SCIENCE-GOSSIP, 



337 



10 millimetres 

 10 centimetres 

 10 decimetres 

 10 metres 

 10 dekametres 



(mm) 



(cmj 



(clem) 



(m) 



(dkm) 



Table of Lengths. 

 = 1 centimetre (cm) = 



10 hektometres (hkm) 



= 1 decimetre (dcm) = 



= 1 metre (m) = 



= 1 dekametre (dkm) = 



= 1 hektometre (hkm) = 109-363 yards. 



= 1 kilometre (km) = 1,000 metres. 



■3937 inch 

 3-9370 „ 

 39-3708 „ 

 10-936 yards. 



1 in. = 2-54 cm. 

 1 in. = -254 dcm. 

 = 1-0936 yards. 



19 



20 



21 



22 



"213 



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Pig 



1. 



















































































































































































































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Fig. 2. 



The usual contractions for the above measures 

 are given in Drackets. 



Comparison oetween some of these lengths will 

 be easily made from fig. 2. Fig. 1 shows the 

 actual sizes of centimetres and millimetres. 

 Akeas. 



Coming now to the second dimension, the unit on 

 the square measure will of course be the square metre; 

 and as again this particular size is not convenient 

 for all purposes, it has been treated in the same way 

 as the metre. The same distinctive n ames are applied 

 to the multiples and submultiples of the square 

 metre as to those of the first dimension unit. They 

 will here, of course be hundredth parts, not tenths. 



Table of Areas. 

 100 sq. mms. = 1 sq. cm. = -155 sq. inch. 



100 sq. cms. = 1 sq. dcm. = 15-500 sq. inch. 

 100 sq. dcms. = 1 sq. metre = 1550-058 sq. inch. 

 100 sq. metres = 1 sq.dkm. = 119-60 sq.yards 

 100 sq. dkms. = 1 sq. hkm. =11960-33 sq.yards 

 100 sq- hkms. = 1 sq. km. = 247 acres. 



1 sq. inch = 6-4514 sq. cms. 



1 sq. foot = 9-2899 sq. dcms. 



1 sq. yard = 0-8361 sq. metre 



Comparison between some of these areas can be 

 made from fig. 2, which shows the actiial size of 

 a square decimetre, divided into its 100 square 

 centimetres, one of which is also split up into its 

 100 square millimetres. In the centre is a square 



