Maps Included in Colom Atlases:

Collations by Jason Hubbard

The best existing reference for the pilot guides and Sea Atlases of Jacob Aertsz. Colom is the fourth volume of Atlantes Neerlandici by Dr. Ir. C. Koeman, published in Amsterdam in 1970.  However, at the time of publication, he noted that: "The bibliographical treatment is quite incomplete due to the lack of material". The following collations of two Atlases in the British Library and two more in private collections may begin to help in filling in some of the gaps.

Plate No:  Number engraved on plate, if any.
Pos: Position of the chart in the Atlas.
Ref: Appearance of the same, or similar, chart in other Colom Atlases listed by  Koeman.
Size: Height vs. width, within ½  cm.  As insets are mostly irregular, their measurements are frequently preceded by a   circa, or c.  Note that the measurements given for same chart included in two different Atlases can vary due to shrinkage or stretching caused by differences in humidity and temperature during storage and as a result of
Scale: Colom included a scale bar in the majority of his charts, showing Duytsche  mylen,  Spaensche mylen and  Engelse en Franse mylen.  15 German,  17.5 Spanish or 20 English or French miles corresponding, in turn, to    1º of latitude as measured along the equator.  All measurements were made using the Duytsche mylen bar. In converting, I have used the figure mentioned in Doursther, H.  Dictionnaire Universel des Poids et Mesures, republished by Meridian, Amsterdam, 1965.  Doursther states the German Meile as being 7.4089 km., so 15    German miles would represent  111,133.5 mts. or 1º.   I have chosen to show the resulting scale for each     chart, though these numbers should be taken as approximate due to the limitations involved in precise     measurement and the changes undergone by the paper over three and a half centuries as mentioned above.

The New Fierie Sea-Colomne, 1649
De Vyerighe Colom, 1654
Atlas or Fyrie Colom, 1668
Atlas ou Colom Ardante, 1668