222 



Measurement of Lengths, Angles, etc. 



No. 51437 



51443. 1:11. 



51457. 1:2. 



51444. 1:10. 



51.437. Steel Ruler, 1 m long (Standard Rule), divided on one side in millimetres and on the 

 other in English inches, in case 



51.438. Dividing Ruler, with steel angle rail, for rapidly dividing a length into 10 equal parts 

 (Fr. phys. Techn., Vol. I, 2, Fig. 2018) 



51.439. Standard Metre, divided in centimetres, of hard brass, 20 mm wide and 10 mm thick, 

 the first decimetre being divided into millimetres. In box 



. 1 ,440. Standard Metre, of brass. Figure, with millimetre graduation on silver, for reading 

 in conjunction with a telescope or microscope, extremely accurate, serving as comparing 

 measure in physical experiments. In case 



51.441. Standard Metre (H-section), with millimetre graduation on silver, the first and last 

 millimetres being divided in tenths, lines of extreme fineness on the neutral stratum, 

 for reading with the telescope or microscope 



This rule is massively constructed of a suitable metal alloy and is in accordance with the con- 

 ditions laid down by the Bureau International for the standardisation of this class of rule. Standar- 

 disation fee is quoted on application. 



51.442. Carrier for suspending rules Nos. 51,439 51,441 vertically, with clamps and ad- 

 justing device for the rule 



51.443. Demonstration Rule, Figure, 1.15 m long, arranged for horizontal and vertical 

 measurements 



51.444. Vertical Rule, Figure, 1.2 m long, on iron stand, with cursor and pointer, with 

 coloured centimetre graduation visible from a distance, and millimetre graduation, for 

 conveniently measuring heights (W. D., Fig. 47 [43]) 



."1,445. -- idem, with graduation 2 metres long 



."1,446. - - idem (Bebenstorff's), 1 m long, with cursor, number scale and coloured scale 

 in the German military colours (Ztschr. f. d. phys. u. chem. II. 18, 1905, p. 346). . 



In the coloured graduation from cm to cm gray signifies and 5, white 1 and 6, red 2 and 7, 

 yellow 3 and 8, blue 4 and 9. 



51,447. Simple Vertical Rule (Grimsehl's), millimetre rule on iron base with brass cursor . 



s. d. 

 0. 



0. 10. 



4. 0. 



7. 0. 



10. 0. 



6. 5. 

 1. 5. 



0. 18. 



1. 4. 



0. 18. 

 0. 12. 



(l. 



:,:IT.\ :i-j, 416, 

 413, 448K, 154. 



