Observations of the improvement in vision brought about by the application of a rain-repellent lacquer on an airplane windshield Page: 2 of 9
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1 3 1176 01403 105
POSITION 07 OF T HE IMPROEM NT IN VISION
BROUGHT A OUT BY THE APPLICATION OF A AIN-RPLLN
,ACQ UZI AitiptiflVIDB E I -
Dy Wilitia t. oaon and"Lawroe nceA.Clousing
- . *NRODU T ION ' - - .
A rain.repeflent LadQuer wase"isubmitted-to the tatiofal
Advisory Committee- fo erbonhutice btyaot&Xn t. H. RalTerer,
of Lorr Laboratorie, an-preliminary testu ahd observations
have been made to determine itsvalue in ihpro.ig the vi..
sion through airplane windshield. during rain. The tests
and observations were carried out at Ames Aeronautical
Laboratory, Moffet ' Field, California, over period-of
about a weeks The results are reported herein.
DESCRIPTION 01H TEl LACOQUE
The lacquer when applied consisted of a very thin,
transparent film that-could be distinguished with diffi.-
culty on a glass surface. It was apparent, however, to
the touch anti when light struck it at a certain angle,
alight interference refraction appeared in the reflected
light. When looking through glass to which the lacquer
had been applied, a line of demarcation vwae pparent at
the edge of the lacquer when the ' lads was carefully scru
tinised. The lacquer, when properly applied, did not ap-
pear to causeehalation, increased reflection, or interfere
with vision in any'respect;
Tho action of the lacquer appeared to be that of a
vater-repellent or ant.-wetting agent. This action Vas
very apparent when a small drop of water-'vae placed on a
flat surface of. i partially, lacquered glass pane. he
water on the unlioquzed p6rtion"disp'layed a odnsideiale
wetting or spreadingactio4 whereas the tater on 'the
lacquered part exhibit'edc:oonsiderably greatdr oohesite"ac-
tion. When the flat plate was tilted , the'vwaterranroff:
the lacquered part at an angle smaller than that at which
it ran off the unlaoquered pa.rt. When attempts were made
to run water from the unlacqered to the lacquered part of
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McAvoy, William H. & Clousing, Lawrence A. Observations of the improvement in vision brought about by the application of a rain-repellent lacquer on an airplane windshield, report, May 1942; (digital.library.unt.edu/ark:/67531/metadc62317/m1/2/: accessed March 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.