1、建筑物高度与钟面尺寸对应关系
| 楼高 | 10m | 20m | 25m | 30m | 35m | 40m | 50m | 60m |
| 钟面 | 1.0-1.5m | 1.8-2.2m | 2.2-3.0m | 2.6-3.2m | 3.2-3.8m | 3.6-4.2m | 4.8-5.5m |
5.8-6.5m |
2、模拟时钟钟面尺寸与可视距离对应关系
| 钟面 | 280mm | 300mm | 400mm | 500mm | 600mm | 800mm | 900mm | 1200mm |
| 视距 | 8m | 12m | 25m | 40m | 50m | 65m | 100m |
150m |
3、数字时钟数字高度与可视距离对应关系
| 字高 | 60mm | 100mm | 140mm | 190mm | 250mm |
| 视距 | 20m | 40m | 50m | 65m |
80m |
