A text-book of dental histology and embryology, including laboratory directions . apparatusis necessary. A circular piece of steel made flat on the uppersurface is mounted on three legs 1\ to 2 inches high. Thesteel disk should have two rows of holes around its periphery,the one row f inch inside the other. A hard rolled toolsteel wire, or rod ?$% inch in diameter, should exactly fitthese holes. These rods should now be bent at right angleswith a short nib on the end, bent again at right angles, sothat it will point downward when the free end of the rodis set into one of the holes. The length
A text-book of dental histology and embryology, including laboratory directions . apparatusis necessary. A circular piece of steel made flat on the uppersurface is mounted on three legs 1\ to 2 inches high. Thesteel disk should have two rows of holes around its periphery,the one row f inch inside the other. A hard rolled toolsteel wire, or rod ?$% inch in diameter, should exactly fitthese holes. These rods should now be bent at right angleswith a short nib on the end, bent again at right angles, sothat it will point downward when the free end of the rodis set into one of the holes. The length between these twoangles should vary from f to 1J inches in three dozen ormore pieces which should be prepared. The end whichgoes in the holes should be cut so that it will not quitereach the surface of the table when dropped into the holeswith the end of the nib on the surface of the circular rods are called dogs (Fig. 347.) 464 APPENDIX CHAPTER I With this arrangement a warming box arranged with athermostat to maintain an even temperature, sufficiently Fig. 347. The spider with a grinding disk upon it and a specimen laid on and secured by bentrods called dogs. When these dogs are placed and pressed down through the holes inthe disk of the spider, they hold fast. With a little pressure of the finger outwardon the end of the rod below the disk of the spider, the dog slips up and is loose. Thedisk of the spider is three inches in diameter. high to soften the stiff balsam, is used. The specimen, thebalsam, the grinding disk, and the spider are placed inside,and allowed to rest until they have reached the temperature THE GRINDING OF MICROSCOPIC SPECIMENS 465 desired. Then working quickly, a sufficient amount ofbalsam is placed on the grinding disk, and the specimenlaid on it. This should be pressed down until it is seenthat all space under it is filled with balsam, but no con-siderable excess should be used. It is well if this restso in the warming box for ten or fiftee
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
