I have an older Heathkit Weather Station with LED displays
(ID-4001) but when I connected a ribbon cable to the data port it
made a very large amount of radio interference just by being
connected. Maybe the later model with an LCD display and
RS-232 interface solved that problem.
". . . . The atmosphere and the earth are part of the
same system and rotate together, so if everything was static there
would be no friction between the atmosphere and the surface of the
Earth.
However the atmosphere is a fluid and
there is unequal heating between the equator and the poles. The
unequal heating causes air density and pressure differences, and
the atmosphere develops a circulation. Because the Earth is a
rotating sphere the motion of these circulations are deflected
to preserve angular momentum. The resulting pattern of
atmospheric circulation becomes quite complicated.
In the simple case of a non rotating
Earth air would rise at the equator and descend at the poles,
and at the surface of the Earth there would be a pole
to equator ward return flow, that is a northerly wind in
the northern hemisphere and a southerly in the southern.
This would make a single "cell" of circulation equator to pole
in both hemispheres.
However as the Earth is rotating,
rather than one circulation cell, we have three. The full
hemisphere cell mentioned above reaches only to about 30°
latitude and is called the Hadley cell (
Wiki). The
rotation of the Earth affects the cell by deflecting the surface
return flow to the west in both hemispheres. These are the NE
trades of the northern hemisphere and the SE trades of the
southern hemisphere.
The other two circulation cells are the Ferrel (
Wiki)
and the Polar cell (
Wiki).
The Ferrel Cell runs in the opposite sense to the direct
thermally driven Hadley cell, so the surface winds run the
opposite way as well, and are deflected in the opposite way. So
in the northern hemisphere in the mid-latitudes the
average/predominant wind would be a SW wind. However the Ferrel
circulation is much more complicated than this simple picture
suggests, and there are flows both north and south, though both
are generally from the west."
-------Cheers, Hank
Australia
Bureau of Meteorology ------------
The differential between static and ram air pressures can be
translated into air speed.
YouTube: Torque Test Channel: Using Jet Aircraft
& F1 Tech to Debunk Leaf Blower Performance Claims
- Pitot Tube best for 100+ MPH measurements.
Used Digi-Sense EW-20250-13 (Cole-Palmer,
Datasheet)
good for 2 to 178 MPH. also displays Pressure, Speed, airflow
(CFM) & Temperature.
Hot Wire or Thermocouple
Wind pulls the heat away from thermocouple which is driven
harder than when just used to measure temperature.
See patent 2849880 below.
The Cole-Palmer web page shows 6000 ft/min as max air velocity
(60* 6000/5280=) 68 MPH max so not suitable for use on leaf
blowers.
The obsolete Kurz Instruments
KRZ480 is a hot wire type.
Alnor Model 9850 Air Velocity
Meter
This has two beads in the air tunnel. Not sure why.
Maybe for two ranges or something about how it measures?
There is an air flow arrow on top of the probe that needs to be
properly orientated.
Arrived with dead 9V battery corroded onto to battery
snaps. Some care was needed to remove old battery without
damaging snaps.
Photos
Fig 1 The protective white cap looks like
a wire nut but it is not.
Shown in Battery Test mode.
|
Fig 2
 |
Fig 3 There are two beads.
 |
Fig 4 Sims, Alnor Velometer Jr &
Alnor 9850 (Note 1)
|
Fig 5 Rear row: Alnor 3100 w/2778 Jet,
Alnor 9850
Front row: Sims, Alnor Velometer Jr.
The 9850 is the only one that runs from a battery,
so I turn it off most of the time.
|
|
Note 1: It's June 2020 and hot. I have
the upstairs North facing windows open and the upstairs South
windows closed. The front door has a screen and is
open. The wind speed meters are just inside the front
door. The idea is hot air rises and there should be a
natural draft pulling in cooler air from the North side of the
house. Note the 9850 hot wire meter is showing wind while
the other two meters are not.
Model 6000
This uses a Mercury battery (maybe the same RM42 used in the
8500 combined thermometer and hot-wire anemometer.
