DC10-30 ACFT. CAPT RPTR FAILED TO SEE #2 WINDOW NOT CLOSED COMPLETELY ON PREFLT. ON TKOF ROLL NOTICED IT AND REJECTED THE TKOF.

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WE COMPLETED OUR PREFLT AND TAXI DUTIES AND WERE CLRED ONTO RWY 21C. METRO TWR CLRED US FOR TKOF. I ADVANCED THE THRUST LEVERS AND IMMEDIATELY BECAME AWARE THAT MY #2 WINDOW WAS NOT FULLY CLOSED. I RETARDED THE THRUST LEVERS AND CLRED THE RWY; SECURED THE WINDOW AND COMPLETED THE TRIP WITHOUT FURTHER INCIDENT. THE NEXT OBVIOUS QUESTION IS HOW DID I MISS THIS DURING PREFLT? A COUPLE OF THINGS COME TO MIND. I DO REMEMBER LOOKING AT THE WINDOW DURING MY PREFLT FLOW AND NOTING THAT THE WINDOW LOOKED CLOSED; BUT; WHAT I WAS LOOKING AT WAS THE WINDOW FRAME. IT LOOKED CLOSED. WHAT I SHOULD HAVE BEEN LOOKING AT WAS THE OVER-CTR LOCK. OUR COMPANY FLIES 2 VERSIONS OF THE DC10 A -30 AND -40 MODEL. I GENERALLY FLY THE -40 MODEL. THERE ARE SIGNIFICANT DIFFERENCES IN THE COCKPIT LAYOUTS AND PREFLT PROCS BTWN THE 2 MODELS. THE INS ON THE -30 IS SIGNIFICANTLY MORE COMPLICATED THAN THE -40 AND TAKES MORE TIME TO PROGRAM. BECAUSE OF MY LACK OF EXPERIENCE ON THE -30 THERE IS MORE PRESSURE TO ACCOMPLISH THE PREFLT WITHIN THE ALLOWED OR SHOULD I SAY ALLOTTED TIME. I CAN SAY I WAS A LITTLE RUSHED TO ACCOMPLISH MY TASKS. ANOTHER CONTRIBUTING FACTOR IS THAT THE WINDOW FRAME ON THE 2 MODELS IS DIFFERENT. WHEN I LOOKED AT THE -30 FRAME AGAIN IT STILL LOOKED CLOSED. I TRIED THE SAME THING WITH A -40 AND IT LOOKED OPEN. ANOTHER FACTOR; FATIGUE. I HAD A POOR NIGHT'S SLEEP THE NIGHT BEFORE AND I FEEL THAT MAY HAVE CONTRIBUTED TO THE PROB. I DON'T THINK THIS WILL EVER HAPPEN AGAIN TO ME BECAUSE ON ALL FUTURE PREFLTS I WILL GO THROUGH THE MOTIONS OF OPENING AND SECURING THE WINDOW MYSELF.