Astronomical Clock as described in Britten's handbook

 

  After Ferguson's design (1710-1776)

 

 

A clock showing the comparative motion of the heavenly bodies

 

 

Sun ball = local time
 First ball = winter time
Second ball = summer time
24 hour plate = divided in 29.5 Moon days

The Zodiac is the real Astronomical one, with different length of the signs

 

 

The pendulum rod is from Invar
 

 Calculation sheet 1
 Calculation sheet 2
 

Halfway

 

 

Driving clock (with winding at the side)

For this clock I also used the book " How to make a weight driven 8 day wall clock by John Wilding"

 

Winding view from above
It has
strong Bevel gears, the pin in the front makes it possible to disengage

 

Epicyclic Wheelwork

 

Later I had to change the Bevel Gears, the turning direction of the Moon ball was wrong

 

At both ends of the shafts are miniature Ball Bearings
 
(Rex Swensen did a good research about the use of Ball Bearings in Clocks,
if washed out with a solvent the friction will be about 1/70 of a plain pivot)

 

The 24 hours disc with Sun

 

Some parts of the driving clock
 
The Barrel has at front and back side ball bearings to support the heavy Weight

 

 

Barrel (with maintaining power)

 

 Wheels and lantern pinions, the escape wheel is hand made

 

 

Rough lantern pinions - pin size 0.6mm
(Dressmaker pins, pressed in)

 

Winding Key

 

Click spring - click pivot - back cock - crutch

 

Back cock

 

Homemade depthing tool

 

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