What was found
SMELL OF SMOKE (PERHAPS ELECTRICAL BURNING). DECLARED EMERGENCY, REJECTED TAKEOFF BELOW 80 KTS. VISIBLE LIGHT SMOKE IN COCKPIT. FA EMERGENCY CALL STATING VISIBLE SMOKE AND BURNING SMELL IN FWD CABIN. EMERGENCY EVAC SLIDES 1L, 2L, AND 2R BLOWN. EVACUATED. ACCOMPLISHED COMP RINSE OF #1 ENGINE. PERFORMED ENGINE RUNS AT 804 904 N2 AND NO FURTHER SMELLS NOTED.