Elementary course in woodwork ; designed for use in high and technical schools, with one hundred and thirty-four illustrations, by George Alexander Ross . post; second, the easingat the bottom of thestairs; third, the straightpiece of railing; fourth,the return or twist at thetop. Fig. 126 shows theworking drawing for thenewel post, the explana-tion of which will be un-necessary. The easing isthe bend inthe rail be-fore it strikes the newelpost. The method of lay-ing out a graceful easingis shown in Fig. straight piece of railis worked out with thehollow and the roundplanes whi
Elementary course in woodwork ; designed for use in high and technical schools, with one hundred and thirty-four illustrations, by George Alexander Ross . post; second, the easingat the bottom of thestairs; third, the straightpiece of railing; fourth,the return or twist at thetop. Fig. 126 shows theworking drawing for thenewel post, the explana-tion of which will be un-necessary. The easing isthe bend inthe rail be-fore it strikes the newelpost. The method of lay-ing out a graceful easingis shown in Fig. straight piece of railis worked out with thehollow and the roundplanes which are to befound in the tool room. The return or twist re-quires to be developed by descriptive geometry, and to do this we will refer todrawing Fig. 121 in order to find the diameter of thewell. It will be noticed that one half of the twist isparallel with the landing and that the curve for thathalf would be a true quarter circle, while the other halfof the twist, that part which follows the incline of thestairs, would be part of an ellipse. To demonstrate this, take a cylinder and cut it at an 108 ELEMENTARY COURSE IN Fig. 127 angle to its axis; the section through which the cylin-der was cut would be an ellipse, an illustration of which is shown by Fig. develop this part of theellipse lay out, on a board,by the following method,a full sized drawing of therail required. On the board draw astraight line which will bethe center line of the well,and on any 28, point placing the leg of thecompass (which will be setat the required radius), de-scribe a semi-circle, whichwill represent the diameterof the well given in the planin Fig. 121. Now from thesemi-circle draw lines par-allel to the center line, which will represent the out-side stringer of the stair and the casing on the 129 shows the development thus far.
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