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'W shopping for anon-overload linear amplifier?
Our new Detectolab* DA8 is an off-the-shelf in-strument which
we've been told is an extremelywelcome addition to the field of
general spectro-scopy ... or even as our friend Sherman
succinctlyputs it ... specific spectroscopy.Higher amplifier gain,
resolution, linearity and
overload factor are but a few features which set thisinstrument
above currently available models.
Overload factor is 4000 times with 7 microsec-ond recovery rate,
making the DA8 especially ap-plicable for use with larger radiation
detectors.Additionally, amplifier gain is 70,000, either posi-tive
or negative output pulse to 135 v and linearitybetter than 0.1%.
Resolution is 1.0 microsecond.The Detectolab DA8 permits ready
observance
of low energy x-rays in the presence of energeticgamma radiation
and is available with pre-ampand pulse height selector.A new
technical bulletin excruciatingly describes
all aspects of the DA8. Yours for the asking.
,§.XsBJ ELECTRONICSl~l qBORG-WARNER CORPORATION
Reliability you can count upon*Borg-Warner Corporation
Trademark
3300 NEWPORT BOULEVARD, P. O. BOX 1679, SANTA ANA,
CALIFORNIAEXPORT SALES: BORG-WARN ER I NTERNATIONAL CORP., CH
ICAGO, I LLINOIS
734
EquipmentThe information reported here is obtained
from manufacturers and from other sources con-sidered to be
reliable. Science does not assumeresponsibility for the accuracy of
the informa-tion. A coupon for use in making inquiries con-cerning
the items listed appears on page 738.
° TESTING MACHINE of 100-lb capacityis accurate within ± 0.5
percent of indi-cation. Tensile, compression, transverse,or shear
tests can be performed. Loadmeasurement is provided by a
calibratedpendulum. Draw-bar speeds up to 20in./min are selectable.
Standard gripclearance is 14¾4 in. Output is a re-corded curve. (W.
C. Dillon & Co., Inc.,Dept. 354)
E RING LIGHT SOURCE is designed to pro-duce "cold light"
shadowless illumina-tion of small objects for low-power
mi-croscopic inspection. The light is 2.5 in.in diameter with a 1
4-in. aperturethrough which the specimen may be ob-served. (Aristo
Grid Lamp ProductsInc., Dept. 356)
* SOIL CONSOLIDATION TESTER applies amaximum pressure of 20
kg/cm2 on aspecimen 2.5 in. in diameter. Accuracyof the
counterbalanced lever system usedto adjust the load is ± 0.5
percent. Theapparatus is portable. (Soiltest Inc.,Dept. 358)
* PULSE-HEIGHT ANALYZER consists of a100-channel
analog-to-digital converterand 20 channels of
glow-transfer-tubestorage. Any 20-channel group may beselected for
data storage by means of asingle switch setting. Linearity is 0.5
per-cent, and dead time is 500 jisec. Theinstrument contains all
components nec-essary for a complete scintillation spec-trometer
except a phototube and crystal.(Tullamore Electronics Lab.,
Dept.359)
* GLOW-DISCHARGE UNIT for cleaning sur-faces preparatory to
vacuum coating iscapable of delivering 400 ma at 5000 vd-c. This
output is large enough to per-mit use in a 48-in. coater. Current
is lim-ited by a transformer that delivers ap-proximately 90
percent of input powerat full load. (Consolidated Electrody-namics
Corp., Dept. 360)
* PRINTER accepts parallel or serial inputand prints from six to
nine columns ofdigits in one or two copies. Output ratefrom
parallel input is three lines per sec-ond; from serial input, four
digits persecond. An optional feature provides thatthe line to be
printed is visible beforeand after printing. Paper slippage is
lessthan 1/16 in. in 20 consecutive horizon-tal lines. The first
copy can be torn offat any time. (Taller and Cooper Inc.,Dept.
