Solar Microscope, English, Early 19th Century

The cylindrical body has a draw tube and a conical extension with an aperture that screws into the end. The body screws into the shutter plate which has a hole at each corner. The rectangular mirror is attached to a hinge on the rear of the plate. A grub screw turned by a mill-edged knob in a semi-circular slot in the front of the plate alters the angle of the mirror. This assembly is mounted on a copper alloy disk set in the plate which can be turned, independent of the body by a second knob on the plate.