This unique dual-purpose simple microscope integrates two designs: one side
functions as a high-power Globe/Craig-type microscope, while the other
incorporates a low-power system with a single magnifying lens, an integrated
stage, and slide clips. Both microscopes have focusing ability. The two
microscopes are attached to a stand having a central section that can pivot
and which houses a mirror. The mirror can swivel allowing it to be
used with either microscope. The instrument is constructed in lacquered
brass with the base being thin painted iron. In the horizontal position as
shown in the first photo, it measures 6 inches in height.
The optical system is 6½ inches in length, and the circular
base is about 3½ inches in diameter. The instrument was found with its cardboard
box, four small paper covered slides made specifically for this microscope,
and some blank slides.
In 1862, Henry W. Craig patented an affordable microscope, the "Craig Microscope".
Several retailers sold the device, which featured a drum-shaped housing
with an adjustable mirror located in the lower section and a slot at the top for slide insertion. Its optical system
used a thin glass plate fused with a glass bead, which resulted in an extremely short focal
distance. In fact, since the microscope lacked focusing mechanisms, specimens had to be in direct contact
with the lens to remain in focus.
In 1872, George Mead & Co. of Racine Wis, formerly a distributor of Craig Microscopes, introduced an upgraded version
called the "Globe Microscope." While visually similar to Craig’s design, it incorporated
improved optics consisting of a glass bead lens that allowed focusing by rotating the lens housing.
The microscope pictured on this page is a Globe-type, identifiable by its distinctive patterned
mirror knob, a hallmark of some known Globe Microscopes.
The second microscope integrated into this instrument is a classic design dating
back to the 18th century. It is a low-power, single-lens microscope featuring
a stage with clips to secure a slide. Focusing is achieved by adjusting the
lens holder via a screw mechanism.
Each microscope can be unscrewed from the middle portion resulting
in two separate hand-held microscopes, which are pointed towards a
light source when in use.
