ISO INTERNATIONAL STANDARD 12858-1 Secondedition 2014-08-01 Optics and optical instruments Ancillary devices for geodetic instruments - Part 1: Invar levelling staffs Optique et instruments d'optique-Equipementsannexes pour les instrumentsgeodesiques Partie 1:Mires de nivellement en invar Reference number ISO 12858-1:2014(E) LSO @IS02014 Not for Resale IS012858-1:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Case postale 56.CH-1211 Geneva 20 Tel. +4122 749 0111 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproduction or networking permited without license from IHS Not for Resale IS0 12858-1:2014(E) Contents Page Foreword ..iv Introduction.. 1 Scope.. 2 Normativereferences 3 Termsanddefinitions 4 Design ..1 5 Invarscalestrip .1 6 Scale and scale numbering ..2 6.1 Classical staff .2 6.2 Staffs for digital levels .2 7 Zero-pointerror. ..3 8 Baseplate ..3 9 Accessories. ..3 10 Circularlevel ..3 11 Designation and marking ..3 AnnexA(informative)ExamplesofInvarlevellingstaffs .4 iii vithoutlicense from IHS Not for Resale