The Distance to Distance relationship between the Earth’s Equatorial Circumferential Distance and the Distance Piece Dial Circumferential Distance. i.e. between the EECD and DPDCD. See Figure 20 on Page 37.
Looking at fig. 20 we notice that the Earth’s Equatorial Circumferential Distance (EECD) of 40075km = 86400 Chkm is divided into 24 equal divisions i.e. each Division “DV” being equal to 3600Chkm. or B= 3600 Chkm. These Divisions have been numbered as 0, 1, 2,3,4,………..11,12,13,………..22,23,24= 0 (starting of a new revolution) and then again 1, 2, 3,4,…… and so on . As the Earth rotates on its axis, it moves through all these 24 Divisions. These Distances Travelled by the Equator are matched to the movement of the Needles B, R & P (Needle P’s movement has been ignored as the Divisions are too fine for this Fig.7 of Page 14 and Fig. 9 of page 16 may be referred to see the fine divisions of Needle P). We notice at the starting of a new Revolution of the Equatorial Distance i.e. B=0 both the needles B & R are in the perfectly vertical position, which means 24 Basics of the previous Revolutions and 0 Basics of the New Revolution coincide. At 1B; B=1 and Needle R after having made a full Revolution of the Dial face (DF) is once again back at the previous vertical position i.e. one full Dial face (DFR-60) movement of Needle R on the Distance Piece gives 1 Basic; 0 to 1 on the Earth’s Equator. Also Needle B moves 1/12th of the Dial Face (DFB-1/12) as shown in Dial 1B. Similarly as the Earth’s Equator turns further to 2 Basics, Needle R makes one more full Dial (DFR-60) revolution and comes once again to the original vertical Position on the Distance Piece Dial (DF) which gives another 3600 Chkm on the Earth’s Equator. Also Needle B moves 2/12 of the Dial (DFB-2/12) distance as shown in Dial (DFB-2/12).
Similarly, if we go to 9 Basics on the Equator, then Needle R would be making its 9th complete Dial (DF R-60) Revolution indicating 9 basics on the Earth’s Equator. Also Needle B would move to a position which is (DFE-9/12) of the Dial (DF), as shown in Dial (9B). (For symbols refer page 17)
Note: 9 One’s attention is drawn to the 24 divisions (DV) of the Earth’s Equator and that the Distance Piece has a Dial of only 12 Basics. As such, after we have reached 12 Basics on the Distance Piece, we imagine that 1 Basic of the new Dial Revolution (for Needle R) is, 12 + 1 = 13 Basics; 12 + 2 = 14 Basics; 12 + 3 = 15 Basics and so on up to 24 Basics.
Now when the Equator revolves further, the Distance between 10 Basics & 11 Basics is divided into half and then half again giving a ¼ DFR (60R¸4=15R). Here Needle R moves 10 complete Revolutions and then moves further another 15 Ranges. Needle B crosses 10 Basics and moves forward another ¼ of the Distance between 10 Basics &11 Basics, as shown on Dial 10B.15 R.
As the Earth’s Equator revolves further and reaches say 15 Basics, Needle R has completed 15 Revolutions and reaches the original vertical position. Needle B takes up position 3 Basics; as on Dial (DF) 3B (as 3 is 3 more than 12 i.e. [12+3=15]) as shown on Dial (DF) 15B. The Equator revolves further till (WE BY RIDING ON IT REACH) 16 Basics; here again the Distance of B = 3600Chkm between 16 Basics & 17 Basics and the equator is divided into 4 parts i.e 900 Chkm or = 15R (as 1R=60 Chkm & 900/60=15 Chkm) and the Needle R on the DISTANCE PIECES (LYING ON SHELVES HANGING ON WALLS, STRAPPED ON TO OUR WRISTS) would have made 16 complete Revolutions and moved forward 15x2=30 Ranges, whereas Needle B would travel ½ the Basic between 16 and 17 (i.e. 4 & 5 on the distance piece) on the Equator i.e. 3600/2