Contract numbers

Milliken Brothers and Blaw Knox
J L Eve
Watsham’s
Callender’s
BICC

For line contracts, see the schemes page.

Milliken Brothers and Blaw Knox

Erection diagram numbers are placed into a range with the same number as the contract, e.g. the K5735 erection diagrams are all numbered in the K5735 range. General arrangement diagrams are placed into a separate drawing number range with an XM prefix. Combined general arrangement and erection diagrams also use the XM range. The exact reason for the two number ranges is not known. Items marked † may be incorrect due to source material condition.

Contract number	Year(s)	Coverage	XM series	Notes
L134	1927	Milliken L134	?
L145	1928	CS PL1	L145	L145 used for all known drawing types
T161	1929	CE PL1	?
E112	1929–33	NWE PL1	LT530
E136	1929–31	NEE PL1	LT2880†
E142	1929–31	EE PL1	LT231†
E111	1930–32	NWE PL2	LT630
E141	1931–32	SWE PL1	LT3630
E164	1932	SS PL1	?
E177	1932–3	Milliken E177	XM911
K1373	1935–38	Blaw Knox K1373	XM1180
K1535	1935–37	NWE SL4	XM1266
K1576	1936	Blaw Knox K1576	XM1284	Spey Valley Extension (Tummel Bridge–Keith)
K1611	1936–37	CE PL3	XM1276	Drawings for only two tower types (D30 and DD30) recovered
K1857	1936–37	CE PL4	XM1317
K4611	1939	Blaw Knox K4611	XM1631	Continuation of K1373
K5297	1940	WGR single circuit	XM1692	XM range almost certain, but unproven; used by SWE PL9
K5735	1940–41	Blaw Knox K5735	XM1742	Only DD2 to DD90 recovered
K5784	1940, 1967	War Time Grid	XM1746	Only DDT90 (1940) and DDT90 auxiliary crossarms (1967) drawings recovered
K6235	?	“PL4”	XM1772	Gloucester–Ebbw Vale
			?	XM1775	Carlisle–Distington
			?	XM1783	Ocker Hill–Nechells
			?	XM1809	“Bedford - Little Bedford” (Little Barford?)
			?	XM1827	Upper Boat substation
			?	XM1821	Padiham
			?	XM1848	Swindon (SEE PL17)
K7049		NWE PL10		Natland to Barrow-in-Furness on PL4 towers
K8323	1944–45	SWE PL16	XM1908	[Telecoms Work on Overhead Lines] inexplicably has XM1904-14 (BK47/9101) for type “D22”
K9534	1946	PL16 D60 Junction, possibly more	XM1991
K9857	1945–47	“Scottish”	XM1955	As K8323 (SWE PL16) but with replacement line towers; designed to specification STL1
K9906	1947	Blaw Knox K9906	XM2049
K9989	?	L34	XM2015?
K1201	1947–50	Blaw Knox K1201	XM2051	“Scottish” single circuit
K1420	1947–1950s	Blaw Knox K1420	XM2054
K1641	1948–49	Northern Ireland 110 kV SC	XM2095
K1124/K1124B	1940s, 50s, 60s	PL16	XM2092	Seems to be a continuation of K8323/K9857; full date range unknown
K5128	1950–52	L66	XM2368
T1011	1951–62, 1971	L2	XM2534
T1073	1953	Rotated base gantries	XM2683	Categorised under PL16 for now
T1120	1953–59, 1968	Blaw Knox L3	XM2758
T1498	1959–60	Inveraray–Taynuilt	XM3506
T1521	1960	Blaw Knox T1521	XM3390	Only the D key erection diagram/drawing schedule recovered
T1648	1961	Blaw Knox T1648	XM3693	Only the D GA&ED recovered
T2175	1967–68	Blaw Knox T2175	XM4451
T866	?	L8	XM866
T472	1973–75, 1987	L4(m)	XM472
MK1641	1974	Northern Ireland 110 kV SC	MXM2095
MT1120	1973–75	L3(c)	MXM2758	“M” prefix added; drawing numbers do not appear to correspond to imperial L3
MT866	?	L8(c)	MXM866

J L Eve

Suite	Drawing series	Date range
MEE SL1 NEE SL2	~~C15~~ C23	1931
Eve C333	C333	?
Eve 0.175	C432	1946
		C579	1946
		C670	1953, 1970, 1973
L16 (Eve 0.4)	C534	1950
Eve L3 (original)	C673	1954–56, 1960 (terminal)
Eve L3 (original)		C916	—
Eve C772 (Eve 0.125)	C772	1957
Eve L3 (Scottish)	C864	1960 (line), 1955–56 (angle), 1960 (terminal)
Eve L6	C896	1962–65
Eve C1415 (Eve 0.125)	C1415	1970
Eve C1415 (Eve 0.125)		C1824 (metric)	1975

Watsham’s

Watsham’s drawing numbers do not appear to show any kind of internal numbering ranges. So far, no types are known to have exceed 100 drawings: the first two digits match for all known drawings within a tower series, but this is not guaranteed to be true.

Suite	Year(s)	Known drawing range
SEE SL2	1929	11xx
SEE SL3	1930	13xx
SEE SL4	1934	22xx
SEE SL8	?	27xx
SEE PL7	1938	28xx

Callender’s

Suite	Year(s)	Known drawing range
SEE PL1(b)	1929–30	H,14,0xx to H,14,2xx
SWE PL1(a)&(b)	1931	H,14,5xx

BICC