Mallory
|
Eveready
|
Max
mA
|
Service
Life mAh
|
Service
load (mA)
|
dia
cm
|
Len
cm
|
Wt
gm
|
Vol
cc
|
RM-42
|
E42
|
500
|
14,000
|
250
|
3.30
|
6.10
|
167
|
48
|
Note the RM-42 is very close to the size of a "D" cell.
The Keithley 502 uses a bunch of batteries, including the
RM-42 as B3 for tube filaments. 1 each 6118 and 4 each 6119 (Radio
Museum: CK6419,
CK549DX).
Vf=0.625, so two in series is 1.25 Volts, maybe the dead
voltage of the RM-42?
Vane in Tunnel
The Illinois Testing Labs manufacturers Alnor
Scientific Instruments.
Alnor Velometer Jr.
aka: ML-433 - has 8" long handle on bottom.
This is a vane in a tunnel type wind speed instrument. A
problem is the wind that's being measured consists of ambient
air which contains crud. That crud gets inside and there's
no easy to clean the inside of the meter glass.
Alnor is another name for Illinois Testing Laboratories.
See patent 2690671 below.
|
This may be the basis of the
ML-433.
A handle is added below the bottom that includes a
magnetic compass.
An airfoil shaped wind vane that can rotate 360
degrees is added at the top. It it caged by a
slide off "U" shaped sheet metal cover secured by a
metal ball chain like used on plumbing stoppers.
TM 11-6660-205-nn where nn might be 14P, 12, 15 ??
|
Photos
Fig 1 leather carry case
|
Fig 2 Range selects hole size
above scale:
U.S.A. Pat 2690671 Gr. Br. Pat
754894 others Pend.
Alnor Instrument Co. Chicago, U.S.A.
 |
Fig 3 Vent hole in straight line with
range hole
 |
Fig 4 This sheet metal covering
tunnel. Weak glue holding.
 |
Fig 5 Vane in Tunnel. Note if vane
moves up the crook
in support arm hits end of tunnel. Wind causes
vane
to move down. Note wire wound balance stub.
 |
Fig 6 Pressure in tunnel forces vane
down.
 |
Alnor Model 3002
This is considerably larger and heavier than the Alnor Velometer
Jr. above. It also has
threaded ports for pressure (left) and vacuum (right) that
accept direct jets (probes) or a connection to a rubber tube and
a remote jet (probe).
A set was quoted by the Law Instrument Co. Angola, Indiana for
the Lafayette City School. It's a kit with fewer
accessories than some more expensive set, but should work for
the school while saving money ($113.50 v. $171.50 in
1950). The contents of this kit does not match the kit
quoted in the letter.
This kit has all matching serial numbers on the meter and
Jets. It allows for measuring the flow coming out of
outlets (2220) and in flow going into inlets (2225). It
also allows using a direct orifice for low speed (2778) or high
speed (2420). Note the meter face shows all these Jet
(probe) numbers. There is no provision on the meter face
to use the meter without any probe or Jet, even though that's
mentioned in the Alnor literature.
The 3002 is a very capable model and many of the sets offered on
eBay are based on it. This is an all mechanical set, not
batteries or electronics so it works great now. Note the Model 6000 is no longer viable because
of it's need for the RM-42 Mercury Battery. To be trusted
the serial numbers of all the probes (Jets) should match the
meter serial number.
