The variety of door locks is so great that mention can be made only of some of the distinguishing features According to their construction, locks are generally either "tumbler locks" or "cylinder locks", and according to their position on the door are either "rim locks" or "mortise locks". Tumbler locks are the ordinary kind of lock operated by a long key | Fig. 86), and depend upon tumblers or levers which arc raised by the key to an exact position before the bolt can be thrown. Cylinder locks consist of two cylinders, a small cylinder rotating inside of a larger one and only turning when a key of the proper shape and size is inserted. (Fig. 87.) Cylinder locks are not so easy to pick as tumbler locks, and there is less danger of an accidental exchange of keys, so that they are recommended for outside doors or wherever special security is desired. " Rim "and" mortise " locks differ only in the form of the case, rim locks being made to screw on the face of the door (Fig. 88), and mortise locks are let into the edge of the door (Figs. 86 and 87), the inside construction of both being the same. For ordinary house use, a three lever lock with brass or bronze face is good enough, but a cylinder lock may be used to advantage for the outside doors. The latch and lock will generally be found in combination and may be used with a long plate covering both knob and keyhole, or with a separate treatment of the keyhole by means of an "escutcheon". (Fig. 89.)

Fig. 83. Door Framing.

Fig. 83. Door Framing.

Fig. 84. Loose Joint Butt.

Fig. 84. Loose-Joint Butt.

RESIDENCE FOR MR. J. S. HANNAH, LAKE FOREST, ILL.

RESIDENCE FOR MR. J. S. HANNAH, LAKE FOREST, ILL.

Shepley, Rutan & Coolidge, Architects, Chicago, Ill. The Staircase is Made a Prominent Feature on the Exterior. For Second-Story Plan, See Opposite Page; for Exterior, See Page?4.

RESIDENCE FOR MR. J. S. HANNAH, LAKE FOREST, ILL.

RESIDENCE FOR MR. J. S. HANNAH, LAKE FOREST, ILL.

Shepley, Rutan & Coolidge, Architects, Chicago, Ill.

Note the Fact that All Bedrooms, with the Exception of One, Face toward the Lake. Another Advantage of this Plan is that it Affords Good Cross-Ventilation. For First-Story Plan, See Opposite Page; for Exterior, See Page 74.

Whatever treatment of escutcheon plate is adopted, the knobs and spindle will be the same and may be selected of a variety of materials and shapes. The cheapest knobs are of composition and are commonly called "mineral", "jet", or "porcelain" knobs. Wood finished in natural color is used to some extent, and glass as well. All of these are sold with bronze shanks and escutcheons. A better class of knob, and perhaps the most satisfactory of any, is the brass or bronze metal, either wrought or cast and finished in a variety of shapes and with a wide choice of finish.

Fig. 85. Loose Pin Butt.

Fig. 85. Loose-Pin Butt.

Fig. 86. Tumbler Lock.

Fig. 86. Tumbler Lock.