Builder's hardware; a manual for architects, builders and house furnishers . y by the piece A. B is brought over thehook on the lower sash merely in order to draw the meeting-rails more closely together. The Byam sash-fast, Figure 208, is a very simple deviceacting entirely by gravity, the central bent lever being socounterbalanced that the lower arm will always project overthe lower sash. The section will show how this lever ishung. VII. Sash-fasts which loch in different positions. Thedifficulty with all sash-fasts of this description is that, of neces-sity, they operate on one side ofthe wi
Builder's hardware; a manual for architects, builders and house furnishers . y by the piece A. B is brought over thehook on the lower sash merely in order to draw the meeting-rails more closely together. The Byam sash-fast, Figure 208, is a very simple deviceacting entirely by gravity, the central bent lever being socounterbalanced that the lower arm will always project overthe lower sash. The section will show how this lever ishung. VII. Sash-fasts which loch in different positions. Thedifficulty with all sash-fasts of this description is that, of neces-sity, they operate on one side ofthe window, instead of in the cen-tre of the meeting-rail, and that,consequently, every attemptto open the window when it islocked, wrenches the sash so asto, in time, make it loose in thejoints. Also, with nearly allthe forms, the mechanism isconcealed, so that the sashes areliable to many unnecessarywrenches. The advantages arethat the window can be leftpartly open and still be securedfrom intrusion, and that, in mostcases, either sash can be lockedindependently of the Fig. 209. & Sons. J. B. Figure 209 illustrates a veryprimitive appliance, consistingsimply of a ratchet rail, with a spring-catch on the bottomsash. Figure 210 shows a more complete form, which is mor-tised into the face of the hanging-style, the levers working into SASH-FASTENINGS. 137 holes in each sash. The sashes are fitted with other holes onthe edges, at intervals, so that they can be locked at variousheights. In the cut the section shows more clearly the working. A single spring, coiled about each lever, serves to throwthem both out. Pushing up the knob on the inside bead drawsback the upper lever, releasing the upper sash. Pushing theknob down releases in the same manner the lower sash. Chapter VIII.
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