The Philippine journal of science. [Vol. 67, no. 1]

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The Philippine Journal of Science

the purpose. The descriptions of the apparatus used and the
description of the tunnel itself, together with the necessary accessories and connections, are given in detail and with photographs. The results of pressure measurements made at different points of the models are given in graphical form. The
various shapes subjected to air current consist of plane surfaces
and solids. Circular discs varying in diameter from 50 to 70
cm and rectangles and triangles of various dimensions were
used. Among the solids used were spheres varying in diameter
from 50 to 100 cm, cylinders of from 6 to 40 cm diameter,
and prisms, pyramids, cones, and cubes of different dimensions.
In the second book are contained studies on models of partly
open buildings and of buildings without any walls, and screens
with and without perforations which were subjected not only
to air current produced in the wind tunnel but also to natural
wind. The authors made stream-field measurements in addition
to pressure measurements. Photographic records of stream
lines around the models are given. An Appendix giving the
mathematical treatment of the results of the investigations upon
stream fields surrounding buildings is included.
With the exception of this mathematical appendix, the books
can be easily understood by average readers.-C. A. O.