| Description | [406] With the following enclosure and annexed copy: Letter. William Johnson (Patent Office & Designs Registry, Lincoln’s Inn Fields) to James Watt & Co. (—). 15 Jul. 1851. “Wants drawings of the 700 horse engines exhibited by us at the Great Exhibition. Sends number of the Practical Mechanics’ Journal.” [Johnson is editor.] Letter (transcript). James Watt & Co. (Soho) to William Johnson (Lincoln’s Inn Fields). 17 Jul. 1851. |