LETTER(Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002600100014-9
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 12
• Document Creation Date: December 28, 2016
• Document Release Date: November 19, 2002
• Sequence Number: 14
• Publication Date: July 16, 1965
• Content Type: LETTER

STAT.
STAT
Your inquiry of July 12 and the enclosures which
you sent make most interesting reading. It may be that our
pressure inking system may have application to your equipment.
Enclosed with this letter you will find a copy of
U. S. Patent Reissue No. 25,692 under which we manufacture
the inking system which we use on our recording equipment.
To inform you further I am also enclosing some literature
describing our products which use pressure ink marking.
system to your equipment without actually seeing it at firsthand.
For this reason, by copy of this letter, I am requesting Mr.
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I have the feeling that it will not be possible for you
to decide as to the applicability of our pressure ink marking
our general sales manager, to arrange to have
one of our sales engineers contact you for the purpose of
arranging for a demonstration. We have an office in
STAT I Iwhere you may see our recording equipment in
action. According to your wishes, you may do that or have one
of our men demonstrate a portable unit to you in your
office.
When you have ascertained the degree of your further
interest, I will look forward to hearing from you again. In the
meantime, please be assured of our earnest wish to cooperate
with you.
STAT
STAT
Declass Review% `T
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 CPYRGHT
Am Ask
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-brush
RECORDER
MARK
200
Forced fluid writing, true rectilinear pen
motion and pen-position feedback provide
records of unparalleled accuracy and clarity.
This article details how these innovations
contribute to the direct writing medium.
_-~ PRESSURIZED
SHUT OFF
CONTROL
AMPLIFIER
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RECORDER
M
(11x I\6~
200
A Totally
NEW
Recorder
CPYRGHT
IN the fast-growing electronics industry, the word
"breakthrough" is widely used and abused. The con-
scientious reporter hesitates to use it. Yet, when a
new product incorporates not one, but four significant
technical advances and exhibits a level of performance
never before achieved, the hackneyed word is difficult
to avoid.
The Brush Recorder Mark 200, a revolutionary new
direct writing system, is a true breakthrough. Not
since the introduction of the d':Arsonval penmotor has
the direct writing recorder seen comparable advances
in all five major parameters --- accuracy, resolution,
clarity of records, operating economy and efficiency.
First. accuracy. Newly conceived pemnoturs utilize
the proprietary Brush Metrisite transducer for position
feedback control and eliminate the mechanical re-
straint of the conventional torsion rod for zero return.
The penuiotor coil, supported only by precision ball
hearings, rotates freely in a constant magnetic field.
The pen position is continuously sensed by the 1letri-
site and compared 'against the input signal command.
if the pen position is incorrect. the difference between
the L1etrisite output and the input comncnand produces
an "error" signal which is amplified and applied to the
penmotor until the correct position is reached. Accuracy
of the pendrive system approaches 1i percent.
Taking all other error-factors into account - ampli-
tiers, pen linkage, chart drive and residual system
errors--the Mark 200 exhibits a remarkable over-all
system accuracy of one-half of one percent. This applies
to high-speed pen motion as well as to low-frequency,
or static recording.
Second, resolution. Traces produced by the Clark 2011
have a Iixed, uninterrupted width of approyin,ately
.010"---about ? chart division -up to highest writing
speeds. 't'hese thin, sharl, traces enable the engineer
to read and interpret higl, speed transients or %ery
slight pen movements with great exactitude. fully
closed, pressurized ink delivery sy stern writing on a
high-gloss paper makes possible an exceptionally line
trace which cannot be smeared. is proof against clogging
or spattering.
Record Clarity depends on cleanness and contrast of
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 CPYRGHT
s .
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the written record. Mane engineers find it easier to co-
ordinate multi-channel rectilinear, rather than enrvi-
linear, traces with the graphs and charts with which
they normally work. In most oscillographic recorders
this is achieved by means of a heated stylus writing
on heat sensitive paper pulled over a knife-edge, with
some loss in linearity. A unique pen-linkage in the
Mark 200 system completely cancels such errors, and
produces true rectilinear motion at the pen tip. Records
appear in solid blue on pure white paper, for utmost
visibility and contrast. ReproducibilitN by common
methods is good.
