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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.
Advanced
Watchmaker's work
Instructions
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.
Materials for this step:
Watch Movement1 piece
Timing Hand and Dial1 pieceTools needed:
Precision Tweezers Set
Screwdriver Set2
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.
Materials for this step:
Timing Train Pinion and Wheel1 pieceTools needed:
Precision Tweezers SetScrewdriver Set3
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.
Materials for this step:
Friction Spring and Tube1 pieceTools needed:
Precision Tweezers Set4
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.
Materials for this step:
Minute Recorder Hand and Dial1 pieceTools needed:
Precision Tweezers SetScrewdriver Set5
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.
Materials for this step:
Heart Cam and Return Lever1 piece
Stop Lever1 pieceTools needed:
Precision Tweezers SetScrewdriver SetMaterials
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