CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



299 



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No. 7322. 



7289. CONTACT GONIOMETER, Penfield's Model A. For measuring internal angles and for use 



where an arm protractor cannot be employed. Consists of two pairs of measuring arms with 

 separate protractor, about 8x15 em $0.60 



7290. CONTACT GONIOMETER, Penfield's Model B. As it is difficult to adjust a transparent edge 



in exact contact with some surfaces, a modified form of No. 7288 is made for measuring crystals, 

 having the celluloid arm opaque for a portion of its length. Dimensions about 6x10.5 cm. .60 

 For other PROTRACTORS, see Catalog P of Physical Apparatus. 

 GRADUATES, Cylindrical, see Cylinders, Graduated. 

 7292. GRADUATES, Glass, Cone Shape, metric measure. 



Capacity, cc 30 60 100 200 250 500 1000 



Each..' 36 .40 .45 .60 .65 1.00 1.70 



7294. GRADUATES, Glass, Cone Shape, metric and English measure, double graduation. 



Capacity, ounces 123 6 8 16 32 



Capacitv, cc 30 60 100 200 250 500 1000 



Each . ." 38 .50 .56 .76 .90 1.30 2.20 



7296. GRADUATE, Glass, Cone Shape, new form, of heat resisting glass, permitting the use of hot 

 liquids with minimum danger of breakage. The graduations are on the inside, being produced 

 in such a way as to render them mathematically accurate. As the marks are in direct eon- 

 tact with the liquid, accurate adjustments are easily made. Graduated to 250 ce and to 



8 ounces -75 



GRADUATED FUNNEL for Creosote, see Funnels. 



GRAIN TESTING APPARATUS 



BALANCES, Grain Testing, see general heading Balances. 



BALANCE WEIGHTS, see Balances. 



BOTTLES, Grain Sample, see Nos. 1756 and 1758. 



7310. GERMINATING BOX for showing proper depth to plant seeds. Of galvanized iron 15 inches 

 long by 8 inches high, with glass front and back % of an inch apart, making it easy to ob- 

 serve the germination of seeds planted at different depths. Complete with metal shields to 

 exclude light from the sides. (See Farmer's Bulletin No. 218 of the United States Department 

 of Agriculture) 3.75 



7312. GERMINATING BOX, Ganong Pattern, for sprouting and observing root growths. Light, rust- 

 proofed metal box with inclined glass front. Dimensions, 7% inches long, 5 inches deep, 59i 

 inches wide at the top, 4 inches wide at the bottom .90 



7314. GERMINATING PLATE, of heavy glazed earthenware, 10 inches in diameter. For holding 

 moist blotting paper in germination experiments >. .30 



7316. GERMINATING PLATE, of porous clay, 9 inches in diameter. Obviates the use of blotting pa- 

 per in germination experiments .24 



3592. GERMINATING PLATE, of porous clay, 4^6 inches in diameter by 7{ 6 inch deep, with straight 

 sides 20 