Sets and Probes
| p/n |
Description |
Range |
Supply (Pres)
Intake (Vac) |
1G Set |
2G Set |
3G Set |
4G Set |
5G Set |
| 2215 |
averaging |
>2000 FPM |
Pres |
|
|
|
|
|
| 2220 |
Angle
Supply Jet
|
>2000 FPM |
Pres |
2 |
1 |
1 |
1 |
1 |
| 2225 |
Angle
Intake Jet |
>2000 FPM |
Vac |
2 |
1 |
1 |
1 |
1 |
| 2230 |
Angle
Supply Jet
|
>2000 FPM |
Pres |
1 |
|
1 |
|
|
| 2245 |
Small
Tubing Fitting |
<2000 |
|
|
1 |
|
|
|
| 2402 |
Direct
Orifice |
1000 |
|
|
|
|
|
|
| 2420 |
3000
FPM Direct Orifice Jet |
>2000 FPM |
Pres |
|
1 |
|
|
|
| 2425 |
Duct
18" |
>2000 FPM |
|
1 |
|
1 |
|
1 |
| 2460 |
Static |
|
Pres |
1 |
1 |
1 |
|
1 |
| 2485 |
Total
18" |
|
Pres |
|
|
|
|
|
| 2726 |
Replacement
Filter Element |
|
|
|
|
|
|
|
2778
|
300 FPM Direct Orifice Jet
|
|
|
|
|
|
|
|
| 3150 |
Dust
Filter |
|
|
|
|
|
|
|
| 3290 |
Duct 9" |
>4000 |
|
1 |
|
|
|
|
| 3905 |
Tubing
Fitting |
1000 |
|
|
|
|
|
|
| 3910 |
Duct
24" |
1000 |
|
1 |
|
|
|
|
| 3920 |
Angle |
1000 |
Pres |
1 |
1 |
1 |
|
|
| 3930 |
|
1000 |
Vac |
1 |
1 |
1 |
|
|
| 2215-36 |
averaging
36" |
>2000 FPM |
Pres |
|
|
|
|
|
| 2220-36 |
Angle
Supply 36" |
>2000 FPM |
Pres |
|
|
|
|
|
| 2230-36 |
Angle
Supply 36" |
>2000 FPM |
Pres |
|
|
|
|
|
| 2425-36 |
Duct
36" |
>2000 FPM |
|
|
|
|
|
|
| 2485-36 |
Total
36" |
|
Pres |
|
|
|
|
|
The 2000 series probes take the small (3/8") tubing. The
3000 series probes take the large (?") tubing.
Photos
Poor Packaging
|
Fig 1 Alnor 3002 Set
|
Fig 2 Alnor 3002 Set
 |
Fig 4 Alnor 3002 Set with Jets numbered.
 |
Fig 5 patents: (see below) 2060848 & 2207747
|
|
Rotating Vane (Windmill)
Taylor 3132
Taylor Anemometer - three dials: Large: 0
to 100 Feet, small: 0 to 10 Hunderd feet & 0 to 10
Thousand feet. YouTube: How to use
a Taylor anemometer -
Tycos 3132 Biram Anemometer (8 vanes)
3141 single large dial, 8 vanes
Mining Artifacts - Anemometers,
Davis & Sons
UK patent 1876 No. 1128
TB Winter Newcastle Mining anemometer.
"Biram's Patent, Davis Optician Derby" (History
of Science Museum, UK)
The dial face of the Taylor 3132 looks identical to the one
for the Ship's Log.
They work the same way, that's to say they are allowed to
run for some fixed time and the total run is divided by the
time to get the speed.
From Taylor
1936 Catalog, pages: 26 & 27 shows up to 10,000
ft/min or yo to 113 MPH so not good for leaf blowers.
Short & Mason
Model
|
Comment
|
Max/Min
FPM
|
Max
Feet
|
On/Off
|
Vanes
|
Dials
|
Frame
|
$
|
3102
|
Electric
4-cups
|
|
|
|
|
|
|
148.50
|
3102A
|
"
adds Wind Vane
|
|
|
|
|
|
|
203.50
|
3112
|
Portable
100,000' total
|
3000
200
|
|
|
|
4
|
|
97.00
|
3121
|
Portable
10,000,000 total
|
3000
200
|
|
|
|
4
|
|
97.00
|
3130
|
Biram's
|
|
|
|
|
2
|
3"
|
89.00
|
3132
|
Biram's
Taylor Jewelled
|
3000
200
|
10,000
|
Yes
|
8 |
3
|
4"
|
40.00
|
3139
|
Short & Mason Pocket
Biram's
|
|
|
|
8
|
2
|
2"
|
125.00
|
3141
C3962
|
Short & Mason
Low-Reading
|
300
30
|
|
na
|
8
|
1?
|
4"
|
115.50
|
3150
|
Short & Mason
High-speed
200,000' total
|
10,000
1,000
|
|
|
|
3
|
4-1/2"
|
125.50
|
Short & Mason makes dip needles.
