MODEL II PROJECTED SCALE MICROMETER(Sanitized) OPERATION AND MAINTENANCE MANUAL

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002300060011-9
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 15
• Document Creation Date: December 28, 2016
• Document Release Date: October 19, 2011
• Sequence Number: 11
• Publication Date: July 1, 1965
• Content Type: MISC

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Model II
PROJECTED SCALE MICROMETER
STAT
OPERATION and MAINTENANCE
MANUAL
]BAUSCH & LOMB INCORPORATED
ROCHESTER, NEW YORK 14602
JULY 1965
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Projected Scale Micrometer
Operation and Maintenance
Bausch & Lomb Incorporated
Rochester, New York
July 1965
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I
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MODEL II PROJECTED SCALE MICROMETER AT
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I
The Model II of the Projected Scale Mic
measuring attachment for the Bausch & L
Zoom 70 Stereoscope or any Bausch & Lom
Microscope. The application of the Mod
to the Model I; however the design and
obtaining measurements is somewhat diff
digital counter is used in conjunction
screw and drum for making measurements.
screw drive is mounted in a stationing
main body.
The principle of operation is based on
splitting cube in association with a Zoo
Zoom Microscope such that a reticle may
simultaneously with a photograph. The m
is comparable with placing a reticle dir
with the photographic emulsion without p
quiring that it be done. The measuremen
independent of the viewing magnification
tortion in the optical system. The accu
solely on the precision of the micromete
The Model II of the Projected Scale Micr
to the base of the StereoZoom pod with t
the Model I. The mount threads into the
ment lens adapter and the unit attaches
ometer is a
mb Model II
StereoZoom
1 II is.similar
ethod of
rent. A
ith a micrometer
The micrometer
ocation on the
sing abeam
70 or Stereo-
e viewed
thod of measuring
ctly in contact
ysically re-
s obtained are
and any dis-
acy is dependent
screw used.
meter attaches
e same mount as-
auxiliary attach-
asily to the
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1
mount with one thumb screw. It is designed to be used
without the attachment lenses; therefore the magnifica-
tion range is 7x to 60x with one interch nge of eye-
pieces (10x and 20x).
1
measuring of distances up to 1/2 inch in length. A
negative reticle is used, clear lines with an opaque
background, which appear as luminous lines superimposed
on the photograph when viewed through the instrument.
The short line is used for measuring with the long line
-giving.the direction of the measurement. The reticle
is rotatable to permit orienting the long line parallel
with the direction of the two image points to be measured.
The reticle disc is 26mm in diameter. I has a 24mm
long line crossing the diameter with a 4 mm line bisecting
the center of the longer line. The reticle is displaced
parallel to the direction of the longer ine'through
+0.25 inches by a micrometer screw which permits the
A counter on the micrometer screw drive registers the
number of rotations of the micrometer screw and a drum
on the drive subdivides each rotation into 100 parts,
Illumination for the reticle is provide by a 12 volt,
.73 ampere lamp. The brightness of the luminous lines
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is regulated by a rheostat control on a transformer pro-
vided with the instrument. An opal glas diffuser provides
uniform illumination of the reticle. Interchangeable
colored filters may be furnished if other than white
reticle lines are desired; however, they are not included
in the basic instrument. The reticle lines are approx-
imately five microns wide. Increasing t e lamp brightness
increases the apparent width of the line g. The rheostat
provides a 50 per cent variation in lamp voltage which in
turn gives approximately a 100 per cent variation in the
apparent line width.
There is a total of +3/16 inches adjustment in the
optical path length to the reticle. This adjustment is
necessary to accommodate for variation in focus between
instruments and observers. A slow motion drive is pro-
vided for precisely setting the optical path length to
the reticle equal to the path length to the photograph.
The reticle may be rotated through a total angle of 190
degrees, allowing the reticle to be all ned with any
direction on the photograph. An azimuth ring attached
to the main body of the projected scale micrometer permits
the measuring of angles between lines o the photograph.
