eir last previous appear- the lathe. The drill is indicated at E, and ance was in 1888, approximately two sun spot the guide at F. Pig. 2 shows the guide in periods earlier. In 1907 the woodwork of the perspective, and also in plan. It will be ob- Diagram showing drill for cuttin Section through… … Details of tbe guide members. A is clamped to the supporting arm of the machine. By a German patented process, soluble starch is pro- The drill so far described will cut square holes with duced by acting upon a mixture of starch and acetic adjacent to the rounded edge of the shank. The arc rounded…
Patents · Device · Apparatus · Adapted · Machine · Hot water · Scientific American · Square foot · Receiving surface · Square holes · Power house · Sheet metal · Sun spot · Practical treatise · Producer gas
Internet Archive · Public domain (published before 1931). Free to use for anything.
