1868.] Practical Carpentry and Joinery. 249 beneath the porch, the cellar sash will be placed behind the guards ; but in cases where there is none, the sash will be omitted, and the porch finished with the guards alone. The posts forming the supports of the porch are generally constructed of two- inch plank, well jointed together, with the joints first well coated with white lead, to check the moisture from pene- trating. This coating should be given in all cases where joints are exposed to the action of the weather ; and all wood- work similarly exposed should have at least four coats of paint on the surface. Porches of the description we have exhibited can now be constructed at a comparatively trifling cost, owing to the advantages of the late improved ma- chinery for planing, and sawing scroll- work, more particularly where such is available on or near the spot. Indeed, there is no reason why — with the facili- ties which now exist in transportation, by rail or other conveyance, between every part of our country, however- dis- tant or retired — such a simple and easy mode of embellishing, and, at the same time, increasing the comfort of our dwell- ings, should not be introduced through- out the length and breadth of the land. A Pair of Front Doors for A Double Dwelling. THIS plate shows the details, on an enlarged scale, of a pair of front doors for a double dwelling. A shows the foundation for the steps. B shows the cellar wall. C shows the panel of the door jamb. D is a section through the pediment over the doors. E shows the wall above. F is an enlarged drawing, showing the stone hand-rail and perforated balus- trade. G is enlarged plan and elevation of newel. H is enlarged drawing of the cap of the columns. I is section of architrave over front door. J is enlarged drawing of cornice. K is enlarged drawing of dividing or centre ornament of pediment. L is section of front-door panel. Construction of a French Roof. E here propose describing the method of constructing a " Man- sard," or what is usually termed, a French Roof. The introduction of this kind of roof into our domestic style of architecture is of so very recent a date, that very many of our mechanics have not, as yet, become familiar with the practical mode of constructing it. We have, therefore, thought that a detailed ac- count of the simplest form — and that which is in general use — might prove acceptable to many of our readers. There are quite a number of different ways in which this particular style of roof is formed, increasing in complica- tion proportionally to the massiveness and costliness of the buildings for which they are designed ; but these we do not intend taking up in the present number. We shall reserve them for a future occa- sion ; and confine ourselves to that only, which, being the most simple, can be readily comprehended by every one. This plate represents a design for a concave curved roof, intended for an ordinary dwelling-house, or building. It is shown in section, exhibiting all the timbers in their places ; one half present- ing the interior, and the other half the exterior, looking at the naked timbers, including the joists of the attic floor, and the connection of the roof timbers therewith. It also includes a section through the cornice, showing the pro- file of the supporting brackets, and the face of one. We will now proceed to describe the various timbers, their pur- poses, and the mode of connecting them, which will appear in regular order, as follows : A is the exterior wall of the building,