Attaching to the Zoom.70
An adapter ring is provided for attaching the Projected
Scale Micrometer to the Zoom 70. The adapter ring has
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the same thread as the auxiliary lenses and attaches in
the same manner to the base of the Zoom 0 pod. It should
be secured finger tight to the pod before attaching the.
micrometer.
The Projected Scale Micrometer is held
ring by three counter acting screws spa
around the mounting flange. It is nece
only the screw in the front to attach o
It should be attached with the counter
the micrometer and focusing screws to t
The main body of the Projected Scale Mic
in a spherical bearing which permits the
the micrometer such that one face of thi
cube is parallel with the stage. This i
to remove any apparent lack of parallel:
plane of the reticle and the plane of t;
imagery being viewed. Three socket heap
clamp the spherical bearing between mou
reticle is made to appear parallel with
photograph by loosening and tightening
screws while viewing through the instru
important that the bearing be clamped rigidly between
the plates after adjustment to assure
Removing and re-attaching the micromet
this adjustment; therefore it is neces
adjustment only when initially attachi
Scale Micrometer to an instrument.
o the adapter
ed at 120 degrees
sary to loosen
remove the unit,
o the front and
Le right.
rometer is supported
orientation of
beam splitting
otion is provided
sm between the
e photographic.
Allen screws
sting plates. The
the plane of the
Ldjacent clamping
lent. It is
stable setup,
r will not disturb
ary to make this
g the Projected
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1
Electrical Components
The Projected Scale Micrometer operates
special transformer with a 115 volt pri
volt secondary is supplied with the uni
has a rheostat for varying the secondar
6 and 12,5 volts to dim the projection
on/off toggle switch is mounted on the
The transformer has a 6 foot cord with
parallel blade plug for connection to a
The Projected Scale Micrometer plugs in
recepticle mounted on the side of the t
The projection lamp is a GE 212-1, 12 v
lamp with a rated life of 500 hours.
Orienting the Reticle
With the Projected Scale Micrometer att
the Zoom 70 should be focused on the ph
to be viewed. This should be done at t
zoom range.
After focusing the Zoom 70, the reticle
minated to make it visible in the optic
the slow motion screw which projects ho
the right at the rear of the instrument
until it appears in sharp focus and sup
plane of the photograph. Rotating the
may be helpful in determining if the re
plane of the photograph.
on 12 volts. A
ary and 12.5
The transformer
voltage between
amp. A main
ransformer housing.
two conductor
115 volt supply,
o a twist lock
ansformer housing.
ched to the Zoom 70,
tographic imagery
e high.end of the
.should be illu-
1 system. Using
izontally to
shift the reticle
rimposed in the
eticle slightly
isle is in the
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The reticle may be rotated through a total angle of
190 degrees to align it with any direction to be measured.
A clamp screw which projects up at a 45 degree angle
from the front of the instrument locks he reticle in
any rotational position.. To rotate the reticle, loosen
the clamp screw and rotate the main bod of the micro-
meter. Reclamp the housing before star ing to measure.
Do not hold onto the micrometer screw d ive knob when
rotating the main body.
Procedure for Measuring Distances
I
To measure a distance, the long line on the reticle
should be aligned with the direction to be measured by
loosening the clamp screw and rotating he.main housing.
Next turn the micrometer screw drive knob, to position
the short bisecting line on the reticle such that it is
aligned with the left or lower edge of he photographic
image to be measured. There is then a hoice of methods
to be followed in completing the measur meat.
(1) The first three digits on the counter are recorded
followed by the two digits from the drum reading.
The decimal point is to the left of the extreme
left digit on the counter. Then th reticle is
driven to the opposite end of the i age to be measured
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and the counter and drum are read again. The differ-
ence between the readings is the distance
(2) The second method is to note the las three digits,
of the counter reading. The decimal point to the
left-of-the right digit o The extreme left digit or
the counter will always be zero. The right counter
wheel is the opposite in color to the others and
indicatesthe decimal part of a 360 degree rotation
of the micrometer screw. Next the drum should be
indexed to zero without moving the reticle off the
left or lower end of the object. The reticle is
then driven to the right end of the object to be
measured. The last three digits on the counter
are noted and the first counter reading is sub-
tracted from-it. The difference represents the
number of rotations of the micrometer screw.
