5 seal the running bearing shaft 30
adequately withstand very considerable
pressures, make what term “mercury-
lock” the following provision: the shaft
30 made fine steel great and uniform
10 density and the bushing preferably of
hard copper, these having diameters leaving
a clearance only few thousandths an
inch,—much too small for the capillary ad
mission mercury. flow-meter comprising body hav
ing pipe engaging portion, lower head 55
of smaller diameter and upper casing, a
vertical shaft extending through said body,
a disk-turbine said head directly connect
ed with said shaft, said head having inlet
and outlet openings the turbine disks, G
O
and indicating means comprising rota
table primary element directly connected
with said vertical shaft and torsionally-
restrained secondary element displaceable
by the first and equipped show its dis- 65
placement desired terms. device the character described,
the combination body fitting having an
intermediate part for pipe engagement, a
lower head, and upper shell, shaft pass- 70
ing vertically from said shell said head, a
pressure-resisting seal for said shaft adja
cent said pipe engaging portion the body,
an indicator said shell comprising rota
table primary member having vertical axis 75
and directly connected with the upper end
of said shaft, torsionallv-restrained sec
ondary element displaceable, the first, said
secondary element associated with scale for
shoAving its deflections desired terms, and 80
a horizontal disk-turbine rotor said head,
said rotor directly connected with the bot
tom said shaft, said head having inlet
and outlet openings the rotor disk.
The bearing-portion the shaft thinly
copper plated, and then both bearing sur
faces are coated, quickening solution,
with mercury, after which the mercury-
20 filmed parts are assembled. And since linear relation
ships exist between the rate liquid flow,
turbine-rotation and indicator-displacement,
accurate marking the scale uniform
graduations depends only upon the estab- 50
lishment certain easily-ascertainable con
stants for any given conditions. These surfaces are
15 treated for amalgamation with mercury.
2. this yvay, as
sought graphically and exaggeratedly be
represented Fig. 85
NIKOLA‘TESLA.. Furthermore, the
practical insensibility the air drag in
strument temperature changes, without
-special compensating mechanism, makes a
very simple construction available for many 45
and variant uses.
I have found such mercury lock makes a
SO very effective and enduring seal while per
mitting adequately free rotation the
shaft. ■
The combination turbine rotor and air
drag indicating mechanism above de-
85 scribed especially advantageous that
the small turbine, developing high shaft
speed under even rather slow fluid flow, in
sures that the speeds the primary ele
ment will ample result high torque,
40 that the indicator may relatively
rugged construction.
In testimony Avhereof affix signature.
What claim is:
1. the mercury body 50
is introduced into the very narrow clearance,
and although unitary seal its re-
25 sistance the passage air water, it
may practically regarded forming two
mirror-surfaced films between the bushing
15 and the copper plating shaft 30.1,365,547
of pressure within the main, the readings
might seriously inaccurate; nor, obvi
ously, should escape the liquid from the
main into the indicator casing permitted.
i
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