| No. 36. | Horizontal Microscope. This instrument consists of a microscope tube
placed horizontally on a long extensible column, supported in turn by a
tripod base provided with levelling screws and a round spirit level. The
extension of the upright supporting column is accomplished by two
sliding motions, the lower, controlled by a set screw only, being
intended for coarser adjustments, the upper, controlled by rack and
pinion, for finer adjustments. A millimeter scale and a vernier serve to
indicate the degrees of the various motions, so that vertical motion of
the microscope tube to the extent of 1/10 mm may be accomplished.
The microscope tube carries a spirit level and revolves upon a
horizontal disc. The objective, consisting of two separable doublets,
permits three degrees of magnification of 5, 9 and 48 cm focal distance
respectively. A rack and pinion adjustment serves as adjustment of the
microscope tube. A micrometer, 1 cm long and divided into 100, in the
diaphragm of the ocular still further increases the availability of the
instrument for making fine and accurate measurements.
The instrument serves as a useful aid in many physical and physiological
investigations.
Price, including objective, ocular and micrometer | $40.— |