The advantages of the first method of reading are that
it doesn't matter in which direction the distance is
measured and the readings are made directly from the.
counter and dial without indexing; therefore it is less
subject to making an error in the reading. The second
method would probably be faster for an experienced
operator since it does not require the writing down of
I
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two five digit numbers and the subracti n of one from
the other. A mental subtraction of the two counter
readings could be made to determine the number of
thousandths to which would be added the drum reading,
giving the distance directly.
Regardless of which method is used, the image points
should be approached from the same direction with the
reticle drive to avoid errors due to the possible back-
lash in the drive linkage. Also, it'is recommended
that the intensity of the lamp for illuminating the
reticle not be increased beyond what is required to
make the reticle readily visible on the photograph.
The greater the intensity of the illumination the
greater will be the apparent line width.which will de-
crease the pointing accuracy. Less den a photographic
imagery will require higher intensities of illumination.
Procedure for Measuring Angles
1
The azimuth ring permits the measuring of angles up to
190 degrees. The ring is mounted on the main body;
however it may be rotated independent of the main body
to align with a stationary index mark. It is subdivided
in degrees with every two degrees graduated and every
10 degrees numbered throughout 360 deg ees.
To measure an angle the reticle should be in the center
of its adjustable range such..that the intersection of
the reticle lines has.. the least,appar nt motion when
the reticle is rotated. Place the intersection of the
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reticle lines at the junction of the images forming the
angle to be measured and align the long reticle line
with one of the directions. Rotate the azimuth ring to
index to zero or record the angle reading for the one
direction. Next align the reticle with the other direction.
If the first direction was indexed to zero, the angle is
read directly or is obtained by subtrac ing the reading
from 360 degrees. If the first direction was not indexed
to zero, the difference between the two directions will
give the angle.
Colored filters may be provided if it i desired that
the luminous lines appear as a color other than white.
The colored filters are inserted between the lamp house
and the diffusing plate. The lamp hous is unscrewed
from the instrument to install or remove the filter.
Replacing the Lamp
The lamp should be replaced by a GE 212 1 12 volt, .73
Amp lamp. It is accessable by unscrewing the rear section
of the main body. It is not necessary to remove the
plate on the back of the lamp house tha is held in'place
with two screws. The lamp is held in a fuse clip type
mount with a terminal at either end.
Care and Cleaning of Optics
The optical components should receive t e same care as
the optics in the Zoom 70. Care should be taken to
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avoid contact with the exposed faces of he beam splitting
prism. The faces may be cleaned with a cotton swab and
acetone or ether.
t
The diffusing plate is accessable by removing the lamp
housing that screws onto the end of the main body tube.
It is held in a metal mount that is retained in the main
body tube by two opposite acting set screws in the tube.
The mount may be removed by loosening the set screws,
tipping the tube portion of the housing own and tapping
on the palm of the hand until the mount 3lides out of
the tube.
Removal of .the diffusing plate mount provides access to
the reticle disc and its mount. The reticle disc is
held in the mount by a retaining ring. Under no circum-
stances should the reticle be cleaned with any solvent.
Since the reticle-is opaque with cleared scale graduations
the only cleaning that should be required is dusting
.lightly with a camel hair brush.
Mechanical Maintenance
The only routine mechanical maintenance required is to
keep dust and grit from accummulating o the exposed
moving parts of the instrument. No lubrication is re-
quired. Teflon thrust faces have been used on bearing
surf aces to reduce friction. The micrometer screw has
been lubricated with a light grease in assembly and is
protected from dirt and grit for normal operating environ-
ments. It should not require additions lubrication for
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long periods. Under no circumstances should the micro-
meter screw be disassembled in the field since the
alignment of the drum linkage is critical for smooth
operation. The instrument should be s ored in its
carrying. case when not in use.
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