actice he will be able to make fine work, such as the tern, of core cups having tapering holes, so that the pat- achromatic objectives of microscopes and telescopes, eye- pieces, lantern objectives, etc. terns can be removed without disturbing the bolt hole cores or dies. The lower parts of the… … disk attached to or formed upon the end of a bar, and used ject of this invention is to increase the surface of attraction as a scraper for giving the final shape to the concave grind- between the armature and the poles of the magnet, and thus Pig. 10-LENS GRINDING ATTACHMENT FOB FOOT augment the…
Patented · Patents · Color · Center · Consists · Scientific American · Salmon trout · Prussian blue · Sewing machine · Wood working · Send stamp · Steam boiler · York belting · Brook trout · Patent issued
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