. Scientific American Volume 92 Number 11 (March 1905). ough the opening leading to the surface. Ithas been sought to overcome this difficulty by enlarg-ing the bore of the hole at the bottom where the ex-plosion takes place, so as to afford a relatively re-stricted outlet, which conduces to a more complete in-closure of the gases generated. The accompanyingengraving illustrates a reamer, which may be attachedto the ordinary drill for thus enlarging the hole. Thedevice consists of two cutting blades or bits pivotallymounted in a frame, which is provided with a socketfor the reception of the en
. Scientific American Volume 92 Number 11 (March 1905). ough the opening leading to the surface. Ithas been sought to overcome this difficulty by enlarg-ing the bore of the hole at the bottom where the ex-plosion takes place, so as to afford a relatively re-stricted outlet, which conduces to a more complete in-closure of the gases generated. The accompanyingengraving illustrates a reamer, which may be attachedto the ordinary drill for thus enlarging the hole. Thedevice consists of two cutting blades or bits pivotallymounted in a frame, which is provided with a socketfor the reception of the end of the drill, to which it issecured by screws. The bits are of approximately tri-angular shape, terminating i:i sharp points at theirouter extremities. In practice a hole is first drilledwith a common drill. These drills are usually formedwith oppositely-disposed separated points, which forma conical base or nipple at the bottom of the the reamer is applied to the drill, the bits press-ing against the conical base are forced outward, so. REAMER FOR ENLARGING BLAST HOLES. that in their rotation they will form an enlargedchamber, as indicated in the illustration. When thechamber has been reamed out to a sufficient depth, thedrill and reamer may be readily withdrawn, for thebits will return to their normal folded position. C. Bramer, of Cheswick, Penn., is the inventorof this novel reamer. March 18, 1905. Scientific American 229 RECENTLY PATENTED Interest to Farmers. RAKE-TOOTH CLIP.—L. L. Ladtnee and Jones, Traverse City, Mich. In the presentpatent the invention relates to improvementsin clips or caps for securing the teeth to theangle-head of a horse hay-rake, the object beingto provide a clip or cap with which either aright or left hand tooth may be engaged—thatis, a tooth having its end turned either to theright or to the left. The clip of these inven-tors may be used at both sides of the center. GLEANING ATTACHMENT FOE THRESH-ING
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthotwater, bookyear190