Taylor 1936 Catalog, pg 28 -
2974 Short & Mason Inner's Compass, $33.00 5" dia case
2974-1/2 Short & Mason Miner's Compass, $44.00,
Norwegian Type 3" dia case.
page 29
Short & Mason, Campbell-Stokes
Sunshine Recorder, $308.00 Improved style Bronze bowl
with _____ for summer, winter and equinox. adjustalbe
for latitude from 40 to 70 degrees, optically perfect
sphere.
Photos
Fig 1
|
Fig 2 It's not clear what the
purpose of the hollow tube is.
It is not an adapter to a standard camera tripod.
If you know what it's used for let me know.
 |
Fig 3
Do not turn lever to "On"
position unless fan blades
are in motion. If instrument is not in
wind stream,
and motion is desired, blow lightly on
fan. Do not
put blades in motion in any other manner.
2662
4-58 |
Spring loaded lever at about 30 on main dial is to zero
all dials.
Note wind direction in order to get dials to count
up.
The person using the anemometer should stand facing the
wind and reading the dials.
 |
Fig 4 The first generation units
have the screw seen at the top under the base foot
instead of exposed like this one. That means to
dissemble one of the old units the base foot needs to be
removed.
Note the bottom screw is recessed and would clear the
base casting if it was that big.
But . . . . they made a mistake and bored the clearance
hole in the basefoot casting in such a way that it
removed the part number.
If they would have put the clearance hole on the plain
side you could read the part number.
 |
|
|
FloRite & Floret
Both made by the Bacharach Instrument Co of Pittsburgh, PA.
FlowRite MRF Style 3035 A
Range: 0 to 35 MPH (0 to 3000 ft per min).
Has manual scale lock to capture reading, or can be turned off
so reading varies with wind.
Floret Air Velocity Indicator
Restrained vane type.
Knurled screw at bottom is air inlet. Aim into air flow.
Four air outlet holes on back
Patents
Bacharach
Instrument Co Holds many patents related to industrial gas
measurements, but these instruments are aimed at commercial HAVC
applications and I haven't found any patents that cover them,
but expect there should be one for the scale lock toggle/screw
device.
Fig 1
|
Fig 2
 |
Ultrasonic (Wiki)
Can measure very slow and high wind speeds and some models
work in three dimensions. Tend to be priced over $1,000.
The Campbell Scientific Inc. CA-9 Path-Averaging
Laser Anemometer seems to be a pioneer introduced in
1974. I'm trying to figure out how it works.
3966324
Laser doppler anemometer,Paul D.
Iten, Brown
Boveri AG (Campbell Scientific: CA-9), App: 1973-04-18, 356/28.5; 356/28 -
Acoustic resonance (Wiki)
The NETATMO wind speed/direction sensor may be of
this type. It's priced way below the other ultrasonic
sensors and does not appear to have the bumps they have for
the transducers.
5877416
Anemometer employing standing wave normal to fluid flow and
traveling wave normal to standing wave, Savvas
Kapartis, FT
Tech Ltd, 1999-03-02, -
Anemometer Patents
|
1050350 Anemometer, Henry
Davis, 1913-01-14, 73/861.85; 415/4.3 - |
|
1401877
Flow-meter for gases, Robert
H Davis, 1921-12-27, 172/719 - nozzle sends air to paddle
attached to meter needle. Not vane in tunnel. |
|
1535421
Anemometer, John
E Jones, MSA
Safety Inc, 1925-04-28, 73/861.05 - |
|
1560535
Anemometer, Carl
O Burton, 1925-11-10, 188/155; 340/601 - spinning
cups drive electric generator has output corresponding
to the current wind speed. |
|
1684350
Rotary-type flow meter, Hamill
William Wilson, 1928-09-11, 73/861.81; 73/254; 73/861.88 -
spinning rotor, not vane in tunnel. |
|
1905444
Anemometer, Alfred
U Davis, Davis Instr Mfg Co, 1933-04-25, 73/861.85; 73/514.39; 73/524; 310/93
- Cups or rotating vanes, uses spinning fan as
part of mechanism to display speed instead of dials for
run.
eBay listing: Post WW2 Casella hand held anemometer
There's another speed indicating anemometer where the
readout looks like an electrical panel meter (probably
is and the cope drive a generator).
