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Stopwatch: Lugrin, 1876
Henri Alfred Lugrin of New York patented this timing watch in 1876, US 176,231. Instead of placing the timing hand on the face, where it needs more gearing, he put the timing hand and its own dial on top of the watch movement. The hand is geared to the watch's second wheel through a pinion and wheel, and sits on its post by a tube and friction spring, so it can be stopped while the watch runs on. A heart-shaped cam and lever return it to the start, and the same lever also returns a minute hand on a small sectional dial beside it. A stop lever holds the timing hand. Lugrin's hand moves in fifths of a second but he calls it the quarter-second hand.
高级
Watchmaker's work
说明
1
1
Timing hand and dial
Timing hand and dial
Mount the timing hand and its dial on top of the watch movement, the hand on a short centre post.
此步骤所需材料：
手表机芯1 个
计时针与表盘1 个所需工具：
精密镊子套装
螺丝刀套装2
2
Gear it to the movement
Gear it to the movement
Gear the post to the second wheel of the watch train through a pinion and wheel.
此步骤所需材料：
计时轮系小齿轮与齿轮1 个所需工具：
精密镊子套装螺丝刀套装3
3
Friction connection
Friction connection
Connect the hand to its post by a tube and friction spring, so the hand can be stopped without stopping the movement.
此步骤所需材料：
摩擦弹簧与套管1 个所需工具：
精密镊子套装4
4
Minute recorder
Minute recorder
Place the minute hand and its sectional dial at one side of the timing hand, on a post geared with the barrel wheel, connected by the same kind of tube and friction spring.
此步骤所需材料：
分钟累计针与表盘1 个所需工具：
精密镊子套装螺丝刀套装5
5
Return and stop
Return and stop
Fit the heart-shaped cams and the return lever, extended so one lever returns both hands to the start at once, and fit the stop lever.
此步骤所需材料：
心形凸轮与归零杆1 个
停止杆1 个所需工具：
精密镊子套装螺丝刀套装材料
7- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
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