WINTER VOLUME 44 * NUMBER 1 2008 THEATRE DESIGN & TECHNOLOGY on the Cover ◗ Illustration by Julie Delton. 10 MEASURING COEFFICIENTS OF FRICTION FOR MATERIALS COMMONLY USED IN THEATRE by Verda Beth Martell, Eric C. Martell, Brendan Bernacki, and Robert Mentzer To accurately calculate drive force (and eventually power) for a motor-driven system, you need to know all of the other forces in the system, including the frictional force. 25 41 54 17 SEEING WITH THREE EYES: DESIGNING FOR DIFFERENT MEDIA by Holly Poe Durbin The medium affects not only the design parameters, but also the kinds of stories we tell. 25 FORT WORTH FOR ENTERTAINMENT: BILLY ROSE'S CASA MAÑANA (1936-1939) by Annie O. Cleveland and M. Barret Cleveland The ﬂamboyant Broadway producer, Billy Rose, helps Fort Worth outdo Dallas's celebration of Texas's centennial. The Subtext Book Reviews Inside USITT Advertisers 9 41 MASK MAKERS IN NIGERIA INSPIRED BY YORUBA TRADITIONS by Deborah Bell As they beckon and cajole òrìsà spirits to life, Nigerian mask makers resist the inﬂuences of contemporary culture. 58 68 54 HOUSTON THEATRES PULL TOGETHER AFTER FLOOD 72 by Janet L. Harreld Massive ﬂooding caused by hurricane Allison in 2001 tested the skill and perseverance of the performance companies located in Houston's downtown Arts District.