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microscope, with accessories in its original fitted mahogany case. The main focus and first stage draw tube is by rack & pinion and the draw tubes are calibrated for easy setting of tube length. The microscope has a mechanical stage with thumb-wheel "X - Y" control and a slide clamp with clips.The mechanical, centring, sub-stage has thumbwheel controlled rack & pinion adjustment and swings out for ease of changing the sub-stage accessories.So subsequently the Last Word posed a second question.Does any reader know why alternating blades makes each one last longer?
The plano-concave mirror is on a swinging limb for oblique illumination.
Although at first sight, this microscope could be mistaken for the Edinburgh H model, the layout of the stage controls suggest a different type.
The X-Y controls are set at an angle to the stage and are concentric, allowing a perfectly flush stage in front of the limb.
A golf ball has dimples on its surface to increase the efficiency of airflow over it and let it fly further.
Why isn't the skin of aircraft and cars similarly dimpled? Runners have long debated the difference between training on a treadmill and training on solid ground.