Rhode Island Postal History - 1825 to 1845 18-3/4 cent rate comparison

Postal Stationary - Stamped Envelopes
Rate Comparison Chart of New York Covers traveling a distance of 150 to 400 miles
during the years 1825 to 1845. The correct rate was 18^3/4 cents
Two of the 1835 covers and one 1837 cover were marked incorrectly at 18^1/2cents,
however earlier covers from 1826 and 1828 were marked correctly.
(I believe the Postal employee just made a lazy marking and that the correct rates were charged)

	I included this 1824 Newport Cancel at 18^1/2 x 3 rate for comparison. This cover was sent at the correct rate. of 57^1/2 or 18^1/2 x 3 plus 2 cents Ship Fee. This cover was sent before the rate changed to 18^3/4cents in 1825
	*April 12, 1826 New York Cover sent at the correct rate* of 18^3/4 cents.**
	*April 17, 1828 New York Cover sent at the correct rate* of 18^3/4 cents.**
	*January 16, 1835 New York Cover marked incorrectly* with 18^1/2 cent rate.**
	May 7, 1835 New York Cover marked incorrectly with 18^1/2 cent rate.
	August 31, 1836 New York Cover marked incorrectly with 18^1/2 cent rate.
	New York Cover Sent March 23, 1837 at the Correct Rate of 18^3/4 Cents. Steamboat rate was a 2 cents fee paid to vessels master from the regular rate charge and not added on. (Different penmanship than the other 1837 cover -Most Likely a different Station.)