The cable information blueprint from North Somerset Museum


North Somerset Museum 2003

This blueprint is pasted into Mr Mulholland's note book. There is no date but I estimate that it describes the cables as they were in about 1925 (before the remaining Canso-Waterville cables were diverted via St John's, Newfoundland in 1926).
The turquoise numbers in the transcription below are added by me to facilitate reading the two parts presented.
The cable designations refer to Cable Station identifiers used at the time as follows (according to my interpretation):

AZ Azores (Horta)
CS  Canso (Nova Scotia))
HA Havana (?)
HR Le Havre
MI Miami
NF   Newfoundland (St John's)
NY New York
PB Port aux Basques (Newfoundland)
RK Rockport (Boston)
SN Weston-super-Mare (Severn ?)
WV   Waterville

"CH" as in "CH-CH" has me baffled but possibly means "Cable Head".
"Length CH-CH" must be the main cable length in Nautical Miles.
"Total CR" is, I am sure, Core Resistance - note at mean sea temperature.
"I.C." is cable capacity, I think, in
F.
The next three columns are calculated from the previous ones: "R/K" is Resistance / Capacitance - not sure of significance; "KR" is Capacitance times Resistance and cable speed will be proportional to the reciprocal of this; I assume "KR Working" is the same value measured by a different technique.

 

CABLE
DESIGNATION

DATE LAID
AND SHIP

MAKERS
OF
CABLE

LENGTH
CH-CH
N.M.

CH-CH
TOTAL-CR
AT MEAN
S.T.

CH-CH
TOTAL
I.C.
MFDS.

CH-CH
R/K

KR
CH-CH

KR
WORKING
CCT

1 NF-WV MAIN 1 FARADAY 1884 SIEMENS

1802.12

5030

671.84

7.48

3.379

3.415

2 NF-WV MAIN 2 FARADAY

1884

SIEMENS

1833.96

5100

693.0

7.35

3.536

3.581

3 CS-WV MAIN 3 FARADAY

1894

SIEMENS

2166.86

4900

912.44

5.36

4.491

4.544

4 AZ-WV MAIN 4 FARADAY

1901

SIEMENS

1207.7

7647.5

431.4

17.72

3.299

3.316

5 CS-AZ MAIN 4 FARADAY

1900

SIEMENS

1698.68

6210.

653.49

9.5

4.058

4.163

6 CS-WV MAIN 5 COLONIA

1905

T.C.M.

2237.43

4087

931.

4.39

3.805

3.909

7 CS-AZ MAIN 6 COLONIA

1923

T.C.M.

1709.3

1700

768.1

2.21

1.305

1.328

8 AZ-WV MAIN 6 COLONIA-STEPH.

1923

do.

1222.47

1219.47

544.33

2.24

0.664

0.674

9 WV-HR MAIN 6 STEPHAN

1923

T.C.M.

512.2

525.96

226.55

2.32

0.119

0.127

10 AZ-HR MAIN 6 COLONIA

1923

T.C M.

1736.89

1747.73

771.84

2.26

1.349

1.369

11 NY-NF NY 1 do.

1909

do.

1302.01

5673

452.93

12.8

2.514

2.582

12 NY-NF NY 2 do

1912

do.

1265.16

4546

468.3

0.7

2.129

2.184

13 NY-CS NY 3 FARADAY

1884

SIEMENS

863.63

11530

256.8

45.04

2.932

3.081

14 NY-CS NY 4 SILVERTOWN

1900

SILVERTOWN

889.27

5786

314.39

18.41

1.819

1.869

15 NY-CS NY 5 FARADAY

1923

SIEMENS

974.15

2404

373.87

6.43

.898

.927

16 NY-HA HA  

1907

SILVERTOWN

1289.52

7925

441.06

7.97

3.493

3.545

17 MI-HA MI   1921 T.C.M.

262.6

2224

78.96

28.17

.175

 
18 RK-CS BICORE RK1
RK2
 

1884

SIEMENS

516.8

8351

163.7

51.01

1.367

1.421

19 PB-CS PB MB 1905 T.C.M.

199.86

1664.5

645

25.81

.107

.113

20 WV-HR OLD HR FARADAY 1885 SIEMENS

522.21

6880.

165.07

41.68

1.135

1.159

21 WV-SN BICORE SN1   1885 SIEMENS

331.9

3430.

105.5

32.51

.361

.363

22 WV-SN SN 2 SILVERTOWN

1901

SILVERTOWN

329.9

914

140.4

7.08

.139

.142

23 WV-SN SN 3   1910 T.C.M.

338

1712

114.0

14.95

.196

.198

24 WV-SN SN 4 J.W.M.

1923

do.

311.45

579

115.1

5.03

.066

.069

The table continues with these parameters.
"Undergrounds" I take to be the same parameters for the cables connecting the cable head to the station (it seems that a few went all the way into the station).
"Sea Earths" must represent similar data for the cables going out to sea earth plates / grids.
"Max depth" appears to have been a planned parameter for this table which was never filled in.
"Core" I am currently unsure about but it presumably relates to strand and / or cross sectional area of the core! (See below re diversions)
"Correct to" also is a little hard to understand but I think clearly refers to the last time the cable had attention from a cable ship.
"Original cable in circuit" is fascinating and it is only a shame there are not more rows completed. The second 1884 cable clearly had been nearly half replaced, whereas the 1900 Canso - Azores cable was still 100% as laid.
 

UNDERGROUNDS

SEA EARTHS

MAX.
DEPTH
FMS.

