Letter from Fred B Sellar, A E Dent and Company, Process Engravers, 7 Broadway, Ludgate Hill, to Sir W Herschel [William James Herschel], Warfield Rectory, Bracknell, Berkshire Having received an order from J A Hardcastle to photograph three portraits and a telescope sketch, they wish to arrange a time. Two alternative days would be best, to select a bright day, and Sellar presumes that any glazing may be removed from the pictures. 8 January 1912