The Washington herald., 1921-05-08

brasses molybdenum glass and the alloys used in
toothhng measured The bureau tests scales
in railroad centers and checks mine and grain scales by
using special scaletestng automobes Gauges used
troll the manufacture of interchangeable machine parts
large scale in the industries, calibrated
Heat standards and heat constants determined by
the division of heat and thermome which also heat
measuring apparatus Clinical thermometers hermocou
PIES promoters and other temperature measuring devices
from the ooldest possible temperature to the highest obtain
able temperatures caibraed Fundamental physical
stants Of materials used in refrigeration have been deter
mined and the temperature laboratory has made and
studied properties of liquid air. carbon doxde aceylene
hydrogen and oxygen Building columns have been fire.
tested high temperatures To find out how arpane
engine behaves high attitudes laboratory in which all
the conditions of upper air flying be duplicated has
been built Fundamental problems of design and operation
of nternacombuston engines and accessories such
fabrication of engines cooling carbureon, ignition and the
phenomena of combustion, being studied. Data
fuels being compiled.
Light and optical problems handled by special d
vision method of phoograpns through haze by
of red light developed by the spectroscopy section
which is also working photosensitizing dyes photo
graphic emusons and other special Investigations Polar
lied light and its properties have been Investigated and
by means of sugar and oils tested The coorimetry
work deals with the light frequences waveength and
their ntcnstes that produce the sensation OF color Tests
of optical instruments are made Glasses that protect the
eyes from injurious radatons studied Searchights
tested during the war.
In the chemistry division many tests Of materials
for composition and purity in connection with re-
searches upon methods of analysis specifications for
technical materials and preparation of pure materials
for standardza work made. Investigations OF
eectroplatng have been made and methods OF anayz-
ing fuel and illuminating gases have been developed
Chemical reagents platinum, lubrcatng oils rubber,
paper textiles, ink glue, airpane dopes are tested
and other sections anayze ron Steel nonferrous metals
alloys lime, plaster cement bituminous materials,
paint, varnish and soap
Investigations relating to mechanics and sound, the
testing and development of engineering instruments,
experimental development of aircraft instruments and
the analysis and correction of accoustcal defects of
assembly rooms undertaken by the division of en-
gineerng physics In long tank of still water water
current meters are rated. Various aeronautic inru-
ments have been developed The resistance of pro-
jectles high air speeds and the aerodynamica char
acterstics of tiny apane models tested in tunnels
with air speeds up to $50 feet a second.
Nearly all the materials ordinarily used IN indus
trial work investigated and tested by the division of
structural, engineering and miscellaneous materials.
Among the tests that have been made strain
gauge measurements, of 3soton crane efficiency tests
Of oxyacetyene torches fof Welding and cutting, fire.
proof qualities Of aplane wings effect Of acid rope
strength Of metal fenceposs and physical properties