The transcript of this letter is:
June 19. 1889
I shall be glad to inspect your collection a little later on. Just now I am exceedingly busy with machines for the Paris Exhibition.
I have much matter concerning androids.
Yours very truly
H. Evanion Esq.
Maskelyne’s letter is to Henry Evanion, a major collector of paper ephemera, including much relating to magicians. For information on Evanion see Early English Conjuring Collectors: James Savren and Henry Evanion by James Hagy, Second Edition published in 2020 by Reginald Scot Books, Glenview, USA.
Some of the 1890-1891 Egyptian Hall programmes for the Maskelyne and Cooke shows include an advertisement for Maskelyne’s Mechanical Cashier & Book-Keeper on the back page. The example illustrated here is from Ref. no. N2012. According to the advertisement it ‘Beat all competitors at the Paris Exhibition, receiving the highest award given for cash registering apparatus’. The illustration includes the words ‘Silver Medal, Paris 1889’. It is likely that Maskelyne’s letter to Evanion refers to the work needed to prepare these machines for the Exhibition.
The curator of this website is currently trying to confirm that Maskelyne really did win the Silver Medal. This is necessary because J.N. Maskelyne’s claims cannot always be taken at face value. A search by the National Library of France confirmed that M. Maskelyne of Manchester did submit a cash register (details here) but was unable to find information relating to the medals awarded.