The problems and quotes again come from Chess Problems: Tasks and Records by Jeremy Morse.
"Thereafter, composers turned to block form, and the following problem is the finest of the many 8-interference problems produced since Harley's."
W. Michalak British Chess Federation Tourney 1960/61 #2
"The collocation of BR-BQ-BB in Michalak's problem (dubbed Harmonium-pipes on the analogy of Loyd's Organ-pipes) helped John Driver in 1965 to produce what was thought to be the first example of 9 interferences, in the following problem."
John E. Driver British Chess Federation Tourney 1965 #2
"It then came to light that as long ago as 1946, H.J. Burgess had published the following problem, achieving 9 interferences, in the Braille Chess Magazine (T.R. Dawson ran a problem section in this magazine from 1935 to 1946, and included the work of a number of blind composers, of whom Burgess was the most successful.)"
H.J. Burgess Braille Chess Magazine 1946 #2
"The discovery led to a flurry of intensive effort, which produced the next three problems." We will look at those problems next week, as we conclude this series on interference records, and the final problem will show the record of 10 interferences. In the meantime, 6 points for sending me a complete variation to each of these three problems, at garykevinware@yahoo.com , by next Wednesday.