A combined shutter and projection device for the alignment of electrodes in spectrographic analysis

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Material Information

Title:
A combined shutter and projection device for the alignment of electrodes in spectrographic analysis
Series Title:
United States. Atomic Energy Commission. MDDC ;
Physical Description:
4 p. : ill. ; 27 cm.
Language:
English
Creator:
Smith, A. Lee
Fassel, V. A
Iowa State College
U.S. Atomic Energy Commission
Publisher:
Technical Information Division, Oak Ridge Directed Operations
Place of Publication:
Oak Ridge, Tenn
Publication Date:

Subjects

Subjects / Keywords:
Spectrum analysis -- Instruments   ( lcsh )
Spectrum analysis -- Technique   ( lcsh )
Genre:
federal government publication   ( marcgt )
bibliography   ( marcgt )
technical report   ( marcgt )
non-fiction   ( marcgt )

Notes

Bibliography:
Bibliography: p. 4.
Restriction:
"Date Declassified: June 12, 1947"
Statement of Responsibility:
by A. Lee Smith and V.A. Fassel.
General Note:
Manhattan District Declassified Code
General Note:
"Date of Manuscript: Unknown"

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 005024213
oclc - 277771838
System ID:
AA00009328:00001


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MDDC 1052



UNITED STATES ATOMIC ENERGY COMMISSION








A COMBINED SHUTTER AND PROJECTION DEVICE FOR THE ALIGNMENT

OF ELECTRODES IN SPECTROGRAPHIC ANALYSIS


by
A. Lee Smith
V. A. Fassel


Iowa State College I







This document consists of 4 pages.
Date of Manuscript: Unknown
Date Declassified: June 12, 1947


This document is issued for official use.
Its issuance does not constitute authority
to declassify copies or versions of the
same or similar content and title
and by the same authorss.




Technical Information Division, Oak Ridge Directed Operations


Oak Ridge, Tennessee


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Digitized by Ihe Iniernei Archive
in 2011 wilh funding from
University of Florida, George A. Smalhers Libraries with support from LYRASIS and the Sloan Foundation


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A COMBINED SHUTTER AND PROJECTION DEVICE FOR THE ALIGNMENT


OF ELECTRODES IN SPECTROGRAPHIC ANALYSIS





By A. Lee Smith and V. A. Fassel





It is well known that in quantitative spectrographic analysis the position and snacing of the elec -
trodes are quite critical if reproducible results are to be obtained. Proper alignment is usually
made by means of an auxiliary lens which projects the electrode image on a previously marked
screen.,'3 In some cases the electrodes are quickly positioned after the exposure has been started.
or for more careful work, the electrodes are aligned before arcing by the use of a lamp placed be-
hind the electrodes to project their image. Such a device requires manual operation of a lamp or
mirror, and if many samples are run the time consumed by this adjustment may be considerable.
The apparatus described here IFigure I) is almost instantaneous in action and is operated electri-
cally by conveniently placed push buttons. Furthermore, it provides an excellent shutter for spectro-
graphs not already so equipped. It operates on the principle that an iron rod placed in a solenoid
tends to center itself when current, alternating or direct, is passed through the winding.

The assembly is mounted on a 1 8 inch brass plate which is bolted to an optical bench carriage.
The double solenoid is made by winding enough No. 32 cotton-covered copper wire on a four inch
brass tube with bakelite spacers to give a resistance of about 80 ohms in each section IFigure 21.
The soft iron core,iour inches long and 1 4 inch in diameter, should slide freely in the tube. The
polished steel mirror is mounted on an arm which is free to rotate through a 45-degree angle, thus
swinging the mirror in and out of the optical path as the position of solenoid core changes. A .-pring
bears against the notched disk which is a part of the mirror arm, and in-ure-. the mirror's stopping
in the same position each time. A metal stop is placed near the edge of the base plate to limit the
motion of the mirror.

The lamp used on the Instrument described is 3 30 watt toy projecter bulb of type S-11. although
any similar lamp may be used: The socket is mounted on an insulated platform not shown in the
drawings which is fastened to the base. A cover may be placed over the lamp as indicated in Fig-
ure 3, or over the whole assembly (Figure II. with unstable holes cut for the optical path. Electrical
connections may be made by means of a tube socket mounted back of the lamp.

The wiring scheme is shown in Figure 4. The two sides ul the double solenoid are activated by
push buttons mounted in a convenient place.

The authors wish to thank Mr. Lael Smith for his as..islance in the construction of the instru-
ment.


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Fiaure 1. Assembly %ith cover removed.


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Figure 2. Top view of projector assembly.


Figure 3. Front view of assembly.










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Figure 4. Wiring diagram showing solenoid winding and push buttons.




REFERENCES
1. Brode, W. R., Chemical Spectroscopy, P 35, 2nd ed., John Wiley and Sons, New York, 1943.
2. Clayton, W. R., J. Sci. Instruments 18: 65 (1941).
3. Scribner, B. F., Spectroscopy in Science and Industry, P 32, John Wiley and Sons, New York, 1938.
4. Torok, Tibor, Spectrochim. Acta, 2: 300-302 (1943).


















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