LABORATORY SUPPLIES AND CHEMICALS 



193 



3208 HYDROMETER, Milk, giving percentage of water added ................ $1.25 



3212 HYDROMETER, Milk, N. Y. Board of Health, with thermometer ...... 3.00 



3214 HYDROMETER, Milk, Quevenne's ............... ....................... 1.50 



3216 HYDROMETER, Milk, Quevenne's, with thermometer .................... 3.50 



3218 HYDROMETER, Naptha, 40 to 100 Beaume ....................... 



3220 HYDROMETER, Salt, to 50 Beaume ............................. 



3222 HYDROMETER, Silver, or "Actinometer" ...................... ' . . 



HYDROMETER, Spirits, see Hydrometers for Alcohol. 

 3224. HYDROMETER, Sugar or Syrup, to 50 Beaume 



HYDROMETER, Sugar, see also Hydrometers, Brix's Scale. 



HYDROMETER, Urine, see Urine Analysis Apparatus. 

 3226 HYDROMETER, Vinegar .......................................... 



HYDROMETERS, see also under Oil Testing Apparatus. 



Note: There are a great many styles of Hydrometers, not listed herein, but 



which we are prepared to make. Prices upon application. 



LEach 



J 



3228 



3233 



3228 Hydroeik, an improved form of the Mason's Hygrometer. Consists of two 

 thermometers (wet and dry bulb) mounted upon the outer edge of a 

 chart, which has been plotted from new and corrected tables pre- 

 pared under the direction of the United States Weather Bureau. 



3232 The Mason Hygrometer, while invariably recognized as the most accurate 



and satisfactory of the many forms of hygrometers in use, has never 

 enjoyed the popularity which its merits deserve, owing to the annoy- 

 ing necessity of reference to complicated tables for determining the 

 Relative Humidity and Dew Point corresponding to the difference in 

 degrees between the wet and dry bulb thermometers at different tem- 

 peratures. 



The Hygrodeik chart, while complicated in appearance, is simplicity itself, 

 and obviates entirely the use of tables for temperatures between 20 

 and 200 F. Full instructions with each. $10.00 



3233 HYGROMETER, Mason's; with wet and dry bulbs. Lines drawn on the 



scale for convenience of maintaining a humidity of 50 at normal tem- 

 peratures of the living room; size, 8j4x4^ in 5-00 



HYGROMETER, U. S. Weather Bureau, consisting of two standard ther- 

 mometers, extending below the finely polished hardwood back, metal 

 cistern with wick and certificate for each thermometer 12.00 



