Get The Physics of Christmas: From the Aerodynamics of Reindeer PDF
By Roger Highfield
ISBN-10: 0316054518
ISBN-13: 9780316054515
Can reindeer fly? Why is Santa Claus fats? may possibly scientists clone definitely the right Christmas tree? used to be the celebrity of Bethlehem fairly a comet? Why is Rudolph's nostril crimson? How does Santa be capable to bring provides to an envisioned 842 million families in one evening? What might we do to assure a white Christmas each year? those are one of the questions explored in an irresistibly witty e-book that illuminates the loved rituals, legends, and icons of Christmas from a different and engaging viewpoint: technological know-how.
Read or Download The Physics of Christmas: From the Aerodynamics of Reindeer to the Thermodynamics of Turkey PDF
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Extra resources for The Physics of Christmas: From the Aerodynamics of Reindeer to the Thermodynamics of Turkey
Sample text
In trying to produce a careful and slowly made freehand copy such variations in pressure are difficult to reproduce. Because they arise from the speed of natural movement they cannot be produced when the hand is moving slowly and is consciously controlled to imitate an unfamiliar pattern. Instead, the slowly moving pen is maintained at a more constant pressure on the paper, and the written line is therefore more even in width and its end not ‘tapered’ but blunt. 35 The Scientific Examination of Documents Figure 5 On the right-hand side of the picture a genuine signature is shown.
Thick-nibbed fibre or felt tipped pens have little effect on the actions of the writer, but the examiner may find difficulty in establishing the pen movement from his examination of the writing. 28 Modification of Handwriting Writing position When writings are made in awkward positions such as standing with a pen in one hand and a notebook in the other the control of the pen is less than when writing is made in ideal conditions. Examples of this may occur when a registered or recorded delivery is signed for at the door at the request of the postman.
To trace a signature it is necessary that the shape of the model to be copied is placed in the right place on the appropriate document. This can be done in a number of ways. A piece of carbon paper can be placed on the document and the signature to be copied placed over it. Light pressure of a pen following the line of the signature will produce a ‘carbon’ impression on the lower document. This can in turn be overwritten with ink to produce a realistic simulation of the original. Another way is to place the original on the document where the copy is required and to trace heavily along the line of writing so that impressions are made on the paper below.
The Physics of Christmas: From the Aerodynamics of Reindeer to the Thermodynamics of Turkey by Roger Highfield
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