Twaddell's No. 6 hydrometer, scale 138-170.
Twaddell no 1 hydrometer
1920-1960
Twaddell hydrometer
1920- 1960
Twaddell no 6 hydrometer
1920-1960
Twaddell no 4 hydrometer
1920-1960
Twaddell's No. 4 hydrometer, scale 74-102.
Twaddell no 6 hydrometer
1920-1960
Twaddell's No. 3 hydrometer, scale 48-74 (broken).
Glass Twaddles' hydrometer
Twaddell 0/6 hydrometer
Twaddell no 4 hydrometer
1900-1960
Twaddell no 1 hydrometer
1900-1970
Glass Twaddle hydrometer
Twaddell no 4 hydrometer
1920-1960