FINAL DRAFT UGANDA 
STANDARD  
  DUS 1984  
First Edition  
2019 -mm-dd 
 
 Reference number  
DUS 1984 : 2019 
© UNBS 2019   
  
Geometry  sets — Specification  
 DUS 1984 : 2019  
ii © UNBS 2019 – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct applicatio n 
© UNBS 2019  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS . 
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 417 333 2 50/1/2/ 
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  
 
 DUS 1984 : 2019 
© UNBS 2019 – All rights reserved  iii 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws of Uganda , as amended .  UNBS is mandated to co -
ordin ate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT  Agreement  of the World Tr ade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, acad emia, consumer groups, private sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending  the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Technical Committee UNBS /TC 9, Metrology  
 
. 
 FINAL DRAFT UGANDA STANDARD  DUS 1984 : 2019 
 
1 © UNBS 2019  – All rights reserved  
 Geometry  sets — Specification   
1 Scope  
This Draft Ug anda Standard covers the requirements of school type geometry sets, namely, Grade 1 . 
2 Normative references  
There are no normative references in this document.  
3 Terms and definitions   
No terms and definitions are listed in this document.  
4 Instruments  
4.1 Geometry sets shall contain  each of the following instruments : 
a) compasses;  
b) dividers;  
c) protractor which is semi -circular;  
d) pair of set squares, 45 ⁰ and 60 ⁰; and 
e) measuring scale.  
4.2 Geometry sets shall include  accessories like pencils, rubbers and sharpeners.  
5 Materials  
5.1 The set squares,  measuring scale and pr otractor in geometry set s shall be made of transparent plastic 
material . 
5.1.1 The rec ommended plastic materials are polystyrene, acrylic or rigid polyvinyl chloride. The material 
shall be smooth, even on all sides and free fr om blisters, porosity and other defects.  
5.1.2 The tinplate shall be bright and clean, reasonably free from spots an d other defects, and shall be 
thoroughly and evenly coated on both sides .  
5.2 Compasses and dividers in geometry sets  shall be made from zinc base die cast alloy .  
5.3 The needles shall be made from suitable steel  and properly heat treated.  DUS 1984 : 2019  
2 © UNBS 2019 – All rights reserved  
 5.4 Every  geom etry set shall be made from tin  sheet or plastic material with a provision for keeping  the 
instruments separately. It shall have a flat lid, well fitting, easy to open and without  sharp edges. The minimum 
thickness of the tin sheet and plastic material  used shall be 0.315 mm and 2 mm respectively . 
6 Manufacture  
6.1 Compasses and dividers shall have a screwed hinge . 
6.2 Compasses and dividers shall be made as illustrated in Fig ure 1. The  compasses shall be provided with 
a suitable arrangement for securely  holding the pencil. The diameter of the hole for holding the pencil and  the 
thickness of the ring for tightening the pencil shall not be less than  8.2 mm and 2 mm . In the case of dividers, 
the distance between the two legs in fully  closed position shall not  exceed 1 mm.  
 
 
Figure  1 — Divider and compass (screwed type)  
6.3 The set squares, protractor shall be made as illustrated in figures 2 to 6. In set squares and the 
measuring scale, both the edges shall carry centimetre graduation marks.  
 DUS 1984 : 2019 
© UNBS 2019 – All rights reserved  3 
 
 
Figure 2 — Set squares, open centre pattern  
 
 
 
Figure 3 — Set squares,  centre hole pattern  DUS 1984 : 2019  
4 © UNBS 2019 – All rights reserved  
 
 
Figure 4 — Protractor, semi -circular, open centre pattern  
 
Figure 5 — Protractor, semi -circular, solid pa ttern  
 
 
Figure 6 — Measuring scale  DUS 1984 : 2019 
© UNBS 2019 – All rights reserved  5 
 6.4 Set squares shall be of centre  hole or open centre pattern, if made from plastic sheet. In the open 
centre pattern, the minimum distance from the opening to the edge shall not be less than  15 % of the nominal 
size. 
6.5 The protractor s hall be of open centre pattern,  and of solid patter n, if made from plastic sheet.  
6.6 The finish of the surface and edges of the set squares, protractor and measuring scale shall be smooth . 
7 Dimensions and tolerances  
7.1 Set squares and protractor  
The dimensions and tolerances for the set squares and pro tractor shall be as specified in Table 1 and Table 2 
respectively.  
Table 1 — Dimensions and tolerances for set square s 
All dimensions are in millimetres  
Designation  size Tolerance on linear  
dimensions  Thickness of plastic 
material min. Thickness of 
tinplat e min. Angular  tolerance  
45⁰ 
100 ± 1.5  1.5 0.56 ± 15´  
60⁰ 
125 1.5 1.5 0.56 ± 15´  
 