AN/PMQ-3A Airflow Inst Co. - the spinners may have a
1/4" phone plug as the attachment.
|
1967449
Hand wind gauge, Ostman Carl Johan, 1934-07-24, 73/861.85 -
spinning vane with rotation counter. Sort of a
windmill. Can zero counter using the hand holding the
gauge keeping the other hand free to work the watch.
 |
 |
 |
2060848 Air velocity meter, John
R Boyle, Illinois
Testing Laboratories, 1936-11-17, 73/202;
73/861.76; 138/DIG.4 - purely mechanical, Single port
with two tubes. Vane (35) in tunnel above meter pivot. |
|
|
|
RE21127
Air velocity meter, John
R Boyle, Illinois
Testing Laboratories, 1939-06-27, 73/202 - 2060848
There must have been at least one law suit over this
patent in order for it to be reissued.
|
 |
 |
|
2207747
Velocity meter, Joseph
A Manarik, Kenneth
H Miller, Illinois
Testing Laboratories,App: 1936-11-11, Pub:
1940-07-16, 73/202; 73/861.76; 73/187 -
The Push To Read button (63) keeps the needle locked and
also has a hold measurement function.
Jets (probes) are covered in this patent. The word
"jet" in the 1930s may not have been common.
Note it's not at all clear how to connect the tubing to
the meter.
Note the word "Velocity" implies speed and
direction. These instruments only measure speed so
that would be a more appropriate word in the title.
|
|
 |
|
2315185 Air velocity meter, John
R Boyle, Illinois
Testing Laboratories,1943-03-30,73/202; 73/430; 73/861.76;
123/198F - purely mechanical with hose
fittings on either side of meter for external probes.
Vane in tunnel above meter pivot.
A number of the Alnor (Illinois Testing
Laboratories) sets on eBay have Boyle in the title.
|
2316255
Anemometer, Knobel Max, Packard Robert Henry, GMC, 1943-04-13,
73/861.75 - to operate
at < 5 feet/minute (inside refrigerators), remote reading
2342290
Jet for air velocity meters and the like, Kenneth H Miller, Illinois
Testing Laboratories, 1944-02-22, 73/202; 73/861.65 - I'd call it a probe.
2346864
Anemometer, Packard Robert Henry, 1944-04-18, 73/861.85; 250/232; 250/237R; 324/175; 416/5; 416/241R
-
2377884
Means for measuring wind velocity, Hillman
Leon, 1945-06-12, - (later on Anemostat
Corp model 60)
2389615
Anemometer, James
P Eder, 1945-11-27, - hot wire (later on Anemostat
Corp model 60)
2608859
Propeller anemometer, Harcourt
C Sontag, Cordero
Fidel, Samuel
H J Womack, 1952-09-02, 73/170.07; 33/402 -
2612047
Probe device for fluid condition measuring apparatus, Henry O Nilsson, Leonard R Phillips, Anemostat
Corp, 1952-09-30, -
2612780
Resistance thermometer, Bruyne Emil A De, Illinois
Testing Laboratories, 1952-10-07, 374/183; 374/144 - cal plugs
for 0 - 100F, 100 - 200F & 200 - 300F. linear wire
sensor.
2648224
Apparatus for measuring velocity and temperature of fluids,
Leonard R Phillips, Henry O Nilsson, Anemostat
Corp, 1953-08-11
2690671
Air velocity meter, John A Obermaier, Alfred A
Obermaier, Alnor
Inst Co, 1954-10-05, 73/861.76; 73/431; 220/664 - purely mechanical
with port on left and right sides. This is the Velometer
Jr.
|
 |
2690671
Air velocity meter, John A Obermaier, Alfred A
Obermaier, Alnor
Inst Co, 1954-10-05, 73/861.76; 73/431; 220/664 -
purely mechanical with port on left and right
sides.
This is the Velometer Jr.
Works in any orientation.
