Constructing a Distance Piece (Continued)

Having a Dial with 12 main divisions and each main division is further divided into 5 sub-divisions and each sub-division=1mm (Standard mm as a Chotu mm will make too small a Dial) Such that the Dial Circumference would be (on which the longest Needle P’s tip would move) = 12x5=60mm and the Diameter of the Dial would be =60¸p=19.0985 » 19.1mm i.e. C=60mm (Circum.) & D=19.1f mm (Dial.) Three Dials for Needle movements.

P, R & B have been shown on the Right while on the Left we have the Diagram of the Earth with the Equator divided into 24 divisions which are in Chotu Km i.e. each Division (DV) is a Basic (B) = 3600 Chkm which is represented by  1/12 Dial = 60mm/12 =5mm on the DFB , One complete Dial = 60 mm on DFR and  = 60 Dials x 60mm = 3600mm on the DFP. ( For symbols refer page 17 ) DISTANCES MOVED ON THE EQUATOR REPRESENTED BY                       12

 = 1mm

NEEDLE MOVEMENTS ON THE DISTANCE PIECE DIAL

Earth’s Equatorial

Circumference Distance EECD Earth’s Equator Movement    ¬ Represents ®

P = R/60 = 60/60 =1 Chkm

R =  60 P =  60 Chkm

R = B/60 = 3600/60 = 60 Chkm

B = 60 x 60P = 3600Chkm

B = E/12 = 60 X 60P = 3600Chkm

E = L/2 = 86400/2= 43200 Chkm

L = 86400 Chkm

Distance Piece Dial

Circumferential Distance  DPDCD.

Needle   Movements

 DfP

Needle P’s

1/60  Dial  =1/60 x  60 mm = 1mm

 12

1 Dial = 1x 60mm     = 60mm

Needle R’s

1/60 Dial = 1/60 x 60mm  =  1mm

 =1mm

1 Dial = 1 x 60 mm    =  60mm

Needle  B’s

1/12 Dial = 60mm/12         =  5 mm.

1 Dial = 1x 60 mm       =  60mm

 DfR

2 Dial = 2x 60mm = 120 mm.

 =5mm

 DfB

 Fig. 7

(14)

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