Operating Vconornp and (fficlency. The Recorder
'dark 200 uses ink-writing paper costing less than one-
third that of comparable heat writing or electric writing
A To#a1'b' NETW Pena',; ,: . tip
The section of recorder chart below is reproduee,i as
faithfully as possible from an actual chart made to tar
the Mark 200 writing capacity to the uttuast- Note-
worthy, are the uniformity of the trace, especially at
w ide pen excur-ion; the rule-straight error-free tray erne;
the absence of "sio%do%n" or "overshoot" a- the pens
uddenly ( badge direction.
I'riruarily respotible for these near-perfect trace. is
a writing system as simple in concept as it is unique.
{ i ice}
Approved For Release 200
paper. Thus the economy of ink-type papers i. com-
bined with tticu important advantages--rectilinear pres-
entation and bug term unattended operation. ( tperation
%vrsu.-, downtime ratio is eatreniely high: chart paper is
used in 501)-foot rolls and it single ink cartridge provide.
for an average six month, of daily use. "l'Ire inking
systein will not clog, is always ready for operation even
after several months' shutdown- Pushbutton control,
for all recorder functions including calibration further
simplify operating and reco-ding procedures.
The \1ark 200 is an integrated sv-tern. including
amplifiers, signal conditioning equipment and recorder
in a mobile console configuration, ideal for analog com-
puter readout. telemetry, test-stand or laboratory
application;.
For the first titre a l,ra(tical pressurized fluid inking
system has been achic ed in a direct writing recorder.
To evaluate the achievement, imagine what happen,
when fluid tender significant positive pressure is forced
through a pen aperture measuring .010" in diameter.
In effect, the answer was a miniature closed hydraulic
system with external delivers controlled by pen move-
ments
Figure 1 shows the fluid source, an aerosol cartridge
 Aft
Fig. I ApprovedCForrgRelease 20~03/01d/28 :
mounts in rear of oscillograph. Single supply
feeds all pens.
holding a supply of yiscrn-s writing fluid under prt.Ilre,
mounted in the oseillograplt cha?is.
Front here the fluid pa,ses forward to a inanifold.
thence to the recorder's eight analog pen, and two
e,.cut-marker pens whirl- deposit the fluid directly on
the chart paper, as shown in Figure 2.
To assure controlled delivery and to prevent spurting
at the writing point, a balance of force, is at work. Pen
pressures nian~ times higher than normal for eon-
-ventional svstetns are required to contain the fluid laid
down on the chart.
The higher pen pressures iuiltose three further con-
sideration.. One is design of the pen itself. Structure
is extremely rigid and reinforced against possible twist-
ing at rapid traverse. The second is the requirement
for snore powerful peninotor,s and amplifiers to oNer-
tolne increased inertia. A third i. greatly increased
penntotor still'nes , to offset frictional factors, obtain-
able only through a position feedback system.
"Thus, the writing system is inseparable from the
electro-mechanical pendriye mecltaninut. The entire
recording system is in fart an integrated eleetro-
ntecl-anical-hydraalic s~stein which is inherently simple
and ragged. .ldyantagea, aside from visual clarity and
high resolution, include eyreptional accuracy in both
static and d%nan-ic recording; long-term unattended
operation; low-cost chart paper; minimum downtime
for ink t plenishu-rnt; greater chart capacity. Added
to this is the -nost important of all recording system
re"luircmrnts, reliability.
Fig. 2-- Four of the Mark 200's eight analog pens. Event-m,irker pen at right.
All draw fluid from single manifold.
--gush INSTRUMENTS
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 Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600
MEMORANDUM FOR:
(DATE)
FORM NO. REPLACES FORM 10-101
I AUG 54 (QI WHICH MAY BE USED.
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 Approved For Release 2003/01/28 : CIA-RDP78B04770A002600100014-9
MEMORANDUM FOR:
FORM
US10-101
AUGH 54 101 WHICH RELACES FORM
ED.
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 Approved For Release 2003/01/28 : CIA-RDP78BO477OA00260010
Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600100014-9
 Approved For Release 2003/01/28 : CIA-RDP78BO477OA002600100014-9
MEMORANDU FOR:, r2~l~G~
,o7
F~rs,~ tJU-~-3r
(DATE)
RM NO. IQI REPLACES FORM 10-101
AUG 54 WHICH MAY BE USED.
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