1Isaac McPherson to Thomas Jefferson, 2 January 1814 (Jefferson Papers)
Thy esteemed favour of the 3 rd of September came safe to hand and I have the great satisfaction in saying that I have procured such testimony respecting the origin of the different parts of the machenery that O Evan’s claims as his invention that I think every honest man must say when he peruses it that he has most grossly imposed upon the public and it may have its use. I have had 500...
2Thomas Jefferson to Isaac McPherson, 18 September 1813 (Jefferson Papers)
I thank you for the communication of mr Jonathan Ellicot’s letter in your’s of Aug. 28. and the information it conveys. with respect to mine of Aug. 13. I do not know that it contains any thing but what any man of Mathematical reading may learn from the same sources. however if it can be used for the promotion of right, I consent to such an use of it. your enquiry as to the date of Martin’s...
3Isaac McPherson to Thomas Jefferson, 28 August 1813 (Jefferson Papers)
I duly reciev’d thy verry able letter of the 13 th In s , and have greatly to regret that the public had not been possessd of the views thou hast there taken of the subject, before the late trial of O Evans v s Sam l Robinson in the circuit court at Baltimore —had it been the case, the result of that trial must have terminated the question betwe e
4Thomas Jefferson to Isaac McPherson, 13 August 1813 (Jefferson Papers)
Your letter of Aug. 3. asking information on the subject of mr Oliver Evans’s exclusive right to the use of what he calls his Elevators, Conveyers, and Hopper-boys , has been duly recieved. my wish to see new inventions encouraged, and old ones brought again into useful notice, has made me regret the circumstances which have followed the expiration of his first patent. I did not expect the...
5Isaac McPherson to Thomas Jefferson, 3 August 1813 (Jefferson Papers)
In the year 1790 or thereabout I presented to thee letters of recommendation from George Mason , Ralph Wormley , & Henry Lee Esq re on business. From thy attention to me at that time, I take the liberty of now addressing thee without restraint on a subject that I am in no way interested in, more than as far as respects the good of my country at large, and if I am correctly informed thou hast...