F. they are certainly
more trustworthy than anything save an air thermometer of suitable
construction; and for all temperatures from 800 deg. to 900 deg. F. up nearly
to the melting point of platinum they are without a rival, so far as I
know.
For some situations the ball can best be inserted in the fire or other
situation where an observation is desired, and withdrawn for immersion
by means of long, slender tongs, with jaws resembling bullet moulds.
A word about the melting point of platinum. My balls certainly began to
melt below 2,950 deg. F., but I am by no means sure that they do not contain
any silver, although their specific gravity gives assurance that they
are at least nearly pure.--_Franklin Journal_.
* * * * *
LOCOMOTIVE PAINTING.
[Footnote: A paper read before the Master Car Painters' Association,
Chicago, September, 1883.]
By JOHN S. ATWATER.
The subject of locomotive painting has been pretty well discussed at the
former meetings of the association, and we have heard many excellent
suggestions regarding the use of oils, mineral paints, and leads from
gentlemen of long experience. But as the secretary has invited a display
of my ignorance I will endeavor to explain as clearly as possible
the methods I pursue, which, though not new or original, have been
productive of good results.
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