Burlington weekly free press. [volume] (Burlington, Vt.) 1866-1928, 1884-03-14
MICROSCOPES.
fOmethine OF fnterst and Value about
them and their Uhe.

'This is ry Ie instrument, but this
may suit you better" Saying this, the
optican placed two highly polished mi
eroscopes on the glass case for the admra-
ton OF an expectant purchaser. One was
monocular, the other binoeular. "The
highest of binoculars are very near per-
fection, and, OF course, are high priced,
while for n small amount You can get q
very good monocular. Never looked
through one? Then don't, for my sake,
attempt to select one off hand. If yeu
don't know much about microscopes | adj
wise you to read this little book. After
deciding upon the amusement you wish
to have or the work you desire to perform.
you can, after reading this, fix your limit
for an instrument" The yong man, after
looking through both instruments with
out seing anything, took the pamphlet,
promising to call again.
he IL come back, the optican remark
ed with a satisfied air. IF he has the
microscopic fever on it will be some time
before he throws it off. The interest IN
the use of the microscope both for amuse-
ment and scientific or practical purposes
increases every year 1t was only the
other day that the meeting Of the Textile
Microscopic Association was held in this
city. 1t has more than 100 members, and
Its object is to increase and encourage the
practical application of microscopic work
in all branches of the textile industry to
disseminate reliable information pertain
ing to the requisite Instruments and the
proper mapipulatiOns of the same to seek
and devise means for reducing the cost
and increasing the accuracy of microscopic
examinations of textile subjects, and tC
regulate tests by establishing standards
In France, Germany and England the
microscope Is in constant use in the ex
animation of textile goods and the usei
to which it may. be put in the textile in
dustry are almost unlimited. By it
merchant is able to detect the two breeds rel
resented in sheep that are cross betweel
merino and a South Down by fibre o
the wool from the animal He can tel
when fibre has been subjected to mechani
cal or chemical injuries, and can detec
adulterations in goods.
"a very common mistake with person
who attempt to select microscopes is Il
Judge Of the excellence of one by the a
mount OF its magnifying power. No OBJ
iect should be viewed with power great
er than is sufficient to clearly show it
structure, and if that can be done with q
diameters, it is folly to apply 100. Thi
is especially, the case with low-price
instruments where the actual and angula
apertures Of the objectives are small an
the corrections not so exact as in those @
a higher grade, renderering them NOR
liable to give false impressions of the OF
iect And it is impossible to view a
opaque object by reflected light, sati,
factorily, with auy of the cheapest form
OF compound microscopes. The lesse
approach the object too nearly, and al
lar too small to admit OF proper illuminf
ton OF the object. For those who wis
TO disssct flowers, insects, etc, for exam
nation, simple microscope is bette
The essential points to be observed
selechng microtcope are that the lense