The Globemakers by Peter Bellerby
Author:Peter Bellerby
Language: eng
Format: epub
ISBN: 9781526650900
Publisher: Bloomsbury Publishing
Published: 2023-04-15T00:00:00+00:00
The other thing I had to contend with was accurately sizing the gores. The vertical measurement of a gore must be such that when stretched it finds its natural curved length and the edges lose their wrinkles â but no more or they lose the integrity of the curves and gaps appear between gores. The length of each side must almost exactly match the distance from pole to pole or pole to equator, as it barely stretches. Then there is the width; depending on the number of gores used, the width must find a distance of one-twelfth of the globe minus an accurate calculation for the stretch of each gore. Ultimately, if a sphere has 24 gores stretched around it, and if you lay each gore just 0.1 millimetre short widthways, then when you lay the final gore, a gap of 2.4 millimetres has opened. Obviously, a tenth of a millimetre is a tiny adjustment to gauge visually; even half a millimetre is difficult to work to, so minor adjustments as the gore dries are important, as is allowing for final shrinkage when dry. If you overstretch the paper widthways, because there is a lot of tension in the paper and little resistance, when the gore dries it will shrink and gaps will appear. The process required constantly measuring and re-measuring each gore to get it right first time, and ensuring that I allowed enough time between each gore application for the previous one to dry a little â and shrink â but again not too much, so that I stayed on track.
âTHE PROCESS REQUIRED CONSTANTLY MEASURING AND RE-MEASURING EACH GORE TO GET IT RIGHT FIRST TIMEâ
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