Patent ID: 8578889

Claim:
A specimen support, comprising: a longitudinally-extending elongated bed having a front portion, a rear portion, a top portion and a bottom portion; a head clamp, adjustable about said front portion of said bed for engaging a specimen's head, said head clamp comprising an exhaust passage; a ported block provided on said front portion of said bed below said head clamp, said ported block comprising: an intake port defining a gas flowpath from said bottom portion to said top portion of said bed wherein said intake port is in fluid communication with said head clamp exhaust passage, and an exhaust port defining a gas flowpath from said head clamp exhaust passage at said top portion of said bed to said bottom portion of said bed; wherein said head clamp is movable on said front portion of said bed for aligning said head clamp exhaust passage with said intake port and said exhaust port; a gas delivery line extending from said rear portion of said bed to said intake port; and a gas exhaust line extending from said exhaust port to said rear portion of said bed.