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Hand Lens 10×: a Small, Steep Lens Ground and Mounted
A 10× hand lens is a small convex lens of about 25 mm focal length: held close to the eye, its magnifying power is about a quarter of a metre divided by the focal length. Grind a small pair of discs to a steep curve as for any convex lens, then seat the convex one in a turned wooden ring with a cord to carry it.
The picture: a low-power reading magnifier on a dictionary page; a 10× hand lens works the same way with a much smaller, steeper lens.
高级
A week
说明
1
1
Two small discs
Two small discs
Cut two small glass discs, about 15 mm across, from glass at least 5 mm thick (each face of the lens goes over a millimetre deep), and pitch each to a short wooden handle.
此步骤所需材料：
玻璃板1 个
松脂胶10 克
硬木条1 个所需工具：
玻璃刀
玻璃钳
安全眼镜2
2
Grind to a steep curve
Grind to a steep curve
Grind them together with wet coarse grit, the same disc always on top, until the faces are steep enough (see the notebook). Then the second faces. The bottom disc is the lens.
此步骤所需材料：
碳化硅磨料40 克
水1 升所需工具：
6 英寸数显卡尺3
3
Fine grind and polish
Fine grind and polish
Fine grits, then polish both faces on a small pitch lap with tin oxide and water until clear.
此步骤所需材料：
碳化硅磨料20 克
氧化锡（二氧化锡）10 克松脂胶30 克4
4
Check 10×
Check 10×
Focus the sun through it onto paper: the spot should be smallest about 25 mm from the lens. Grind deeper if it is longer.
所需工具：
直尺5
5
Turn the mount
Turn the mount
Turn a hardwood ring on the lathe with a seat a snug fit for the lens and a small lip. Press the lens in, warm a little pitch round the back edge to hold it, drill a hole in the rim for a cord loop.
此步骤所需材料：
硬木条1 个松脂胶2 克
上蜡亚麻线0.5 m所需工具：
木工车床
圆凿
车床切断刀
砂纸6 英寸数显卡尺6
6
Curve for 10×
Curve for 10×
正在加载 Jupyter 笔记本…
7
7
Use
Use
Hold the lens close to your eye and bring the object up until it is sharp.
材料
7- 1 个占位符
- 42 克占位符
- 1 个占位符
- 40 克占位符
- 1 升占位符
- 10 克占位符
- 0.5 m占位符
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