Letter from The French Electric Pearls Co, Electrical Engineers & Contractors, 353 Oxford Street, London, to [Robert Harrison] Assistant Secretary, Royal Society, Burlington House Acknowledges Harrison's feedback on the Aspirator, noting that while a single application may not entirely remove dust from heavy, long-laid carpets, consistent use should achieve this. Expresses regret for a warped panel, attributing it to possible exposure to heat sources, and assures that a replacement panel will be sent shortly. The sender, hoping it to be a satisfactory solution. 17 February 1908