アート

美容とウェルネス

工芸

文化と歴史

エンターテインメント

環境

食品と飲料

リバースエンジニアリング

科学

スポーツ

テクノロジー

ウェアラブル

Hand Lens 10×: a Small, Steep Lens Ground and Mounted

Karbyn (Wikimedia Commons) · CC BY-SA 4.0

作成者

Penny

14. 10月 2026

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.

上級者

A week

手順

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.

このステップの材料:

ガラス板1 個

松やに接着剤10 g

堅木の細板1 個

必要な工具:

ガラスカッター

ガラス用やっとこ

保護めがね

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.

このステップの材料:

水1 リットル

必要な工具:

デジタルノギス 6インチ

炭化ケイ素砥粒

Fine grind and polish

Fine grits, then polish both faces on a small pitch lap with tin oxide and water until clear.

このステップの材料:

酸化スズ（二酸化スズ）10 g

松やに接着剤30 g

必要な工具:

炭化ケイ素砥粒

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.

必要な工具:

定規

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.

このステップの材料:

堅木の細板1 個

松やに接着剤2 g