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MICROSCOPE-ANTIQUES.COM     2013-15.




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 11 11 11 11 11 11 11
ROYAL 11 11 11 11 11 11 ? 11 11
 115/8
11 12 12
115/8
VAN HEURCK 13 1/8 --- --- 13 1/8 13 1/8 13 1/8 13 1/8 12 12 12 12 12 12 13 ?
CS VAN HEURCK 13 1/8 13 1/8 13 1/8 12 12 12 12 12 12 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 8
VAN HEURCK --- --- --- --- 9 9 9 7 7 7 7 7 7 8
CS VAN HEURCK 9 9 9 7 7 7 7 7 7 8
GRANDVAN HEURCK >10 >10 >10 >10 >10 >10 9 9 9 9 9 9 9 9
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   33/8 80 mm
ROYAL 33/8 33/8 33/8 80 mm
VAN HEURCK 4 diam. 4
diam.
4 diam. 5
diam.
5
diam.
5
diam.
5
diam.
5
diam.
5
CS VAN HEURCK 4
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  ( H)

1(V)
1  ( H)

1(V)
1  ( H)

1(V)
1  ( H)

1(V)
1  ( H)

1(V)
ROYAL 1 (H)

1(V)
1  ( H)

1(V)
1  ( H)

1 (V)
1   ( 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  ( H)

1(V)
1  ( H)

1(V)
1  ( H)

1(V)
1  ( H)

1(V)
CS 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)
GRAND VAN HEURCK 1 (H)

1(V)
1 (H)

1(V)
1 (H)

1(V)
N/A 2 (H)

1 (V)
2 (H)

1 (V)
2 (H)

1 (V)
2 (H)

1 (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 1
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(?)