A newer type of sash lock is that illustrated in Figs. 75 and 76. In Fig. 75 is shown a sash lock known as the _Fitch_. This lock is made by several manufacturers, and can be procured in all finishes of iron for the cheaper class of buildings, and also in bronze metal for high-class work. It is composed of a helical cam, which is fastened to the top of the meeting rail of the lower sash and engages with a hook, or lug, that is secured to the bottom of the upper sash. The operation of this fastener is rapid, and the rotary movement draws the two sashes together horizontally and forces them in opposite directions vertically. In this way, it holds the sash fast and prevents rattling and air leaks. It also has an advantage in that it cannot be moved by inserting a knife blade between the sashes from the outside. The _Yale screw sash fast_ illustrated in Fig. 76 is an excellent piece of hardware. It accomplishes the same results as the Fitch lock; namely, drawing the sash together by the tightening of a thumb nut on a fine-pitched screw. This nut operates against a semicircular-shaped upright hook, or lug, on the lower sash, thus developing great pressure in the desired direction. While this sash fastener takes somewhat longer to operate than the Fitch, it repays by providing greater security. =66. Sash Lifts.=—While =sash lifts= are not required for the cheapest work, as the window can be raised by pushing against the parting rail or against the mullions, nevertheless they are made to sell at such reasonable prices that it would seem advisable to place them on the lower sash of all buildings, no matter how unimportant. [Illustration: FIG. 77] [Illustration: FIG. 78] [Illustration: FIG. 79] The common type of sash lift illustrated in Fig. 77 is known as the _hook sash lift_. This lift is extensively used, and can be procured in any grade or weight, in either cast-iron, steel, or bronze metal, and in any finish desired. The _flush sash lift_, the general type of which is shown in Fig. 78, makes a better appearance than the hook lift, and is considerably stronger, from the fact that the casing forming the grip is let into the lower rail of the sash, and the strain is taken by this, rather than by the screws. These lifts are made in either steel or bronze, and in all finishes; they can also be had ornamented to correspond with the lock trim. For heavy sashes, such as those in public and commercial buildings, the _bar sash lift_ illustrated in Fig. 79 is the best. This type of lift should always be used for heavy sash. A sash lift similar to the type shown at (_a_) is sometimes fastened to the under side of the meeting rail of the upper sash for the purpose of lowering the sash. [Illustration: FIG. 80] [Illustration: FIG. 81]