There's a claim of easy glass removal &
replacement. How?
|
|
|
2779194
Wind-gauge working on the pressure principle, Slettenmark
Karl Ivar Gustav, 1957-01-29, 73/861.57 -
|
|
|
2800018
Probe device for fluid condiction measuring apparatus,
Leonard R Phillips, Robert L Miller, Godes Elliot, Franz
J Kurth, Anemostat
Corp, 1957-07-23, -
|
|
|
2838932
Anemometer, James G Dwyer, DWYER Manuf,1958-06-17, 73/170.16; 73/170.07; 73/170.14
- (Official
web page) - Pitot tube remote reading
|
|
 |
2849880
Thermal anemometers, Alfred A Obermaier, Illinois
Testing Laboratories, 1958-09-02, 73/204.24 -
Hot-wire Anemometer (Wiki)-
mentioned thermocouple, not thermister.
|
|
|
2889707
Anemometer, Walter
J Snider, 1959-06-09, 73/861.76; 73/170.15 - wind
direct against vane with spring so reads out in MPH/KPH
|
|
|
2923152
5-prong aerodynamic pickup, Jr
George C Mabry, Andrew
A Mahoff, Charles
E Pettingall, Douglas
Aircraft, 1960-02-02, - angle of attack, angle of
sideslip and indicated airspeed. |
|
|
2993374
Air meter, Frank W Dwyer, Locke
John, DWYER Manuf, 1961-07-25, 73/861.55 - pith
ball floats in tube to indicate wind speed. |
3242730
Air velocity meters, Veikko
K Peltola, Illinois
Testing Laboratories (Alnor), 1966-03-29, 73/861.76 - internal 1.35 V Mercury battery
(obsolete) used for damping, has left and right ports for
attachments.
3463003
Air velocity measuring apparatus, Martin J Pierman, Edwin W
Donath, Otto A Ernst, Illinois
Testing Laboratories (Alnor),
1969-08-26, 73/861.75; 73/861.76 - taught
band meter movement spring balanced vane (plate) in tunnel
all in one assembly that can be adjusted and tested prior to
assembly into meter. No batteries.
3557617
Vane anemometers, Alexander
Connor Wilson, Peter
Edward Bagley, Airflow
Developments Ltd, 1971-01-26, 73/861.85 - hand held
rotating vane with Veeder-Root
distance register
3636766
Velocity meter, Philip
R Austin, Contamination
Control Lab, 1972-01-25, 73/861.75 - pretty much
like a door with the hinge at the top, very simple to make from
sheet metal.
3638488
Fluid velocity measuring device and method, Robert
S Meijer, Alnor
Instruments, 1972-02-01, - modulation (audio?) and phase
measurement.
3719082
Air velocity measuring system, A
Obermaier, M
Pierman, Alnor
Inst Co, 1973-03-06, 73/202 - adds
range switch to purely mechanical system between probe and
meter. Has the look of an Acetylene welder mixing handle (Wiki).
3769835
Pitot calibrated air velocity measuring system with
transducer, A
Obermaier, M
Pierman, Alnor
Inst Co, 1973-11-06, 73/202 - range switch between sensor and
vane in tunnel meter
3826136
Anemometer device, N Chang,
1974-07-30, 73/861.85; 73/861.75; 73/170.15 -
4051725
Hand-held anemometer, Alden
Schloss, 1977-10-04, 73/861.76; 267/179 - wind direct acting on vane,
no tunnel.
4102188
Portable anemometer with collapsible rotors, R. A.
Simerl, Simerl Instruments, 1978-07-25, 73/170.01; 73/861.85 -
Related:
DE2824771A1
Portable anemometer with light weight rotor cups - has cup
support arms pivotally connected to spindle and collapsible
from active horizontal to vertical storage position, R A Simerl, 1979-12-13, -
D244203
Anemometer generator frame, R. A. Simerl, 1977-05-03, D10/103; D10/52; D10/96 -
D245970
Anemometer transducer, R. A. Simerl, 1977-10-04, - Savonius (Wiki)
instead of cups. Cylindrical case.
Calls:
2648980
Apparatus for measuring and recording the direction and
velocity of wind, Louvan
E Wood, Vernon
D Hauck, Bendix
Aviation, 1953-08-18, 73/170.07 - molded to look like a plane,
propeller for speed, tail for direction. Maybe the
"Aerovane" stype?
