<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                         140,472
<SECURITIES>                                      9250
<RECEIVABLES>                                   32,262
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               181,984
<PP&E>                                         433,616
<DEPRECIATION>                                 221,362
<TOTAL-ASSETS>                                 485,282
<CURRENT-LIABILITIES>                           12,604
<BONDS>                                              0
<COMMON>                                        57,914
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     497,413
<TOTAL-LIABILITY-AND-EQUITY>                   485,282
<SALES>                                         87,469
<TOTAL-REVENUES>                               110,156
<CGS>                                                0
<TOTAL-COSTS>                                   78,004
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 32,152
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             32,152
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    32,152
<EPS-PRIMARY>                                      .06
<EPS-DILUTED>                                      .06