|As in the previous collations, following is a key to the abbreviations
||Number engraved on plate, if any.
||Position of the chart in the Atlas.
||Appearance of the same, or similar, chart in other Colom Atlases listed
||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 of the paper
caused by changes in humidity and temperature over long storage periods
as well as from the results of restoration.
||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. For the purposes of these collations, all measurements
were taken from the scale bar in Duytsche mylen. 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 1°.
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.