CORE

CORRECT TO

ORIGINAL CABLE
IN CIRCUIT

 

WEST

EAST

WEST

EAST

 

N.M.

CR.

CAP.

N.M.

CR.

CAP.

N.M.

CR.

CAP.

N.M.

CR.

CAP.

SHIP

DATE

N.M.

%

1

2.11

27.8

.63

NONE

   

3.17

7.8

1.2

.2

1.05

.08

     

J.W.M.

3-5-'25

   
2

2.095

27.8

.63

1.16

28

43

.05

.1

.02

749/749

19/19

43/43

 

430/270

350/300

M.L.M.

10-27-'24

1038.716

56.64

3

3.375

7.5

1.01

1.16

2.5

.4

.273

.7

.11

9.99

22.8

3.67

 

500/320

 

J.W.M.

3-6-'25

1877.68

86.53

4

1.44

5.6

.48

NONE

   

.85

4.7

.3

1.06

4.2

.4

 

170/160

   

OCT. '24

1201.36

99.72

5

3.25

55.7

1.35

1.44

5.6

.48

1.29

4.7

.53

1.43

5.7

.54

 

300/240

 

AS LAID

OCT. '24

 

100

6

3.3

35.5

1.35

NONE

   

2.0

3.8

.83

9.067

17.8

3.76

 

600/340

   

SEPT. '22

2197.317

98.2

7

3.25

3.6

1.47

.74

.9

.33

13.2/8.7

13.11/88

5.6/*3.8

1.43/1.43

1.52/1.52

.65/*.65

 

1100/450

 

J.W.M.

FEB. '25

   
8

.74

.9

.33

1.1

1.04

.47

8.45/2.7

9.11/2.9

3.69/*1.18

10.3/5.

10.58/5.11

44.8/*2.16

 

1100/450

         
9

1.11

1.15

.48

1.25

7.2

.37

6.0

6.2

2.61

8.7/2.7

9.3/2.9

3.8/*7.76

 

do.

         
10

.74

.9

.33

1.25

7.2

.37

8.45/2.7

8.11/2.9

3.69/*7.78

8.7/2.7

8.3/2.9

3.8/*7.76

 

do.

         
11

.36

3.2

.14

2.11

27.8

.63

9.34

32

3.51

3.23

13.9

7.126

 

250/200

 

J.W.M.

NOV. '24

   
12

.36

3.2

.14

2.11

27.8

.63

6.025

19.8

2.115

3.04

8.5

1.1

 

450/270

250/200

do.

FEB '25

   
13

.36

3.2

.14

3.5

17.3

1.05

4.9

42.3

1.596

EASTWD. UG-SE 57.6ω

 

70/85

 

S.FIELD

MAR '25

   
14

.36

3.2

.14

3.36

9.5

1.01

8.96

58.8

3.1

1.5

10.04

.525

 

110/160

 

M.L.M.

MAR '24

   
15

.36

3.2

.14

3.23

8.08

1.24-

7./7.

17.9/17.9

2.61/2.61

2.95/2.95

7.6/7.6

1.14/1.14

 

450/270

 

do.

MAY '24

   
16

.36

3.2

.14

.207

1.93

.07

9.81

65

3.35

.75

5.1

.26

 

180/160

 

ALLA

JAN '23

   
17            

3.16

29.4

.987

96

9

304

 

130/130

         
18

1.845

26.8

.64

3.5

17.2

1.05

5.28

88

1.69

EASTWD. UG-SE 59ω

 

70/75

 

J.W.M.

MAY '23

   
19            

TOT. DEDUCTION 95.5ω

       

130/130

 

TYRIAN

JAN '16

   
20

.22

3.5

.07

1.25

7.2

.57

.12

2.1

.02

5.08

4.6

1.59

 

20/75

 

G.G.W.

JUNE '23

   
21            

.22

3.7

.07

.4

4.75

.12

 

90/85

 

do.

JULY '23    
22            

.83

2.6

.09

4.9

15.2

.21

 

375/225

 

do.

FEB '24

   
23            

.8

3.5

.14

3.

15.5

.518

 

220/180

 

do.

DEC '22.

   
24            

.3

I.0

.05

10.05

19 7

1.87

 

600/340

         
Cable 10
The cable on row 10 (AZ-HR) is interesting as the maps do not show such a cable and consideration of the lengths and resistances leads to the conclusion that this is actually the AZ-WV and WV-HR cables connected at Waterville Cable Station. Note also that the western undergrounds for AZ-WV and AZ-HR are identical as are the eastern undergrounds for WV-HR and AZ-HR. It may also be of significance that this "cable" is almost identical in KR value to the CS-AZ section of the same "MAIN 6" group so they could both be expected to deliver the same speed, repeated at Horta, with a straight through connection at Waterville.
On the other hand - the entries for cable-laying ships don't quite agree with this and information from the History of the Atlantic Cable & Submarine Telegraphy website credits the Colonia with laying Horta to Havre in 1923 and the Stephan UK-Ireland that year (J.W.M - the cable ship J W Mackay in the blueprint above).
Diversions
Cables 1 and 2 had been diverted by this time from their original CS-WV route to land at NF and the remaining part extended to NY[B]. This is no doubt the explanation for the dual CORE entries for cables 2 and 12 - each having a new and old section. The information for cables 1 and 11 which should have the same relationship appears to be incomplete. It is interesting to speculate that there appears to be a slip in the figures for 2 and 12 as presumably both should show 450/270 or 430/270 (for the original cable). 250/200 would appear to be the gauge (or whatever) for the new cable on the NY run and 350/300 for new cable into NF.
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