226 



BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



Explanation of Baume s Scale. Manufacturers who em- 

 ploy Baume's hydrometer, or have occasion to know the 

 value of the degrees on his scale, may find the following 

 formula useful. 



Let B = Baume's degree, and 100 = water. Then 

 Specific gravity = ~^ 



r^ o */ j A\ D 



That is to say, 144 divided by the difference between 144 

 and the given degree of Baume, is the specific gravity in 

 question, stated in reference to water assumed = 100. 

 Thus, suppose Baume = 66. Then, 

 Specific gravity = j^g or ~ = 1.846 = specific gravity. 



Scale of Specific Gravities indicated by TwaddelVs Scale. 



Fig - 24a Hydrometer with Weights. 



(Fig. 240.) There is 

 a variety of kinds of hy- 

 drometers, with weights ; 

 the principal ones are 

 Dica's and Sike's, they 

 are used for ascertaining 

 the strength of spirituous 

 .liquors. One packed in a 

 case is here represented, 

 and is formed wholly of brass, and may be described 

 as consisting of three parts ; the scale, the ball, and the 

 stem, which terminates in a small knob, intended to keep 

 the instrument upright when in use. Upon this being put 

 into a long glass, containing spirits of wine, etc., it will sink 

 to a certain depth. If the spirit be very weak, it may not 

 sink low enough to cover the ball, in which case one of the 

 weights is placed above the knob of the lower stem. Ac- 

 cording to the weight used, and the degree to which the 

 instrument sinks, reference being had also to the tempera- 

 ture of the fluid, the degree of strength is ascertained. 



Price, $12 to $25. 



