The island was reopened in December 2001, after airport-type metal detectors were installed to screen visitors before they board the ferry for the island from lower Manhattan.
32.
Antimony ( Sb ) melts at 630 �C . This highly crystalline metalloid, gives type metal its hardness and a much better and sharper cast from the matrix.
33.
Its alloys include pewter ( a tin alloy with up to 20 % antimony ) and type metal ( a lead alloy with up to 25 % antimony ).
34.
Despite patiently trying different proportions of both metals, solving the second part of the type metal problem proved very difficult without the addition of yet a third metal, antimony.
35.
Then this matrix would be held in the lower part of the mould, the upper part would close on it, and molten type metal would be poured into the cavity.
36.
Both scenarios, if not stopped by these safety features, usually result in a squirt of molten type metal, encasing the matrices and the elevator in metal in the process.
37.
The mold disk is sometimes water-cooled, and often air-cooled with a blower, to carry away the heat of the molten type metal and allow the cast slugs to solidify quickly.
38.
Currently, used types are semiconductor charge-coupled devices ( CCD ) or active pixel sensors in complementary metal oxide semiconductor ( CMOS ) or N-type metal-oxide-semiconductor ( NMOS, Live MOS ) technologies.
39.
When the line is justified, the matrices fit tightly between the vise jaws, forming a tight seal which will prevent the molten type metal from escaping when the line is cast.
40.
Although there was a large body of research and literature generated on molecular wire-type metal complexes through the mid-1980s, interest in stacked metal-metal bonds saw a decline until only very recently.
