. The microscopic anatomy of the human body in health and disease (Volume 2). Fig. 6. To cut glass satisfactorily by this method, it is necessary to use a dia-mond having a true point, or one that will cut in any direction. Most ofthe writing diamonds sold, will cut but in one direction. Mr. Quekett has described an instrument devised for the purpose of cut-ting thin circular covers. A much simpler instrument, however, is repre-sented in Fig. 7: PRESERVATION OF OBJECTS. 53. Fig. 7. It usually forms one of the instruments furnished in a mathematical instru-ment case, and can be readily procured
. The microscopic anatomy of the human body in health and disease (Volume 2). Fig. 6. To cut glass satisfactorily by this method, it is necessary to use a dia-mond having a true point, or one that will cut in any direction. Most ofthe writing diamonds sold, will cut but in one direction. Mr. Quekett has described an instrument devised for the purpose of cut-ting thin circular covers. A much simpler instrument, however, is repre-sented in Fig. 7: PRESERVATION OF OBJECTS. 53. Fig. 7. It usually forms one of the instruments furnished in a mathematical instru-ment case, and can be readily procured at any store where such instrumentsare sold : It consists of two arms united by a cradle joint; one arm pointed,like the arm of a pair of ordinary dividers. The other arm is about one-half the length, having a circular opening, divided perpendicularly in thecentre. The two sides of this circle are made to approach and separate bymeans of a small adjusting-screw. The original design of the instrument,is to draw circles on paper, by means of a lead pencil fastened in the circu-lar opening by the screw. In cutting glass, the writing diamond is substi-tuted for the lead pencil, and after the cutting-point of the diamond is turnedin the proper direction, the diamond-holder is to be secured at the properdistance by means of the screw: as the steel arm of the instrument usuallyterminates in a sharp point, this must be removed, and a blunt point may rest on a sma
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