ddle, and their inner ends the stave are jointed revolve in a plane coincident with ject glass sixteen inches in diameter ; the one at Cam- slotted to grasp the pins, j andj. Thus, it will be the axis of the swinging frame, thus cutting the edges bridge being fifteen inches. of the stave always… … In grinding the lens, the first amusement. A very large propor- step is to make a cast iron bed of tion of the business of the firm of the properform. This is done by Holtzapfell & Son, one of whom avery simple process. A rod, of was the author of the celebrated the length of the radius…
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