An improved method and apparatus for measuring imbalance of a rotary test body whereby the imbalance vector signal generated by a conventional wheel balance machine is split into rectified components and integrated to eliminate residual waves and interference frequencies, the integration time being extended with increasing measuring time. A logic element, for example, a field effect transistor, connected between the vector splitting circuit and integrator is alternately rendered conductive and n...

Calcium as, e.g., contained in solutions or body fluids, is determined by contacting same with a novel reagent comprising a solution of murexide (acid ammonium purpurate) in at least one polyvalent (including bivalent) alcohol containing sufficient alkali metal alcoholate to have a pH value of from 10.5 to 13 in aqueous solution.

This invention relates to a device and method for measuring the amount of radon present in the air. A silicon diode detector system operates in helium at atmospheric pressure, and an alpha spectra is obtained that can be analyzed for the radon activity. The invention facilitates radon concentration measurements in the many widely scattered localities in the biosphere where these measurements are of interest, such as in uranium mines, coal mines, and in the lower atmosphere.

Method for the determination of thyroxine in biological fluids by adsorption on a cation exchanger, subsequent washing out of the interfering components, eluting the adsorbed thyroxine, liberating the iodine therefrom, and then carrying out the iodine determination in a conventional manner, which process is characterized by the use of an eluent, optionally together with a basic buffer, which destroys amino groups and liberates iodine from the thyroxine into the eluate.

An illustrative embodiment of the invention provides an accurate mudcake correction for sidewall neutron borehole logging tools. A sidewall porosity sonde is equipped with a vertically separated neutron source and a neutron detector that are both eccentered in the tool in order to engage one side of the borehole wall. This basic porosity measuring array is supplemented by a source of lower energy neutrons having appreciably shorter slowing down length and another detector, for appropriately sens...

3-(2-PYRIDYL)-5,6-BIS(PHENYLSULFONIC ACID)-1,2,4-TRIAZINE AND CERTAIN SALTS THEREOF, E.G. SODIUM, ARE PROVIDED TOGETHER WITH A METHOD FOR FORMING SUCH COMPOUNDS. These compounds are useful as reagents in the spectrophotometric determination of iron in water or other solutions.

A diluted blood sample is passed through a blood cell sensor of the type that provides an electric pulse having a peak amplitude corresponding to the volume of each sensed blood cell and a pulse width corresponding to the instantaneous flow rate of the blood sample through the sensor. The pulse amplitude is monitored and when the pulse peak is sensed, a signal corresponding to the pulse peak amplitude is stored and provided to a gate. A predetermined portion of the pulse width is detected and a ...

For ascertaining the linear dichroism of a material when subjected to an electric, magnetic, hydrodynamic or acoustic force field, the invention proposes applying such a field to a sample of the material in a cell coincident with a beam of monochromatic and parallel light of predetermined wavelength and obtaining a signal representing such dichroism (referred to in the specification as "longitudinal dichroism") from a photoelectric cell, photomultiplier or other photo-detector, whereby polarisat...

This is a new way of compositing multifold common-depth-point data from seismic prospecting operations to improve the making of static corrections, particularly when determining velocity. Such static corrections eliminate time differences in arrival of reflected seismic events on the various traces of a seismic spread due to differences in thickness of the low velocity or "weathered" layer below the geophones, to differences in surface elevation, and the like. Seismic waves are generated success...

An agent for the colorimetric determination of calcium, containing a color reagent, which forms complexes in the presence of calcium ions, and a buffer system which consists essentially of a mixture of amidosulfonic acid, disodium tetraborate and alkali carbonate.