361)
SCIENCE, VOL. 128
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* RECORDING POTENTIOMETER can beadapted to handling from 2 to 24
chan-nels by means of plug-in adapter units.Change to a different
work load requireschanging a plug-in unit, a dial indicator,and a
print wheel. According to themanufacturer, this change can be
com-pleted in 3 min. Adaptation to varioustransducers and change of
range can alsobe simply accomplished. Accuracy is 0.25percent.
(Weston Instruments Division,Daystrom Inc., Dept. 364)
* FLUTTERMETER permits fine adjustmentof recorder drives. To
measure flutter, aprerecorded nominally 1000-cy/sec sig-nal is
played through the recorder. Thefluttermeter amplifies frequency
modu-lation of the signal by the recorder andindicates percentage
of variation on itsoutput meter in two ranges: 0 to 1.5and 0 to 3.0
percent. Sensitivity is bet-ter than 30 mv. (Kay Electric Co.,
Dept.365)
* ACID PUMP of polyethylene attaches to5-pt reagent bottle. Acid
is delivered at1000 ml/min by light, rapid squeezes ofa plastic
bottle that is part of the pump.Pressure on a relief valve stops
flowwithout drip. (Fisher Scientific Co.,Dept. 366)
* PERFORATED TAPE READER is transistor-ized. The device will
read five-, six-,seven-, or eight-level tapes at rates upto 1000
characters per second. Startingtime is 3 msec, stopping time 0.2
msec.Tapes are read by photodiodes. (PotterInstrument Co., Inc.,
Dept. 362)
* MELTING-POINT APPARATUS provides forsimultaneous viewing of
five capillarysamples in a well-lighted, unobstructedfield. A
standard beaker is used as a con-tainer for the silicone-fluid
heating bath.Electric heating is controlled by an auto-transformer.
A compressed-air fittingpermits connection to an air line forrapid
cooling. Capillaries are vibratedto insure uniform packing of the
sample,and an adjustable stirrer provides uni-form bath
temperature. (Arthur H.Thomas Co., Dept. 383)
E VACUUM LEAD-THROUGH TERMINAL iscomprised of a high-alumina
ceramicinsulator fused to a metal lead-throughpin. The terminal is
designed to be usedwith soft solders or with hard solders
attemperatures up to 1400'F. Various pinconfigurations are
available. (ThermoMaterials, Dept. 371)
° RECORDER plots "on" time against totaltime on a 6- by 14-in.
chart mounted ona drum. An accessory base provides digi-tal display
of the same information.(Gorrell & Gorrell, Dept. 375)
JOSHUA STERNNational Bureau of Standards26 SEPTEMBER 1958
Here's how! ATo measure and control clarity ofliquids: Whiskies,
Beers, Wines, Soft Drinks,Pharmaceuticals, Liquid Sugars and
Syrups, In-dustrial Chemicals, Industrial or Potable Waters.
To measure filter efficiencies; Bacterialgrowth rates;
contaminants in water.
To determine Calcium, Magnesium,Sulfates and Chlorides as well
as similarions-in trace amounts-without filtering, wash-ing, drying
or weighing of precipitates.
The Coleman Nephelos System is based on a setof permanent,
numerically related Nephelos Standards anda photoelectric
instrument which is strictly linear in itsresponse to scattered
light, even at intensities far below thevisible level. Two
instrumentsare available: The Model 7Photo-Nephelometer for
nephe-lometry only, and the Model 9Nepho-Colorimeter which
incor-porates an excellent filter-pho-
tometer system.
NEW! Write for Bul-letin B-246, describ-ing Coleman
CertifiedNephelos Standardsand Coleman preci-
sion nephelometers.
* £_0
COLEMAN INSTRUMENTS INC., DEPT. S., MAYWOOD, ILLINOIS735
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EquipmentJOSHUA STERN
DOI: 10.1126/science.128.3326.734 (3326), 734-735.128Science
ARTICLE TOOLS
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1200 New York Avenue NW, Washington, DC 20005. The title
(print ISSN 0036-8075; online ISSN 1095-9203) is published by
the American Association for theScience
Advancement of Science. No claim to original U.S. Government
Works.Copyright © 1958 The Authors, some rights reserved; exclusive
licensee American Association for the
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