Horse bit and optical telegraph: what they have in common

1. Step 1. Horse bit — is part of — Bit and bridle. Metal in the horse’s mouth.
2. Step 2. Bit and bridle — is made of — Bone. Early cheekpieces were carved from antler and bone.
3. Step 3. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
4. Step 4. Spectacle frame — is part of — Glasses. A frame.
5. Step 5. Glasses — evolved into — Telescope. The first telescopes were assembled by spectacle makers.
6. Step 6. Telescope — is used in — Optical telegraph. Signals were read through a telescope.

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