BAIRD &TATLOCK (LONDON) LTD. 



HYDROMETERS FOR USE AT 60 F. 



Twaddell's Scale, each degree is equal to 5 sp. gr. ; for instance, 24 Twaddell is equal 

 to 1. 12 sp. gr., as 24 X 5 = 120 + 1000 = 1.120 sp. gr. 



Twaddell 



No. i o to 24 = i.oo to 1. 12 sp. gr. 



2 24 48 = I.I2 1.24 



3 48 74 = 1.24 1.37 



4 74 102 = 1.37 1-51 



5 102 138 = 1.51 1.69 



6 138 170 = 1.69 1.85 



3256-3257 



s' M'H K 



3258 



3258 



Enlarged section of bulb. 



its' FBI i a < l 



3259 



!56 Twaddell's Hydrometers, Resistance Glass, Nos. i to 6, with shot, pear-shaped bulb, 



total length about 8 in. . . . . . . . . each, 1/1 ; per doz. 12 6 



!57 Twaddell's Hydrometers, Resistance Glass, Nos. i to 6, with mercury, pear-shaped 



bulb, totallength about 8 in. .. .. .. .. each, 1/3 ; per doz. 14 6 



!58 Twaddell's Hydrometers, Nos. i to 6, extra strong, will not roll when laid down, or 



revolve in the liquid .. .. .. .. .. each, 1/6; per doz. 17 



!59 Twaddell's Hydrometers, Resistance Glass, i to 6, with mercury, cylindrical bulb, total 



length about 6 in. .. .. .. .. .. each, 1/2 ; per doz. 13 



160 Twaddell's Hydrometers, brass, about u in. total length, Nos. i, 2, 3, and 4 each 12 



617 



