Cosmic View: The Universe in 40 Jumpsby Kees Boeke (1957) page 6
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1. The first picture, from which we start, is as we said already one of a child sitting in front of the school, with a cat on her lap. It is drawn on a scale of 1 to 10. This means that a centimeter on the drawing is in reality 10 centimeters. A centimeter (abbreviated "cm.") is the hundredth part of a meter, which corresponds to the yard as a unit of length. To be precise, a meter is 3.37 inches longer than 1 yard. One centimeter is therefore nearly 0.4 inch. In both length and height, the picture measures 15 centimeters, or nearly 6 inches. An arrow shows the direction of north.

 1 cm. in picture = 10 cm. in actuality. Scale of picture therefore = 1:10

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