cnmark
ST1901-07
Seagull ST1901 - a column wheel chronograph watch movement.
Chronograph gear - ambient light (long exposure) and reduced flash make it look more speedy than it really is. The larger rotating wheel is the continuous seconds wheel - it's actual speed is 1 turn per minute (1 RPM).
Lower left is the balance - it swings back and forth at a frequency of 21,600 bph (beats per hour).
The slowly moving wheel center bottom is the minutes wheel - it's speed is 1 turn per hour.
© All Rights Reserved - you may not use this image in any form without my prior permission.
ST1901-07
Seagull ST1901 - a column wheel chronograph watch movement.
Chronograph gear - ambient light (long exposure) and reduced flash make it look more speedy than it really is. The larger rotating wheel is the continuous seconds wheel - it's actual speed is 1 turn per minute (1 RPM).
Lower left is the balance - it swings back and forth at a frequency of 21,600 bph (beats per hour).
The slowly moving wheel center bottom is the minutes wheel - it's speed is 1 turn per hour.
© All Rights Reserved - you may not use this image in any form without my prior permission.