[r-t] Bobs-only 720 Plain Bob Minor

[Philip Earis]

Me:
"It was first described in Clavis Campanalogia (1788), I think, with a 720 by John Holt with three extra bobs affecting the treble. Does someone have the composition to hand?"

OK, a quick google search brings up the e-book of Shipway's 1816 Campanalogia, which can be freely downloaded at:

<https://books.google.co.in/books/download/The_Campanalogia_Or_Universal_Instructor.pdf?id=Wwk3AQAAMAAJ&output=pdf&sig=ACfU3U32wDyQ-cSP06KxNSe2hYSi5GSGGQ>

The relevant text around page 20 is:

==
The last, which I shall present to the practitioner, is one of those singular and particularly interesting productions of the late celebrated Mr. Holt: it contains twenty-one bobs only, being produced without a single; and, in pricking, it will be found necessary, occasionally, to use the treble.

(Comp inserted here - q-sets 6,2 6,3 6,4 bobbed, with three additional bobs affecting 1,2,3 and thus changing the length of the lead)

I shall here offer a few observations on this celebrated production, by way of explanation, and, at the same time, exhort the practitioner to bestow the most attentive consideration, as an intimate knowledge of it will be found greatly to facilitate his acquaintance with that most mysterious part of the science, namely, bells being in and out of course. The knowledge and ingenuity of Mr. Holt, are here conspicuously displayed in its production. It has been already observed, that, in this peal, each two changes are alternately in and out of course, and that it falls to the treble to have both hand and backstroke of its lead in course : it must, therefore, be impossible to have (by the regular mode of pricking changes), more. than half of them without turning the course of the bells, by means of a single, whereby the. changes of the treble on lead become both out of course. Now, by this singular contrivance, has Mr. Holt effected it, without a single, by making the treble dodge at a bob, which removes her two changes farther than she otherwise would have been ; in consequence of which, the two changes of her lead become out of course, and continues, until she dodges again behind at the third bob she is concerned with; which puts them in again, being half the peal; the reason for her making the fourth’s place at her second bob, is, that in consequence of the two leads in which she dodges gaining each two changes, so by her making fourth’s place it shortens that lead the four changes again... 
==
(It goes on...)