The type of window shown at E {Fig. 93) is

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Fig. toy now quite frequently used in this country, both with and without the mullion. It differs from the ordinary transom window in having only one sash below the transom, thereby necessitating an entirely different construction of the frame. Such windows, to be of practical utility, should be constructed so that the lower sash will slide up a distance equal to its height, or nearly so, and the transom should be accessible for cleaning the outside of the sash.

Two quite different methods of construction are shown in Figs. 102 and 103, both of which have the same appearance from the outside. Both frames are constructed with boxes at the side for weights, as in an ordinary box frame, and the lower sash in both is operated exactly as in a double hung window, except that a pocket is required above the yoke to permit the sash to slide up the full height of the lower opening. This pocket is formed by extending the pulley stiles and weight boxes the full height, and covering them front and back with matched boarding, the yoke being cut in between the pulley stiles. Over the opening in the yoke a board, S, is fitted, which is pushed up by the sash and drops again as the sash is lowered. This board is called the "follower."

In the arrangement of the upper sash, the two details shown differ widely. In the window shown in Fig. 102 the upper sash is constructed like any transom sash, and the inside of the transom is finished by a shallow panel, the panel moulds being cut between the parting strips. If the lower sash is not more than 4 feet high, and the transom has but a 4-inch reveal, the transom sash may be stationary, as the glass can be cleaned by standing on the sill and reaching above the transom. If the lower opening is more than 4 feet high, or the transom has an 8-inch reveal, then the transom sash should be hinged so that it can be opened, the best way of doing this being to make the outside casing wider, as shown by the dotted lines, and the sash an inch narrower, so that it will swing in by the parting strips, the sash being hinged at the bottom. In the drawing the transom sash is shown stationary. The author has used this construction with very satisfactory results.

The construction shown in Fig. 103 is very frequently used, and appears to be a very practical solution of the problem. This construction is the same as that of an ordinary double-hung window, with a head pocket, except that a transom is placed in front of the upper sash and the lower portion of the upper sash has a wood panel.. By this arrangement both sashes slide up and down in the usual way, and the outside transom is merely for appearance, without the constructive functions of a transom.

The back of the stone transom is covered by a panel, with about 1/16 of an inch space between the panel and the outer sash. The only objections that the author can see to this construction is that ice might possibly form between, the transom panel and the upper sash, and the difficulty of cleaning the glass in the upper sash, for when the sash is lowered so as to reach over it, the bottom of the glass would be behind the transom and inaccessible, although it might perhaps be reached from below. When the glass must be cleaned from the in-side, the construction shown in Fig. 102, with the transom sash hung, would appear to be the most desirable. The dotted lines back of the transom show how a box transom may be built inside ; it is very doubtful if this extra finish would add to the appearance, and it increases th difficulty of cleaning the glass.

Fig. 104 shows the elevation of window similar to that shown at 1

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Fig. 105.

Fig 93, but with the upper lights divided by a wood mullion. This window is one of several used in the first story of the Odd Fellows' Temple, Philadelphia, Messrs. Hazlehurst & Huckel, architects. The lower tight being very wide, gives a fine view from the inside and a good appearance from the outside. The construction of the window is shown in Fig. 105, the lower sash sliding up into a pocket above the head, and the transom sash being fixed. It will be seen that the general construction is very similar to that shown in Fig. 102, the principal difference being that the transom is all of wood and the parts of the frame are heavier.