Arnold And Son , Globetrotter World Time , Horology Deconstructed

High resolution, book format. Deconstruction Arnold & Son Globetrotter World time by THE NAKED WATCHMAKER Images from www.thenakedwatchmaker.com All texts, photographs and illustrations are Copyright ©2018 The Naked Watchmaker Edition A&S1a Formatted for use on mobile telephones, laptops and tablets. All rights to this publication are reserved. It would be appreciated by the author that no part of this book may be reproduced, copied or transmitted in any form or by any means, electronic or mechanical, including photocopy, xerography and videography recording, with out the permission of The Naked Watchmaker. John Arnold Born in Cornwall, England in 1736 and died 11 August 1799. His father was a watchmaker and his uncle a gunsmith, he left England for the Netherlands at the age of 19 after completing his apprenticeship in watchmaking. He established himself as a watchmaker of repute in London’s Strand by his twenties. Arnold & Son was recreated in 1995, they are today a Swiss company based in La Chaux de Fonds, Switzerland producing mechanical watches, designs, technologies and prices philosophy influenced from the original direction of the company. Globetrotter A world time wristwatch with an earth domed upper hemisphere viewed, centred on the North Pole. The crown has three-positions. The first is used to manually wind the movement, the second position sets the local time (hour hand) in onehour increments, and the final position is used to set the hour and minute hands and the world-time. Both the main time display, as well as the world-time function, can be adjusted forwards and backwards. The case is stainless steel, diameter 45 mm, cambered sapphire with anti-reflective coating on both sides. Total thickness: 17.2 mm between sapphires, water resistant to 30 metres. The domed hemisphere is machined from a round piece of brass. The different textures of the oceans and continents are brought out by chemical etching using a mask to protect the higher surfaces, followed by polishing the upper surfaces. The mountainous areas are then sandblasted to create a sense of visual depth, then the oceans are lacquered by hand with different blue tones. The entire world-time disk is then treated with a layer of clear lacquer. Calibre A&S6022, automatic, 29 jewels, diameter 39mm, thickness 6.55 mm without earth and bridge, 14.00 mm with earth and bridge, power reserve 45 h, 28’800 vibrations/hour. The hemisphere below has been personalised for a particular order for a client in Turkey, (the reason for the highlighted land mass in red). The dial is CNC machined from brass, then lightly sandblasted in the centre, and circulargrained around the minute track before being silver plated. Then the dial is printed with the black details. The dial is held onto the movement by three screws and two steady pins. The large bridge which traverses the hemisphere supports the sapphire disc and covers the central nut that holds the hemisphere in place. Transparent and metallized 24-hour sapphire. The hands are made from hardened, blued steel and the tips are lacquered manually, remaining translucent to be able to view the hours they cross. Dial side of the movement showing the large plate which supports the dial and hemisphere. The tall central assembly which carries the minute and hour hands at the bottom, underneath the hemisphere. The domed hemisphere is then held onto the square section at the top and secured with a nut. The world time assembly. Given the weight of the hemisphere, the overall construction is heavily engineered to be able to absorb the inevitable knocks the watch will experience