細節
An 18th-Century brass 4-inch reflecting telescope,
signed on the 25in. (63.5cm.) long body-tube Nairne London, with dust cap, twin fixed sights and screw-rod focusing, two good speculum mirrors, single eyepiece with draw-tube, mounted on a compass joint over the tapering pillar support and folding tripod stand, the cabriole legs terminating in pad feet
See Illustration Back Cover
signed on the 25in. (63.5cm.) long body-tube Nairne London, with dust cap, twin fixed sights and screw-rod focusing, two good speculum mirrors, single eyepiece with draw-tube, mounted on a compass joint over the tapering pillar support and folding tripod stand, the cabriole legs terminating in pad feet
See Illustration Back Cover