| 摘要 |
The magnifying glass with two lenses has threaded bars (9) which turn by turning wheels (6), thereby adjusting the lenses (4) horizontally and vertically. The threaded bars and wheels are connected to as to drive splints (7) into holes (7). A second splint (38) is driven into the threaded bar to prevent it coming out of a hole. A pin (10) is turned into the wheels Two grooves(1) in the base frame (5) to guide the glasses.
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