When auto-changing turntables were commonplace, records were typically pressed with a raised (or ridged) outer edge and a raised label area, allowing records to be stacked onto each other without the delicate grooves coming into contact, reducing the risk of damage. Auto-changers included a mechanism to support a stack of several records above the turntable itself, dropping them one at a time onto the active turntable to be played in order. Many longer sound recordings, such as complete operas, were interleaved across several 10-inch or 12-inch discs for use with auto-changing mechanisms, so that the first disk of a three-disk recording would carry sides 1 and 6 of the program, while the second disk would carry sides 2 and 5, and the third, sides 3 and 4, allowing sides 1, 2, and 3 to be played automatically; then the whole stack reversed to play sides 4, 5, and 6.
দীর্ঘ রেকর্ডিং, যেমন অপেরায় পাওয়া যায়, স্বয়ংক্রিয় পরিবর্তনকারী সিস্টেমের সাথে ব্যবহারের জন্য তৈরি করা হয়?
interleaved across several 10-inch or 12-inch discs for use with auto-changing mechanisms