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A Royal Haagse Klok by Severijn Oosterwijck. Author: Keith Piggott.

A Royal 'HAAGSE KLOK'
by: Keith Piggott.

Keith Piggott.


APPENDIX 1                              Back to Main Document.

 

Dimensions and Construction


  The classic ebony veneered
box case.  
    Measurements in mms. including veneers
  ř denotes original part.
  ® denotes replacement part.
Box:
 
  Internal H.254  W.210  D.76
External H.207  W.162  D’.70
Overall D 92,5 (incl. door)
Door   Frame: H.257.5  W.212  D.16.5
Reveal: H.207  W.162
Stiles: W. 25  Th. 16.5
Ends & Sides   25 thick
Backboard   6 thick  (Solid Show-wood)
Carcass

 
  Solid Show wood: Kingwood, Dalgeria Cearencis (provisional)
Poss. alternate: Cocobolo -Dalbergia Retusa.
Veneers   Ebony (Genus not identified.)
Sound Holes   Diams: 35 (side),  41 (underside)
Susspension(missing)   2 piece Capstan & Ring, or Single Eyelets?
Crest?   Pegged through the top for later Crest or Pediment?

 
  Dial.
    measurements in mms.
Dialplate
4 round feet
  212 x 165 Brass ř. Av. 2.2 thick, clad in uncut velvet
Chapter Ring   Diam. 143 x 103, Th. 1.18 
Anulus   20  1.18 thick, 4 studs.
Hour hand   51 Gilt Brass ř.
Minute hand   70.5 Gilt Brass . Tip has a steel pointer
  Dial Apertures
Pendulum access   18 x 40 , covered by the signature cartouche
Sector cut out   20.5 x 12
  Folding Pendulum Holdfast
Holdfast spring   L.31.5 W.15 >0.6 Th. 0.13
Holdfast folding lever   Brass L. 56  W. 13.5

 
  Movement.
    measurements in mms.
  Movement plates
Backplate   (pinned) 115 x 94  Thickness 2.33 >2.15
Frontplate   115 x 94 Thickness 2.22
Pillars   4 Octagonal, L. 38, Th. 8.05>7.85
  Split-Barrel:
Splitt Barrel
Rear going
Front strike
  Diameter 43, Length 25.
D. 49.4  t. 72
D. 49.95  t. 80
Arbor   Length 55.56  Square 3.6
Ratchet
boss+cam
  D.34.4, 21 teeth, thickness 1.85
D,11, Thickness 4.85
Stop
Concealed
  D.10.3 8/6 cut spring Thickness 1.25
     

 
  Going Train.
    measurements in mms.
Train  
72

 First wheel

6

70

 Centre wheel

  5 60  Contrate wheel
   5

27

 Escape wheel
Pendulum   Beats 151,2 p/m
Nominal length 15,8  (6.1”)
First wheel   Sited at Backplate. Diam. 49,4
Centre Arbor   Length 59.4, Diam. 3.95 Tapered, Relief 2.15 .
Centre-wheel   Diam.39,4 Pinion diam. 4,82, pinion 4.7 long
Contrate-wheel   Diam. 37,3 pinion diam. 3,5
Collet replaced.
Escape wheel   ® diam, 28,7 Pinion diam. 3,7
Remarks

 

  Oosterwijck’s original train, except escape wheel teeth being re-cut”. Extant Pendulum: 16.45 cm ( 6.5”) Centre of Bob to Cheeks (151.2 beats/minute)
  Motion work.
Train  
32

 Minute wheel

32 6

 Reverse minute wheel

   72

 Hour wheel

Minute-wheel   Single pin (Hour strike) 
diam. 41.5
Reverse-Minute   33.0 diameter.
Hour-wheel   radial marking, 43.2 diameter.
Cannon   Now punch-dimpled, transverse pin secures hour hand.

 

  Strike Train.
Train  
    80

 First wheel

  10

8

60

 Pin wheel

Drive whl.  78   6 48

 Warning wheel

  6 48

 Interm. whl.

   5

 Fly

First-wheel   Diam. 49.4 Sited at Frontplate
Pin-wheel   Diam. 40.6, 10 steel pins Pinion diam. 5.25
Warning-wheel   Diam. 32.5 . Pinion diam. 4.9. 2 brass pins, dome-collet. Warning-pin resited by 18 on same radius (accident)
Intermediate-wheel   Diam. 28.8 . Pinion diam. 4.7
Fly   Pinion diam. 3.6  2 vanes.
Lozenge section 22 x 25  long.
Strike Lever   R? Restorer inscription infers lever “added, adjusted, repaired”
Strike Gates   Steel scrolls, 2 below, 1 longer above
Count-wheel   (locking plate) ř 12 unequal detent slots, I to XII, 78 strikes p/hr.
Diameter 72
Drive-wheel   78 teeth, Diam. 50  Pinion 10 on Pinwheel arbor.
Hammer   Brass head with steel striker, dove tailled to a steel stem,its pivot scroll is tensioned by thick brass “L” stop spring.
Bell   On Dial. Diam. 70.8  Height 29  2.7 thick.
Bellstand   Base 12.55 x 9.98 tapering to 6.4 x 6.2  2 Rivets. Height 31 + 5.5  Five turn screw, Diam.3.5
 

Copyright: R.K.Piggott, February 20, 2009.

   

 

 

 

 

 

 

 

 

 

 

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