Mr. Colls' question relates to rules for multiplication and division said to be printed on the inner cylinder; George Fuller was unable to answer this, quoting old age (both of himself and his only calculator) as reasons. Colls also states that Stanley were having difficulty mounting the scales accurately, and that he had to return two calculators that were inaccurate. He concludes by suggesting a means for supporting the calculator in use, to save wrist strain. He had hooked the top end into an electric-light bracket, and asked whether some adaptation of this idea could be put into production. Was this the origin of the bracket found on later models?