A COMPARISON OF THE WATSON EDINBURGH (H), ROYAL, AND VAN HEURCK MODELS THROUGH THE YEARS:

c. 1893-1940

Maker: W. WATSON & SONS LTD.

All measurements are reported in inches, unless otherwise noted. Gray cells indicate the model was not yet made at that time. Pink cells indicate a change in a dimension, though at times these were minor. Note that measurements are approximate and actual measurements have shown those quoted in the catalog to be inaccurate by as much as 1/4 inch. This is particularly true of the spread of the feet, which, measured outside edge to outside edge, is often smaller than the spread reported in the various catalogs. Also note that, until sometime after 1929, the 'Royal' was always the same size or smaller than the Edinburgh 'H' except for the diameter of the double draw tube; if the Edinburgh 'H' was ordered with a double draw-tube they would be essentially identical.

ABBREVIATIONS: SGD: single graduated draw tube; RDD: rack and pinion double draw tube; V:vertical or X axis; H: horizontal or Y axis.

	EDITIONS	?	13	?	15	16	17	18	22	25	28	29	33	34	35	36
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
HEIGHT	EDINBURGH H	12	12	12	12	12	12	12	11 ½	11 ½	11 ½	11 ½	11 ½	11 ½	11 ½	11 ½
	ROYAL				11	11	11	11	11 ¼	11 ¼	?	11 ¼	11¼  115/8	11 ¼	12 ¾	12 ¾ 115/8
	VAN HEURCK	13 1/8	---	---	13 1/8	13 1/8	13 1/8	13 1/8	12 ½	12 ½	12 ½	12 ½	12 ½	12 ½	13 ¾	?
	CS VAN HEURCK					13 1/8	13 1/8	13 1/8	12 ½	12 ½	12 ½	12 ½	12 ½	12 ½	14	?
	GRANDVAN HEURCK		14	14	14	14	14	14	14	14	14	14	14	14	14	14
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
FOOT SPREAD	EDINBURGH H	7	---	---	---	---	7	7	7	7	7	7	7	7	7	7
	ROYAL				7	7	7	7	7	7	7	7	7	7	8 ½	8 ½
	VAN HEURCK	---	---	---	---	9	9	9	7 ¾	7 ¾	7 ¾	7 ¾	7 ¾	7 ¾	8 ¾
	CS VAN HEURCK					9	9	9	7 ¾	7 ¾	7 ¾	7 ¾	7 ¾	7 ¾	8 ¾
	GRANDVAN HEURCK		>10	>10	>10	>10	>10	>10	9 ¾	9 ¾	9 ¾	9 ¾	9 ¾	9 ¾	9 ¾	9 ¾
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
STAGE SIZE	EDINBURGH H			3.5 X 3.5				33/8	33/8	3  ½		33/8	80 mm
	ROYAL							33/8	33/8			33/8	80 mm
	VAN HEURCK	4 ½ diam.			4 ½ diam.	4 ½ diam.		5 diam.	5 diam.	5 diam.	5 diam.	5 diam.	5
	CS VAN HEURCK					4 ½ diam.		5 diam.	5	5 diam.	5 diam.	5 diam.	5 diam.
	GRANDVAN HEURCK				4 5/8 diam.	4 5/8 diam.		5 diam.	5 diam.		5 diam.	5 diam.	5 diam.			5 diam.
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
STAGE APERTURE	EDINBURGH H
	ROYAL
	VAN HEURCK	1 7/8"			1 7/8"	1 7/8"		1 7/8"
	CS VAN HEURCK					1 7/8"		1 7/8"
	GRANDVAN HEURCK
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
MECH STAGE TRAVEL	EDINBURGH H							1 (H) 1(V)	1 (H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)			1 ½ ( H) 1(V)
	ROYAL							1 (H) 1(V)				1 ½ ( H) 1(V)	1 ½  ( H) 1 (V)			1 ½  ( H) 1 (V)
	VAN HEURCK	1 (H) 1(V)	1 (H) 1(V)	1 (H) 1(V)	1 (H) 1(V)			1 (H) 1(V)	1 (H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)
	CS VAN HEURCK							1 (H) 1(V)	1 (H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1(V)	1 ½ ( H) 1 (V)
	GRAND VAN HEURCK				1 (H) 1(V)			1 (H) 1(V)	1 (H) 1(V)	N/A	2 (H) 1¼ (V)	2 (H) 1¼ (V)	2 (H) 1¼ (V)			2 (H) 1¼ (V)
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
STANDARD TUBE TYPE	EDINBURGH H	SGD	SGD	SGD	SGD	SGD	SGD	SGD	SGD	SGD	SGD	SGD	SGD
	ROYAL							RDD				RDD	RDD
	VAN HEURCK	SGD (A) RDD (B)	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD
	CS VAN HEURCK					RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD
	GRANDVAN HEURCK		RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD	RDD
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)
OUTER TUBE DIAMETER	EDINBURGH H							1 ½				1 ½
	ROYAL											?	2"			40 mm
	VAN HEURCK											?
	CS VAN HEURCK											?
	GRANDVAN HEURCK											?
PARAMETER	MODEL	1893	1896	1898	1900	1902	1904	1906	1912-13	1918	1921	1923	1928	1929	----	1936(?)