Suppose a normal beam Weissenberg photograph has been taken of the hth layer line of a
monoclinic crystal rotated about its a-axis.-4 straight line is ruled on a strip of transparent
material and this is laid horizontally across the chart at the appropriate height, xhich in this …

Page 1. Journal of Scientific Instruments The Control of Humidity by Saturated Salt Solutions
To cite this article: FEM O'Brien 1948 J. Sci. Instrum. 25 73 View the article online for updates
and enhancements. Related content The control of conditioning atmospheres by saturated …

Electrons with a mean energy of a few electron volts emerging from a source a few
millimetres in diameter are accelerated on to a positively biased plastic scintillator. The light
generated in the scintillator is guided by a Perspex light-pipe to a photomultiplier. If the …

A complete calibration has been made for the first time of the method of detecting and
measuring airborne droplets whereby the permanent impressions made when they strike a
layer of magnesium oxide smoked on a glass slide are measured microscopically. A size …

An improved membrane protected galvanic cell oxygen-temperature probe is described. The
device produces a high electrical output and displays great stability of sensitivity to oxygen
over long periods of use. It is used to determine or record oxygen concentrations in liquids or …

An improved net radiometer using very thin hemispherical polythene windshields is
described. Balanced radiant heating of the windshield prevents formation of dew. Two of
these instruments, suitably matched, permit direct measurements of radiative flux divergence …

A new instrument is described which will sample windborne and stationary aerosols such as
natural fogs and clouds, fine sprays, insecticidal mists, coarse dusts, pollen and spores, etc.
By means of four progressively finer jets impinging on glass slides in series the sample is …

Page 1. Journal of Scientific Instruments Nuclear resonance absorption circuit To cite this article:
FNH Robinson 1959 J. Sci. Instrum. 36 481 View the article online for updates and enhancements.
Related content On matching a nuclear resonance circuit to an amplifier with an application to …

The bubble meter technique is an absolute method of measuring the volume flow rate of
gases. It requires accurate standards of mass and time only and is simple in application.
This paper describes the method, examines its potential accuracy and derives criteria for …

It is often necessary to know the visual range orvisibility'at times when a direct observation
onvisibility marks' is not possible. This note describes a series of instruments of small size in
which the visibility is measured by measuring directly the scattering coefficient of a relatively …