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ATOMIC ENERGY COMMISSION
QUARTZ FIBER MICROBALANCE
Argonne National Laboratories
- aitlihed for use within the Atomic Energy Commission. Inquiries for additional copies
l:ia any questions regarding reproduction by recipients of this document may be referred
Hia lte Documents Distribution Subsection, Publication Section, Technical Information
iii anchAtomic Energy Commission, P. O. Box E, Oak Ridge, Tennessee.
A:ismi h as a declassified document may differ materially from the original classified
agimient by reason of deletions necessary to accomplish declassification, this copy does
iput : astitute authority for declassification of classified copies of a similar document
i:d ith smay bear the same title and authors.
te of Manuscript: Unknown
mentDeclassified: January 14, 1947
casists of 3 pages.
t H, ~
1 MDDC 885
QUARTZ FIBER MICROBALANCE
This microbalance indicates by a calibrated dial and vernier the amount of torsion
necessary to bring the known and unknown weights into balance. One division on the ver-
i aier is. Axl09 grams. The maximum load per pais about 20 milligrams.
S.i!!iF? The suspension or torsion fiber, beam, and pan holders are of fused quartz construc-
t:I ::I II The suspension fiber is about 2.3xl0'0 centimeters in diameter. Two small platinum
Spans hold the materials to be weighed. The unknown is balanced as closely as possible with
' :iai:own weights. In balancing, the oscillation of the beam damps out within 2 to 3 seconds.
Wen, one end of the suspension fiber is rotated until the balance is perfect. The amount
di :rotation is indicated on the dial and vernier.
An optical system is used for observing exact balance. Two lamps with exactly centered
laments throw onto prisms the images of two segments of the index fiber. This index fiber
is above the beam and parallel to it. The segments chosen for viewing are near the ends of
the beam. Through a system of reflecting and combining prisms, the images of the index
efib are shown on a viewing screen for rough balance and may be viewed through an objec-
tivelens for exact balance. When viewing the balance through the objective lens, one sees
a magnified image of the vernier in the left upper third of the field.
SThe accuracy is limited by temperature changes and by vibrations. Temperature
changes are minimized by a set of 3 housings with dead air spaces between them. For ex-
treme accuracy, the instrument should be used in a temperature-controlled room.
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