## 2. What option 34 shows

**The drawing builds in a drafter's order:**
1. Border, then dash-dot centre lines.
2. The body circle swept by a compass (you see the compass arm follow the pen).
3. Construction lines through the eye centres, and a 35° angle marking the eyes' slant.
4. Eye outlines.
5. Projection lines carrying edges across to the other views.
6. Top view above and right-side view beside, laid out in third-angle projection.
7. Dimensions: body Ø120 mm, eye length 32, eye positions 32.4 and 26.4 from centre.
8. Cutting plane A–A, then the section or exploded view.
9. Title block with parts list.

**Two ways to show the inside (invented internals):**
- **Section A–A:** the 4 mm shell, a core frame, a battery cell and an eye insert, hatched in different directions so each part reads as separate.
- **Exploded:** five parts spread along an axis with numbered balloons that match the parts list.

**Then it comes alive.** A ground line appears. The front view hops and squashes, and live dimensions report height (H) and width (W). The width grows to about 132 mm on landing, because squash keeps area.

**Four drafting styles:**

| Style | Look | Heritage |
|---|---|---|
| Blueprint | White on Prussian blue | Cyanotype copies, 1870s–1950s |
| Pencil drafting | Graphite on vellum | Drawing board and T-square |
| CAD screen | Colour-coded layers on black | Computer-aided design: centre lines red, dimensions green, hidden yellow |
| Patent drawing | Black ink, FIG. labels, reference numerals, solid eyes | Patent office rules: no dimensions, numbers instead |

## 3. Less obvious details

- **Dash-dot means centre line; dashes mean hidden.** In the side view, the eye facing away is dashed. In the front view, the hidden core outline is dashed. The line style carries meaning, not the colour.
- **Hatching directions are a code.** Different parts in a section are hatched at different angles so an engineer can tell them apart without colour.
- **Patent drawings ban dimensions.** They label parts with reference numerals (10 body, 12 and 14 eyes). The written description does the measuring.
- **The eye construction uses real geometry.** The same numbers used since option 1 (35° slant, centre offsets) become the dimensions. The design has been "specified" all along.

## Examples

**Third-angle layout**
```
┌─────────┐  ┌───────────┐
│   TOP   │  │ SECTION / │
│    ○    │  │ EXPLODED  │
└────┬────┘  └───────────┘
     │ projection lines
┌────┴────┐  ┌───────────┐
│  FRONT  │──│ RIGHT SIDE│
│   ◉◉    │  │     ○)    │
└─────────┘  └───────────┘
[ PARTS LIST | TITLE BLOCK ]
```

**Line language**
```
──────────  visible edge (thick)
- - - - -   hidden edge
─ · ─ · ─   centre line
━ ━ · ━ ━   cutting plane (with arrows A)
╱╱╱╱╱       section hatching (angle = part)
|←  Ø120 →| dimension
```

**Live dimensions in alive mode**
```
          W 132 (squash)
       |←──────────→|
          ( ◉ ◉ )
          ────────     H 0
hop apex:   ( ◉ ◉ )  ↕ H 30
       ▔▔▔▔▔▔▔▔▔▔▔▔ ground
```