366 



CENTEAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



No. 9350. 



No. 9370. 



No. 9372. 



No. F7115. 



No. 9360. 



No. 9362. 



No. 9384. No. 9386. 



9350. MITRE BOX, Olmstead's. Can be used with ordinary hand saw, which will do perfect work and 

 not cut the frame away. Provided with iron guides for saw. Small size, will cut 1%-inch 



moulding, etc $1.95 



MITTENS, see Gloves. 



0360. MODELS, Atomic, Kekule and Von Baeyer, consisting of 20 black balls with four connecting 

 posts each, 10 red balls with two connecting posts each, 30 white, 10 yellow, 10 green, 10 

 violet, and 10 silver colored balls each with tubular attachments to slip on the connecting 



posts, and 15 nickel-plated binding posts with two clamps 45.00 



9362. MODELS, Valence, Nead's. The blocks representing the positive elements are provided with pins 

 which fit into corresponding holes in the blocks which represent the negative elements or radi- 

 cals. On each block is a clip for holding a card on which is printed the symbol of the element 

 represented. With these blocks valence, the idea of bonds between the atoms in combination, 

 and equation writing are made perfectly clear. The set includes 12 blocks for univalent elements, 

 6 for bivalent, and 4 for trivalent, half of each being positive, and 100 printed cards for symbols 



of elements and radicals 5.00 



MOIST CHAMBERS, see Culture Dishes. 

 MOISTURE TESTERS, see Grain Testing Apparatus. 



MOLD, Briquette, see Asphalt Testing Apparatus; Cement Testing Apparatus. 

 MOLDS, Cement, see Cement Testing Apparatus. 

 MOLDS, Cupel, see Cupel Molds. 

 9368. MOLD, Pouring, of cast iron with wood handle, with 3 conical depressions 2x1% inches each, 



tapering to a fine point, for crucible and scorification assays 75 



9370. MOLD, Pouring, of heavy solid iron, with six conical machine drilled depressions, 2 1 / 4xl% 



inches each, with iron handle, for crucible and scorification assays 2.50 



9372. MOLD, Pouring, of cast iron, with wood handle and two smooth drilled cavities 1.50 



9374. MOLDS, Pouring, cast iron, with wood handle and round holes, for crucible and scorification 

 assays. 



Number of cavities 6 12 



Each 75 2.25 



MOLECULAR WEIGHT DETERMINATION APPARATUS, see Physical Chemistry Appa- 

 ratus. 



F711.">. MONOCHROMATIC FLAME ATTACHMENT for Bunsen burners. A small reservoir which 

 slips over the top of the burner is provided with an asbestos wick at the center. This wick 

 surrounds the mouth of the burner closely and feeds up to the flame any solution placed in tho 

 reservoir. The flame is therefore continuously colored with the characteristic color of the salt 

 which is in the solution, and frequent renewals are not necessary, as only a small portion of the 

 dissolved substance is consumed. As the water evaporates more is easily supplied. For any 



burner with % -ineh tube > 1.50 



9384. MORTAR, Diamond, Leed's Form, of hardest steel. Pestle 50x15 mm 3.50 



9386. MORTARS, Diamond, Plattner's, of hardest steel. 



No A B 



Diameter of pestle, mm 15 25 



Each 4.50 6.00 



