Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1916-10-07

lists between the distances between
the points 10 which the gauges are
connected. For example, the differ.
ence in the reading Of gauges G1 and
G2 will bear the same relation to the
difference in the readings of gauges
CO and GS as the distance between
Gil and CO bears to the distance be.
tween CO and G3. II the distance be.
tween CO and Go, which we will rep
resent by LIZ, Is twice the distance be-
tween CT and GO. which we will rep.
resent by Ii, then the difference in
readings Of CO and G3 win be twice
CT and Ca, :, ..ssss.ss,s.a- So,
The reason for this relation may be
explained as follows Since the re-
slstanee between the points where
CO and G3 are connected viii be as
many times the resistance between
the points where CT and G2 are con.
nected as the length L2 is times the
| length. IL, the pressure between the
points where &c and CO are connect
ed must be as many times the pres
sure between the points where G1 and
CO are connected as Ii is times Ii,
| in order to produce the current in the
pipe. The differences in pressure be
tween different points along series
water circuit will bear the same rela.
ton to each other as exists between
the resistances between the points
where the pressures were measured.
In the electrical lcircuit the volt
meter measures the difference In
pressure between the points along the
circuit to which the terminals OF the
voitmeter are connected. Thus In
Figure 6 there are two volunteers con
nected so as 20 measure the differ
ence In pressure between two differ
emit sets OF points. II the wire com
| posing the circuit Is of the same ma
terial and same size all the way along
the circuit, then the reading Of the
two volunteers VI and w will bear
the same relation to each other as ex
lists between the lengths Ii and LIZ.
III the length LIZ is twice the length
Ii. then the resistance RI Is twice
the resistance RI, and since the value
OF the current in R2 is exactly the
same as the value Of the current In RI
l-neglscting the current through. the
there viii be twice as
much pressure required to produce
this current in RI as is required to
produce II In RI, which will result In
the reading OF w being twice the
reading Of vi. When the resistance
R2 Is three times the resistance RI
then the reading of w will be three
times the reading of VI, etc.
The electrical pressure acting on
part Of the resistance of series cir
cult bears the same relation 10 the
pressure acting on some other part oil
the same circuit as exists between
1 the resistance Of the two parts. That
| is. IL two resistances are connected In
series and they have exactly the same
resistance, then the pressure acting on
each Of them viii be exactly the same
when there is q current of the same
value through them. If, however, two
resistances are connected In series
and the resistance of one Is twice thai
of the other, then the pressure act
ing on the one of lower resistance vii
/ be one-half of the pressure acting or
I the one Of higher resistance.
Resistanees for Lamps
4 II two lamps having different re
sistances be connected in series, the
pressure acting on one lamp will not
i be the same as the pressure acting OF
| the other lamp. The lamp Of higher
resistance will have a higher pressure
acting on 1t than the one Of lower re
sistance. This relation accounts FOL
the fact that two lamps of differeni
candiepower and the same voltags
! will not operate satisfactorily in Sc
ries, because the one of lower candle
1power, or higher resistance, will have
a larger part Of the total pressure
acting on it than the one Of high can