DEVELOPS NEW PHOTONEPHELOMETERS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600260754-6
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: August 4, 2011
• Sequence Number: 754
• Publication Date: November 15, 1949
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/09/13 :CIA-RDP80-00809A000600260754-6
7~ITOds3mya lnboratoriya. 19o i, 1y49. , llnformstlon req~:ceted. )
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Teo new photoaeFhelometers have been developed by the Gorkiy Phyeicotechaical
Research Institute. One of these instruments ie intended for automntlA: control of
calcium content in a saturated solution of common Dell, the other for determL-Aing
small quantities oP oulfntes Sn nlumin?ta prn-3er. In both cases, it was found ad-
vantageous :o use n differential circuit employing twc selenium photocells connected
in opposition, and n potentiometer Yor obtnint.>L+ x bnlnace ns shown by n zero-
galvanometer.
This instrument will measure calcium content Sn n range 1 - 5 milligrams of
calcium in a liter of saturated salt solution. tt consists of n light source, op-
tionl system, two parallel tubular ccataiaere (horizontally placed), txo photocells
(and diaphragms), a potentiometer, and a zero galvanometer. At electric bulb, with
n rheostat Por iatenei.ty control, serves ne the, light sour ;e for both sections by
means of mirrors and condensing lenses. After passing through the solatione In
the tubes, the light acts on the photocells. The Yralnt panel contains n voltmeter
for the ]amp circuit, a zero galvanometer, and n potentiometer dial.
In conductlag tests, it is first aeoeseary to zero the galvenometer by filling
both tubes xith purified brine and nd~neting the photoce~l diaphragms to n bnlanco
point. The loxer tube is then emptied and rafllied with the, test solution.
Equilibrium iu reetorod xith the potentiometer, xhoee reading gite6 the calcium
content oa n calibrntec~'graph. The filling and rofilling processes e+re carried
out by a eyeten of connecting tubes and etopcockh betxeen the instrumnnt and the
two tnn]ce of purifiefl brine and teat solution.
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CENTRAL WTELLlGENCE AGENCY REPORT N0.
It~1F0RMATI0N FROM
FORE{GN DOCUMENTS OR RADBO BROADCASTS CD N0.
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INFORMATION lyi~y
nerc DiST. s5" x..v 10149
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Sanitized Copy Approved for Release 2011/09/13 :CIA-RDP80-00809A000600260754-6
 Sanitized Copy Approved for Release 2011/09/13 :CIA-RDP80-00809A000600260754-6
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Sanitized Copy Approved for Release 2011/09/13 :CIA-RDP80-00809A000600260754-6
1n the range 0.05 - 1 milligram oP sulfate in 150 mlllilitera of solution at 0,05
milligram intervals. It can also ba used ae a photocolorimeter for determining iron
coaxtent (concentratic~a oY 0,005 - 0,05 milligrsm per 5~ mi11111tars of salution,
at 0,005-milligram inter~a].el and Por other el.aments.
The photonephslaneter F016-A7 Ss quite similar in construction to the FOLO-46
preeiously described, The main difference is in the Y-shaped placement of the two
tubes,, thnraby elitnfnating the need for mirrors in the optical system. The d1a-
phragmq'ln front of the photocells are used Por balancing the instrument when both
containers nre P111ed with "zeroing" solution. Set screws on the lamp holder per-
mit three-xay ad,~ust~nt.
CO1VF'I}9ETdTSAL
This instrument is used for determining the sulfate content in aluminus ponder
Phstca~amhelometer ~'ON-47
The 4natrimzent ie oqulppad with two types oY tubu]ar containers: (l) a
100-milliliter container for measuring turbidity, and (2) a p0-mi11111ter contalra;r
Por use in photocolorimster work. 7n the Former case, vary accurate results may ba
obtained in measuring the sulfate contont, while in the ]attar, it ie possible to
determine the iron con*.ent in half the time required Por pravicus lnetrumente.
50X1-HUM