22 A
ANALYTICAL
CHEMISTRY
AVAILABLE There's nothing like it for
ACCURACY SPEED ECONOMY in your laboratory!
KERN LK 30
INSTRUMENTATION
REPRINTS OF Reviews
reet damping to prevent oscillation or Undue slowing of approach. The inputs can be derived from strain gages, thermo couples, phototubes, electronic circuits, or computer outputs. A general view of the instrument is shown in Figure 2. A few typical applica tions are shown in Figure 3. The curve at the top shows the completely automatic thermal analysis of a clay sample. The ordinales represent the temperature and the abscissas the difference in temperature between the clay and some thermally indifferent substance. Three analytically significant inflections are apparent in this curve. A differential thermocouple sup plied the ,V input, and the )* input was connected to a thermocouple which fol lowed the slowly increasing furnace tem perature.
Micro-electrophoresis Apparatus
and Symposia from ACS Publications
Materials of Construction 1st 2nd 3rd 4th
Invaluable for your laboratory, to make accurate quantitative analysis of exceptionally small amounts (0.4 ml.) of solutions containing high mo lecular weight substances, includ ing solutions of considerable turbid ity. .. with a standard deviation of ± 1.1% using a 1.5% solution!
REVIEW REVIEW REVIEW REVIEW
. . . #R-4 . . . $0.50 . . . #R-14 . . . $0.75 . . . #R-20 . . . $0.50 . . . #R-30 . . . $0.75
1st REVIEW . . . #R-13 . . . $0.50 2nd REVIEW . . . #R-19 . . . $0.50 3rd REVIEW . . . #R-28 . . . $0.50
/ Accurate / Rapid
3rd REVIEW . . . #R-10 . . . $0.50 4th REVIEW . . . #R-15 . . . $0.50 5th REVIEW . . . #R-22 . . . $0.50
/ E a s y to operate / C o m p a c t l y constructed
Analytical
/ Versatile
1st REVIEW... #R-16... $1.50 2nd REVIEW . . . #R-24 . . . $1.50 Items R-16 and R - 2 4 . . . $2.50
Eliminates long computational With the LK 30, the data are easily evalu ated and interpreted... the complete analysis within Vh hrs. from start to finish! The LK 30 dimensions are only 16" χ 19" χ 12"—weighs 53 lbs. All parts readily accessible. Mirrors and lenses cannot shift. .. they are welded into position to eliminate recementing nuisance! Can be operated by untrained per sonnel on slight briefing. Diffusion measurements can also be taken with the LK 30 by making a simple adaptation. Get the full details about the Kern LK 30 by writing to
KERN
COMPANY
5 Beekman St., New York 38, Ν. Υ.
Chemistry
Symposia
Figure 3. Typical Applications The second chart illustrates the auto matic recording of vacuum tube character istics. In this example the plate currentplate voltage curves are drawn in for sev eral fixed grid-cathode voltages, showing the typical behavior of a pentode. The third curve illustrates the currentvoltage curve of a selenium rectifier in the forward and reverse direction. T h e fourth chart, which is drawn from a metallurgical application, more nearly (Continued on page 24 A)
Absorption and Extraction . . . Adsorption Atmospheric Pollution . . . . Sulfur Titanium
#R-26 . . . $0.75 #R-27 . . . $0.50 #R-21 . . . $0.75 #R-31 . . . $0.75 #R-23 . . . $0.50
Key to year of publication: 1 9 4 7 - - R-l through R-9. 1 9 4 8 - - R-10 " R-15. 1 9 4 9 - - R-16 " R-21. 1 9 5 0 - -R-22
ORDER FROM: Special P u b l i c a t i o n s Dept. American Chemical Society 1155—16th Street, N.W. Washington 6, D.C.
