ORIGINAL (1843) | MODIFIED (1844-1848) | FINAL CONFIGURATION STARTED IN 1848; USED ON ALL P & L MICROSCOPES BY 1850 | |
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ADVANTAGES | Fine Adjustment knob in same plane as coarse adjustment | Fine adjustment knob in same plane as coarse adjustment knob. Unlikely to bind.Greater range of fine focus than the wedge arrangement. |
Simple Design, less labor intensive to make |
DISADVANTAGES | Prone to binding of the wedge mechanism | More labor intensive to make Pivot supports of the l-shaped piece carry all the weight of the nosepiece and its spring which would increase with added double nosepiece and accessories |
Difficult to find the fine focus knob without taking ones eye off the eyepiece |