Cyclopedia of architecture, carpentry, and building : a general reference work . Fig. 20. Heavy Bronze Fig. 21. Common Type of Spiral Spring for Doors. Double=Acting Butts. The function of the double-acting buttis to allow the door to swing to both sides of the jamb. It is neces-sarily of the spring-butt type, above mentioned, but is double and is soset as to leave the door shut when at rest. There are no cheap typesof this butt on the market, and the work required makes the bestmechanism necessary. There are no appliances which can be sub- 326 HARDWARE 15

---

Size: 3273px × 763px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bo, bookcentury1900, booksubjectarchitecture, booksubjectbuilding