376

MODERN PAPER-MAKING
specific gravity of solutions of caustic soda (60° F.= i5° C.).

Twaddell 	Grammes
per Litre
NazO 	Twaddell 	Grammes
per Litre
Naf> 	Twaddell 	Grammes
per Litre
Na£> 	
I 	3-7 	26 	100.5 	5i 	223.4 	
2 	7-5 	27 	105.0 	52 	208.9 	
3 	n-3 	28 	109.6 	53 	234-4 	
4 	I5-I 	29 	114.1 	54 	240.0 	
5 	18.8 	30 	118.6 	55 	245-5 	
6 	22.6 	3i 	123.2 	56 	251.0 	
7 	26.4 	32 	127.7 	57 	256.6 	
8 	30.2 	33 	132.2 	58 	262.1 	
9 	33-9 	34 	136.8 	59 	267.6 	
10 	37-7 	35 	I4I.3 	60 	273.2 	
ii 	41.6 	36 	145-8 	61 	279-3 	
12 	45-5 	37 	150.4 	62 	285.4 	
13 	49-4 	38 	154.9 	63 	291.5 	
14 	53-2 	39 	159-4 	64 	297.7 	
15 	57-1 	,40 	164.0 	^5 	303.8 	
16 	61.0 	41 	169.4 	66 	309.9 	
17 	64.9 	42 	174-7 	<57 	316.0 	
18 	68.8 	43 	180.1 	68 	322.2 	
19 	72.7 	44 	185.5 	69 	328.3 	
20 	76.5 	45 	190.9 	70 	3344 	
21 	80.4 	46 	196.3 	71 	340.8 	
22 	84.3 	47 	201.7 	72 	347-2 	
23 	88.2 	48 	207.0 	73 	353-6 	
24 	92.1 	49 	212.4 	74 	360.1 	
25 	96.0 	50 	217.8 	75 	366.5 	
note.—To find Ib. soda (Na O) per cubic foot, divide grammes per litre by 16