MARIE
24
U.S.PUSTAGE
Ore Boat at Lower Level in the MacArthur Lock
SAULT STE. MARIE, MICHIGAN
overcome the
The purpose of the Locks is to
approximately 20-foot difference in level between
Lake Superior on the west and Lake Huron on the
southeast. Ships in the Locks are raised or low-
ered by the principles of gravity and water seek
ing its own level.
July 16,57
Hi-Low Friends.
que just took a boat.
ride three the locks up the
St. Mary's River, where thes
big cargo ships like this
one calies iron ore 20-
to 25,000 tons in one cargo.
It is the businest canal
on the world. Couldn't
find a card of the boat
That
P13267
ENTE
L 16
30PM
1957
URPICTURE PUBLISHERS, INC., Boston 15, Mass., U.S.A.
we were on. It would
take about rov paskangers oriva.
Hiawatha Co., Box 56, Ypsilanti, Mich.
Bumard+H.
Mr & Mrs Franeis Morton
16 Mildred St.
So. Portland,
maine.