3465584
Anemometer with braking mechanism, Robert
E Turner, Dennis
W Camp, NASA,
1969-09-09, 73/861.8- testing in order to measure the
time for cups to come up to speed
3623362
Free-fall current meter, Robert
Daniel Gerard, Navy,
1971-11-30, 73/170.14; 73/170.34 - sinks to
bottom and returns to surface of ocean while recording water
currents.
3904984 Oram - type in number
D237951
Anemometer, R. A. Simerl, 1975-12-05, - Savonius see D245970
above. Rectangular case with normal meter movement. Looks
like Sims Anemometer on eBay.
GB1559761
Anemometers, 1980-01-23
FR2514143A1/en
Hand-held electronic anemometer - has Hall sensor coupling
rotating shaft to electronic circuit giving adapted scale
read-out to LCD
D244226
Combined top sender and bearing plate for an anemometer, R.
A. Simerl, 1977-05-03, D15/199 -
D247879
Anemometer transducer, R.
A. Simerl, 1978-05-16, D10/96; D10/60 -
Calls:
D215071
Anemometer integral cup and arm, David
M. Davis, 1969-08-26,
Calls:
3020963 Cup anemometer, Hakkarinen William,
1962-02-13, 416/196R; 416/196A; 416/197A;
416/197R; D10/96 - strong enough for hurricane
D237951
Anemometer, R. A. Simerl,
3020963 see above
3713336
Combination fluid flow speed and direction transducer, T
Bernstein, J Miller, 1973-01-30, 73/170.11; 73/170.08; 73/170.12; 33/351;
33/362 - direction relative to magnetic North.
4154101
Air velocity gauge, Steven
O. Buchanan, Robert
W. Butts, Dwyer
Instruments Inc, 1979-05-15 73/861.75; 73/272R - Vane in tunnel, 20 - 400 FPM,
4248082
Anemometer, D.
Eugene Farmer, 1981-02-03, 73/861.85; 73/861.78 - classic Taylor type
windmill vane type but with LCD readout. magnets turn in coil.
Calls:
3777121
Electronic Counter
3777263
Peak holding circuit
3805161
Apparatus for sensing speed - magnets and coils
3916326
Sensing circuit including polarity discriminator
3970935
Wide-range digital reluctance tachometer
4841782
Target fluid flow indicator gauge, Steven
O. Buchanan, Dwyer
Instruments Inc, 1989-06-27, 73/861.74; 73/DIG.5 - Magnehelic?
Patents for Dwyer Magnehelic:
3373614
Differential pressure gauge, Robert
D Neyer, Yarway
Corp, 1968-03-19, 73/716; 116/268 - magnetic coupling from
pressure vessel to outside
3397319
Differential pressure indicator and switch, John
P Locke, Dwyer
Mfg, 1968-08-13, 250/231.19 -
3645140
Pressure gauge, James
W Phillips, Richard
S Zoludow, Dwyer
Instruments Inc, 1972-02-29, 73/716 -
3862416
Pressure indicator and switch, James
W Phillips, Richard
S Zoludow, Dwyer
Instruments Inc, 1975-01-21, 250/231.11; 250/231.19 -
4011759
Differential pressure gauge, James
W. Phillips, Terrence
J. Troyer, Dwyer
Instruments Inc, 1977-03-15, 73/716; 73/DIG.5; 116/267-
4030365
Differential pressure gauge, James
W. Phillips, Terrance
J. Troyer, Dwyer
Instruments Inc, 1977-06-21, 73/708 -
4890497
Differential pressure gauge transmitter, John
M. Cahill, Dwyer
Instruments Inc, 1990-01-02, 73/708; 338/4; 73/721; 73/766 -
4347744
Diaphragm type differential pressure gauge with overpressure
relief protection, Steven
O. Buchanan, Dwyer
Instruments Inc, 1982-09-07, 73/715; 137/68.27; 137/71; 73/431; 73/716; 73/738 -
5012678
Overpressure relief safety plug for pressure gauges, Steven
O. Buchanan, Dwyer
Instruments Inc,1991-05-07, 73/738; 73/431; 73/756 -
6564652
X-wire probe for velocity measurements near the downstream edge
of an aperture, Paul
J. Zoccola, Jr., US
Navy, 2003-05-20, 73/861.85 -
page created 30 Jan. 2000.
