e have long ago men- It will be remembered that, in treating upon the spur tioned the property which wood has of altering its size ac- wheel, we had, in forming the box for shaping the teeth, sim- cording to the dryness or humidity of the atmosphere, which ply to draw out on each end the natural… … point, but yet are so near that we cannot shift the compasses, even if they are furnished with a slow-motion screw, with- out making the error greater. Tlie usual way of overcom- bounding the teeth must converge to the point, X ; so if we ing this difficulty is to give the compass points a few…
Patents · Improved · Bevel · Water · Iron · Blue glass · Jaws · Hair spring · Blake machine · Scientific American · Perforated thin · Wire gauze · Wrought iron · Bevel wheel · Revolving shaft · Upper jaws
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