122 Regent Street
July 21: 1826 –

Sir

At the great pressure required for the condensed air blowpipe, the stopcocks always leak a little; and upon trial I found that the pressure in your box considerably decreased in three or four hours: I have therefore thought it advisable to send you the Oxygen gas (about 600 cubic inches), in a caoutchouc bag, from whence you may easily transfer it to the copper box, as the small stopcock connects with a female screw you will find in the large stopcocks you have, by which it can be adapted to the syringe; or you can use the gas direct from caoutchouc bag if you please; your further commands will oblige

for John Newman, ^<1> Sir Your humble Servant
Elliott^<1>

H.F. Talbot Esq^r
Richmondhill

[address panel:]
H.F. Talbot Esq^r
Richmond Hill

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Notes:

1. John Frederick Newman 1773-1840), instrument maker at 122 Regent Street, London. In early 1846, Nicolaas Henneman transferred his photographic operations from Reading to this address.

1.Charles Elliott had just apprenticed to John Newman, .