. A textbook on mechanical and electrical engineering . the two precedingcases, the student may complete the views without furtherinstruction. In this case, the projection of a separate fullview may be omitted, the latter being shown in the sideelevation. PROBLEM 31 80. To project sectional vicAvs of a scalene cone. Explanation.—This solid, whii:li is of varied form andof frequent occurrence in the metal trades, is an irregulargeometrical figure. It is a cone whose axis is inclined to itscircular base. All the elements of a regular cone are of equallength, Init the elements of a scalene cone a
. A textbook on mechanical and electrical engineering . the two precedingcases, the student may complete the views without furtherinstruction. In this case, the projection of a separate fullview may be omitted, the latter being shown in the sideelevation. PROBLEM 31 80. To project sectional vicAvs of a scalene cone. Explanation.—This solid, whii:li is of varied form andof frequent occurrence in the metal trades, is an irregulargeometrical figure. It is a cone whose axis is inclined to itscircular base. All the elements of a regular cone are of equallength, Init the elements of a scalene cone are necessarilyof variable length, for, since its axis is inclined towards aportion of the base, the elements in that part of the surfacemust be shorter. It is to be noted in this case that the axisof the cone shown in Fig. 45 does not pass through thecenter of the circle that represents the base of the solid. Construction.—To reproduce this drawing on the plate,draw first the horizontal line ba in the plan 3§ inches 86 PRACTICAL PROJECTION § 15. long, as called for by the dimension figures in Fig. 45; next. describe the circle boc2i inches in diameterfrom a center locatedon the line ba, its circum-ference passing throughthe point b. Project theelevation according tothe dimensions given inFig. 45. The axial line isnext drawn; bisect theangle B A C and draw thebisector A 0\ representthe cutting plane w ;; bya line drawn perpendicularto A O and cutting A Cf inch from C. The method of projec-tion for the various viewsof this solid is the sameis, divide the outline of theconvenient number of spaces(12 in this problem), and from points thus located drawthe elements to the apex a (see plate). Next, projectthese elements to the elevation and finalh project theirintersections with the cutting plane to the different views, asshown in the drawings on the plate. Note that the fullview of the section, which in this problem is taken at rightangles to the axis of the solid, is an ellips
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmechani, bookyear1902