186 NEGEETTI AND ZAMBRA, HOLBOEN VIADUCT, B.C., 



Each. 



485 Lactometer Tubes, or Creamo-meters, graduated to show the 



percentage of cream ; a set of six in mahogany frame . . . 16 6 



486 Ditto, a set of three tubes in frame (fig. 486) . . . 10 6 



489 Cream Test Jars, graduated to show percentage (fig. 489) .056 

 Ditto ditto, smaller . . . .036 



490 Thermometer, add or subtract, for use with above. (See also Dairy 



Thermometers) 076 



491 Lactometer Glass, with Thermometer and Test Jar, in Mahogany 



Box (as fig. 425) 150 



492 Thermometers for Dairy Use entirely mounted in glass (fig. 492) 



3s. 6d. and 056 



493 Lactometer, Gilt Metal, Specific Gravity Scale . . . 12s. 6d. 1 5 



494 Ditto, ditto Gilt Metal with Thermometer and Test Jar, in 



Mahogany Box (as fig. 425) , .220 



495 Centesimal Galactometer, Glass (Dr. HassaU's) . . . . 10 6 

 Lactometers being adjusted to a temperature of 60 Fahr., all trials must be 



made at that temperature. Should, however, that be inconvenient, then for every 

 five degrees of diiference in temperature, make a difference of one degree on the 

 Lactometer scale, adding the degrees of temperature if above 60, and subtracting 

 them if below GO . For greater convenience, Thermometers are made by NEGRETTI 

 and ZAMBRA to show at a glance the amount to add or subtract for difference of 

 temperature. 



FEOM EXPEEIMENTS MADE, IT IS POUND THAT THE SPECIFIC GRAVITY INDICATED BY 



496 THE LACTOMETER SHOULD BE AS FOLLOWS : 



For Cows' Milk . . . . 26 to 38 

 Cows' do. (grass-fed) before 



being Creamed . . . 32 



Cows' milk (grass-fed) the 



cream being taken off . 38 



Woman's ditto . . . 28' 38 



Ass's ditto , 30 34 



For Goat's do. (house-fed) . .30 34 

 Milk of Ewes (grass-fed) 



before being creamed . . 36 



,, Ditto ditto, the cream being 



removed . . . . 46 



Mare's milk . . . . 36 



DR. HASSALL. 



497 Sheffer's Hydrometers, one from '700 to 1000, the other from 1000 to T900 



with solution tube, per pair (figs. 453 and 453*) . . . . 15 



498 Cartier's Hydrometer, chiefly used in France for testing fluids lighter than 



water. It is a modification of Baume's spirit hydrometer, the same point 

 being taken as the zero of the scales. The space which in Baume's scale is 

 divided into 32, is in Cartier's divided into 30 . . . .060 



499 Gay Lussac's Alcohometer or Hydrometer, for testingjthe strength of spirits 



mostly used in France. The scale is divided into 100 parts, the lowest 

 division, marked at the bottom of the scale, denotes the specific gravity of 

 pure water at a temperature of 15 Cent, or 59 Fahr. The highest division 

 at the top of the scale indicates the specific gravity of absolute alcohol of 

 sp. gr. '796 at the same temperature. The intermediate degrees indicate 

 the number of volumes of such alcohol in 100 volumes of the spirit 

 tried 060 



500 Baumes' Saccharometer floats at 30 in a solution the Specific Gravity of which is 

 1'26 this is the density of Simple Syrup when boiling ; hence if the Saccharometer floats 

 at 30 in a solution of Sugar, when boiling it is inferred that such solution will be exactly 

 saturated when cold. The scale is sometimes graduated to indicate the proportion of 

 Sugar in the solution under examination. 



