Miriam Bulwar David-Hay found her relative Sender KRYSKA in a
1908 Belgian police file of foreigners who had to register,
with an address of 93 Pietstreet in New York City. There's
no Pietstreet in New York City, she thinks it's Pitt Street,
but she was unable to locate anybody with the right surnames
there in the 1940 Census.
I think she has the right street. Pitt Street is in the heart
of the Lower East Side, and though there are barely any Jews
around Pitt Street nowadays, the area was teeming with Jewish
immigrants around the turn of the century. She should definitely
look at that address in the 1910 U.S. census, using the Steve
Morse tools to determine the Enumeration District for that year.
Even if she can't find him at that address, the name Sender KRYSKA
or its variants (Alexander for the first name, Kriska and others
for the surname), is unusual enough to look for without restricting
it to a specific address in the census, and also to look in various
naturalization databases, in case he returned to the U.S. >from
Belgium and became a citizen. The 1905 New York state census may
also be worth a look.
New York, N.Y.