25. No deed, document or writing binds the institute unless it is signed by the chairman or the director general or, to such extent as the institute may determine by by-law, by a member of the staff of the institute.
The institute may, by by-law, upon the conditions and on the documents it determines, allow a signature to be affixed by means of an automatic device or allow a facsimile of the signature to be engraved, lithographed or printed. However, the facsimile has the same force as the signature itself only if the document is countersigned by a person authorized by a by-law of the institute.