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MODEL 722 for
Serial weighing Control of plating or enameling Counting of small parts
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Moisture control Soil investigation Rapid taring Recording botanical growth
< Reduces high capacity weighing time 50% and more > Clear, widely spaced divisions for quicker, more accurate direct readings > No fractional weights required > Practically instantaneous weighings > Mechanism fully protected from dust, fumes, chemicals, reagents as well as shock • Quarter turn locks beam and pointer for easy relocation without dismantling 8 capacities —select the correct range for your job
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AUGUST SAUTER OF NEW YORK,
INC.
866 WILLIS AVENUE ALBERTSON, L. Ι., Ν. Υ. Circle No. 26 A-1 on Readers' Service Card, page 101 A
26 A
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ANALYTICAL CHEMISTRY
as composed mainly of protons and alpha particles in a ratio of 6 to 1, having a total intensity of about 0.3 particles per sq. cm. per second. Other measurements have found that the particle energies range from 109 to 1017 electron volts with a resultant total incident energy about equal to that of starlight. Experiments of a similar principle have been flown in auroral zones in Aerobee-Hi rockets to measure particle composition and flux. Two types of particles have been found in the auroral sky: energetic [thousands of electronvolts (KEV)] hydrogen or helium ions and electrons of similar high energies. On an aurora-intercepting flight the electron flux increased when the rocket entered a visible display and diminished when it left. The ion flux, which re mained constant above 140 km., was unaffected by the presence or nonpresence of aurorae. However, upon entering the aurora, the electron flux energy (Figure 1) increased to a value of 30 to 100 times that of the ions. Distribution of both the ion and elec tron fluxes was very nearly isotropic over the upper hemisphere while the rocket was above 140 km. No high energy electrons were detected on flights which failed to intercept aurorae, and no low energy electrons between 3 EV and 1 KEV were detected on either auroral or nonauroral flights. Recently, U. S. satellites instru mented with Geiger counters have de tected high intensity radiation at 1000 km. altitudes. Current interpretation identifies the radiation as Bremsstrahlung produced by energetic electrons having many KEV of energy striking the satellite skin. Proton Precessional Magnetom eter. Another instrument which is beginning to play an important role in the probing of aurorae is the proton precessional magnetometer, a device which is capable of measuring magnetic field strengths to an accuracy of 10~5 gauss. These instruments have been flown in each of the rockets which car ried auroral particle detectors. Sharp discontinuities in the earth's field at auroral altitudes were detected on each flight, and are believed to be the result of high altitude patterns of electric current flow. Such phenomena are rather exciting and will be the object of much future investigation with both rocket- and satellite-borne equipment.
has more time for Valuable Research thanks to the SC H LUM B E R G E R NMR Analyzer The remarkable simplicity of the Schlumberger Model 104 NMR Analyzer allows routine moisture determination by non technical personnel, freeing the chemist from humdrum labor and giving him more time for creative work. Nothing approaches the speed and accuracy of this new form of spectrograph^ based on the principle of nuclear magnetic resonance. Once the instru ment is set up, just put in a sample, throw a switch, and read a scale—in less than a min ute your moisture determination is finished. The wide range of operational parameters of the Model 104 makes it, in the hands of a research chemist, a sophisticated analytical instrument for probing the make-up of matter. Schlumberger NMR analysis is non destructive, and the large. 40-cc sample size allows high sampling accuracy. Results are reproducible to within parts per thousand, and accuracy of 0 . 1 % , absolute, can be main tained. Industries where large numbers of moisture determinations are necessary can save considerably through the release of tech nical personnel for more valuable research with the very same instrument. For complete information, including the lat est material-study reports, and the address of your local Schlumberger Distributor-Service Organization, write to Department AC-9. RIDGEFIELD INSTRUMENTATION DIVISION
SCHLUMΒERGER WELL
S U R V E Y I N G
C O R P O R A T I O N
Ridgefietd, Connecticut
Solar Radiation. Solar radiation (Figure l)'has been observed by rocketborne optical instruments which have established the solar constant to be 2 calories per sq. cm. per minute, now the generally accepted value. Some of this energy is in x-radiation (about 0.1 erg Circle No. 26 A-2 on Readers' Service Card, page 101 A
