Fig. 165 shows how to tenon a moulded sash bar to the rebated cross rail. In this illustration both shoulders of the moulded bar are shown square, but in the best class work these shoulders may be slightly housed into the cross rail to prevent side play. This type of joint is used for horticultural buildings, etc. If the lower rail be moulded with the same members as the sash bar, the end of the sash bar will have to be scribed on to it to make a fit.

Fig. 165. - Tenoning Moulded Sash Bar.

Fig. 166. - Tenon with Tongued and Grooved Shoulder.

Tenon with Tongued and Grooved Shoulders ( Fig. 166 ). - The object of the tongues and grooves here is to prevent the face of the work casting, or becoming warped, and thus spoiling the appearance of the surface of the work. If framing is to be veneered on the face side this is an exceptionally good method.