<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 2,692,492 <SECURITIES> 0 <RECEIVABLES> 153,689 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 2,846,181 <PP&E> 4,040,735 <DEPRECIATION> 3,330,596 <TOTAL-ASSETS> 3,556,320 <CURRENT-LIABILITIES> 113,003 <BONDS> 291,294 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 3,152,023 <TOTAL-LIABILITY-AND-EQUITY> 3,556,320 <SALES> 0 <TOTAL-REVENUES> 625,180 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 234,790 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 14,428 <INCOME-PRETAX> 375,962 <INCOME-TAX> 0 <INCOME-CONTINUING> 375,962 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 375,962 <EPS-PRIMARY> 0 <EPS-DILUTED> 0