Table 2 — Dimensions and tolerances for the protractor  
All dimensions are in millimetres  
Diameter  Tolerance on 
diameter  Thickness of plastic 
material  min. Thickness of 
tinplate  min. Graduation  Angular 
tolerance  
Semi -circular  
100 ± 1.5  1.5 0.56 1’ ± 15´  
 
7.2 Measuring scale  
7.2.1  The dimensions for the measuring scale shall be 160 x 25 mm . 
7.2.2 In the case of measuring scale made of plastic, the thickness at the centre s hall be not less than 2 
mm and the measuring scaIe shall have  a shaped cross section.  
7.2.3 The total error for the entire length of the graduated part of the measuring scale shall not exceed ± 0.5 
mm. DUS 1984 : 2019  
6 © UNBS 2019 – All rights reserved  
 8 Graduations  
8.1 All graduations shall be cut, stampe d or engraved on set squares, protractor and measuring scale. The 
graduations shall be clear, uniform , fine and filled with black colour so as to ensure good legibility without the 
use of  a magnifying glass. The thickness of the graduation lines shall not exceed 0.2 mm.  
8.2 The set squares, protractor and measuring scale  shall comply with the recommended lengths for 
graduations given in Table 3.  
Table 3  — Recommended lengths for graduations  for set squares, protractor and measuring scale  
Instrument  Nominal  length  
mm 
Set squares : 
 cm graduations 10  
 5-mm graduations  
 mm graduations   
10 
5 
3 
Semi -circular protractor : 
 10-degree graduations  
 5-degree graduations 5  
 1-degree graduations   
10 
5 
3 
Scale : 
 cm graduations  
 5-mm graduations  
 mm graduations   
8 
5 
2.5 
 
8.2.1 The semi -circular  protractor shall be double reading and shall be figured at every lo-degree 
graduation. The outer figures shall read clockwise  from the horizontal line starting from left and those on the 
inner side shall read anticlockwise starting from  the opposite end. The height of the figures shall be between 
2.0 mm and 2.5 mm for protractor. The minimum height of the figures in the case of set squares shall be 2.5 
mm. The circumference of the semicircular protractor shall be graduated on the undersi de by radial lines for 
transparent protractors and on the upper side by radial lines for those made from tinplate or opaque plastic 
material. Set squares and the measuring scale shall be figured at every centimetre graduation . 
8.2.2 In semi -circular  protra ctor, no graduations shall extend beyond the base line (which is the line joining 
the graduations 0 ⁰ and 180⁰). The base line shall be at least 3 mm away from the bottom straightedge and 
parallel to it.  
8.2.3 Two straight lines, one in continuation of grad uations 0⁰ to 180⁰ and the other perpendicular to it 
through 90 ⁰ graduation mark shall be drawn completely to meet at the centre in case of protractor of solid 
pattern as illustrated in Fig ure 5. In the case of protractors of open centre pattern, a line sh all be drawn joining 
the graduations 0 ⁰ and 180 ⁰. A perpendicular line, which on extension shall coincide with the graduation mark 
of 90 ⁰, shall be marked to indicate the centre of the circumference . 
9 Marking  
9.1 The set squares, protractor, measuring scale, compasses and dividers shall be  Iegibly and indelibly 
marked with maker’s name or trade -mark at a suitable place.  
9.2 Each geometry set  shall be marked with the maker’s name on one of its faces.  DUS 1984 : 2019 
© UNBS 2019 – All rights reserved  7 
 9.3 Geometry sets may also be marked with the Certificati on Mark.  DUS 1984 : 2019  
8 © UNBS 2019 – All rights reserved  
 Bibliography  
IS 2533 :1978, Specification for geometry boxes  
 DUS 1984 : 2019  
9 © UNBS 2019  – All rights reserved  
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of t he UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with t he rele vant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification ma rk scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bur eau of Standards.  
 
 DUS 1984 : 2019    
 
ICS nn.nnn.nn  
Price based on nn pages  
© UNBS 2019  – All rights reserved