4 Abed may be made from a prepared board that is packed with balsa wood strips of varying
size and thickness to support the panel over its entire surface during cradle removal. While the
cradle is being removed, it will need to be adjusted continually if the curvature alters.
5 Buttons, also known as cleats, are the rectangular reinforcing blocks frequently glued over
the back of the panel to repair cracks. While they are generally cut into the surface, they may
be left “proud.”
6 Butterflies are the bow-tie or butterfly-shaped repair blocks often cut into the back of the
panel to reinforce cracks, splits, and joins.
7 The modulus of elasticity is constant for a particular material. It is the force above which the
panel will deform or be damaged and not return to its original condition by elastic behavior.
8 To damp the movement of the panel is to reduce the amplitude of the cycles.
9 The moment is the product of the force and the distance from its point of action.
10 Plastazote foam is a closed-cell, cross-linked polyethylene foam (see Materials and Suppliers).
11 In the United Kingdom, 55% RH is generally considered the best average humidity in which to
keep panel paintings.
12 In the United Kingdom, aircraft release notes identify timber that is tested to Civil Aviation
Authority standards, for consistency of density, quality, and moisture content.
13 Slits made by a saw blade.
14 British Standard 1088 signifies “marine quality,” indicating that the stability and quality ofcon-
struction are assured by testing. It is not the same as waterproof plywood (WPB), which is
produced to a lower standard.Plastazote foam (REF LD 24),BXL Plastics, Mitcham Road, Croydon, Surrey CR9 3AL, U.K.
(distributed by Hemisphere Rubber Co., 65 Fairview Road, Norbury, London SW16 5PX, U.K.).
Teflon PTFE,CHR Industries, 407 East Street, New Haven, CT 06509. European supplier: Furon
CHR Products, P.O. Box 124, 7640 AC Wierden, Netherlands. United Kingdom distributor:
Polypenco, now part of DSM Engineering Plastic Products UK, 83 Bridge Road East, Welwyn
Garden City, Hertfordshire AL7 1LA, U.K. (The PTFE tape is marketed as Temp-r-tape HM series.)Materials and Suppliers
A F U A S 381