statement that
the hearts now beating in and around the
city of New Y ork e Nert an aggregate power
ample to propel large steamer across
the Atlantic ocean at tair rate of speed,
yet we shall be able to demonstrate that
this is as much a fact, as that any OF
these steamers ever crossed that storm
torn sea.
Blood is heavier than water; its specific
gravity being, according to Booth, of from
1.0527 to 1857. For convenience, how
ever, we shall consider it as being of the
same weight as water, extreme accuracy
not being essential to our purpose, and in
our computations we shall, for the most
part and for the same reason, throw out
| fractions and use round numbers.
The pressure required at the mouth oi
tho, aorta to- torce, the blood through the
fFeseelsSefthe hashan BODY, is estimated
by Hales as being equal per square inch
| of surface, to that exerted by column o.
blood seven and one half feet high. The
pressure pers. squsre inch was estimated
| by Poisenilld as four pounds three ounces
| Others Ahavel estimated the preesure a.
| that of column of water six feet in hight
| The results vary in different experiments
but they areI sufficiently accurate to Civ,
us an average that we may rely upon a
twithin bounds They are also some thin
/ more than mere estimates, as this pressur
\ has been measured by pressure.gages in
serted into the blood vessels
We shall consider the pressure as tina
of water column six feet in hight, tn
weight of which would be nearly forty
two ounces, which, for simplicity, we vii
consider forty-two ounces, or two pound
ten ounces avoirdupois.
The average discharge of the heart a
each. .pulsationr may be estimated at on
and one,haf ounces and its nnInber Q
beats at seventy five per minutes maxim
an aggregate of 112 ounces, or seve
pounds discharged pei minute.
4 q The average kinternal diameter of tn
aorta or the first great artery throug
which the blood passes from the heaI
into the general circulation, may be take
as being in adults quarters of a
inch.
Seven pounds of blood per minute
therefore forced through this arter
against a pressure of fOrty-two ounce
equivalent to raising seven pounds 81
feet each minute, equal to raising forty
two pounds one foot, or forty-two foo
pHFPSsi ISPSn shS diameter Of theaOra ana I'll
; ahduni of, blood forced through ii "
l'nhght compute the velocity of flow, bl
that is not essential to our purpose. A
consideration of friction IN the perform
ance of this work is also omitted, so thi
? the estimate of forty two foot pounds pt
minute must be considered as considerabl
less than The actual work performed, tn
! EresuN corresponding 10 what is 1calle
lSJW ic0rk in the performance of m
? chimes.
? Forty years of this work would |
equal TO the work of twenty six thousar
) seven hundred and fifty-seVen horses f
; ono'Winute OF time, or the work of OF
hOrs6for forty-four and one half days
ten hours, -s.....----.
The work Of seven hundred and eight
J siH adult hearts 'is equal TO one nor
: power; Therefore seven hundred al
eighty.six tA6usand hearts would perf0r
the work vpt one thousaad harses.r TT
, aggregate 9 population of New fYor
/ Brooklyn and Jersey City, was, accor
$ ing TO the census OF 1860, one million OF
hundred and twenty thousand, and II mi
e be safely estimated now at one and OF
4 half milliohs.L Considering this a. eau
b TO an adult population Of twelve hundr
9 Thousand, their united heart beats, exert
0 power equal to that of one thousand d
hundred and tWenty-seven hOTSess Ave
/ aging the power of the united pulsatio
a OF adults and children as equal to that
e four-hfths theentire population, and TAXI
thsl ssnsqA ~ 1859 IS sfhaais tgY q
q culation, de work done by an the hum
2, hearts IN the United States nearly equl
J that of thiTfylwq thousand AorsR T
4 work done by the beating of all the i
2 mRn hearts ih the globe'is e,iuiValent
J thepOweT Of one million forty six tho
!, saad aud iltesn ehOrsss,, Xhe ROmir
horse power Of the engines in the or,
J EastsTp 10 toar thogsspd considering !
z aetasl horse power % be tsu Thousand, I
. pevST sEtrtsa ~ ths hunsn heart hsal