One Vertical Space Division
Upon analyzing one vertical space division, it will be found to be a primary mass, vertical in character and governed by Rule 1a. [Figure 25], [Plate 12], illustrates one vertical division. The foot is an appendage to be considered in [Chapter V].
Rule 3a. If the primary mass is divided into two vertical divisions, the divisions should be equal in area and similar in form. Exception may be made in case of structural requirements. By imagining two adjacent doors of equal size, the design effect of two vertical divisions may be made clear. [Plate 11] illustrates a rectangle (A) divided in this manner, preliminary to the development of a problem. [Figure 27], [Plate 12], represents the type of object to which the exception to the rule may be applied. In the design of this desk, the structure practically prohibits two equal vertical divisions, necessitating an unequal division in the section occupied by the drawers.
Two Vertical Space Divisions
In [Plate 12], [Figure 26], the designer had his vertical spacings dictated by service in the form of two doors. As service demands a tall vertical primary mass, it is but natural to design the doors to conform with the primary mass. This gives a monotonously long space for the glass panels and suggests structural weakness. To relieve this the designer applied Rule 2a and crossed the vertical panels by horizontal subdivisions, relieving the monotony and still retaining the unity of the primary mass.
Two Vertical Divisions in Wood
In [Figure 27] his problem was a variation of that presented in [Figure 26]. Structural limitations called for unequal divisions of the vertical space arrangement. The left portion of the desk becomes dominant as demanded by service. The drawer or brace is necessary in this design as it acts as a sort of link, binding the two vertical legs together. The omission of the drawer would destroy the unity of the mass.
Plate 13