From: The Popular
Science Review: A Quarterly Miscellany of
Entertaining and Instructive Articles on Scientific
Subjects, 1870.
Browning's
Pocket Microscope.- Mr. John Browning has recently
turned out a pocket microscope, which we have much
pleasure In commending to the notice of those of our
readers contemplating a sea-side tour. Its general
features are shown in the figure. It has two
objectives, 1-inch and 2-inch, and a large-field
eye-piece. The workmanship, like that of all Mr.
Browning's instruments, whether astronomical or
general optical, is excellent. This instrument, the
most portable yet contrived, is made with the body in
two parts, one sliding into the other; the outer
portion also slides down through the opening in the
stage, which carries the objects. Two legs are hinged
at about the center of the instrument; the rod or
tube, on which the reflecting mirror is fixed, forms
a third leg. Thus, when the two hinged legs are open,
the instrument has a firm tripod stand. These legs
being opened, the lower part of the body drawn
through the stage, and the eye-drawer withdrawn from
the body to about the same length is all that is
required to set up the instrument ready for use. The
tube spoken of as carrying the reflecting minor and
forming one of the legs has a fine screw on the
inside, and a milled head at the top. This screw
gives a fine adjustment. The instrument has eyepiece
with a large field, and good objectives. The height,
when set up for use, is about 1 foot, and the
dimensions of the case which contains the instrument
with two objectives, dipping tubes, and pliers
complete, is only 6 3/4 inches long, 3 inches wide,
and 13/4 inches long.