The ditloid "19 N B by the RS" stands for "19 New Books by the Royal Society." Ditloids are a form of word puzzle where numbers represent words or phrases, often using initials. In this case, "N" stands for "New," "B" for "Books," and "RS" refers to the "Royal Society."
4 bushels in a rood
3 Point Basket
1000000000db is million dollar baby
49 Balls in the Lottery (UK)
Blackbirds Baked in a Pie. Should really be 4 and 20!
It might be "Fifty For A Bullseye" (in darts).
1 Born Every Minute
1756 Birth of Wolfgang Amadeus Mozart
b b b
8 Pints of Blood in Average Adult
The ditloid 7 equals B for S B (7 = B for S B) means:7 = Brides for Seven Brothers
122 spaces in a Chinese checker board