Multi-extent touches of Plain Bob Doubles

240s

The easiest way to call a 240 is to call one 120 inside another;

Letís say weíre calling the 5th unaffected:
PPPBPPPBPPPB
But after the first two bobs, weíll switch to calling a 120 with the 3rd unaffected: this happens to be PBPPPBPPPBPP.
So, inserting it, we get:
PPPBPPPB PBPPPBPPPBPP PPPB (6 calls)

The inserted 120 is true in itself, but not not begin or end in rounds; rounds can appear at any lead during it. The thing to beware of is underlined: you will always get a whole course without any calls - so donít be tempted to call the last of the 5thís unaffected calls too early, or you get a 200.
And equally well, you can end up with 2 bobs in a row:
e.g. inserting BPPPBPPPBPPP into BPPPBPPPBPPP might give:
B BPPPBPPPBPPP PPPBPPPBPPP (6 calls)

i.e. call 4th unaffected, then call the 5th unaffected 3 times, then (after a Ďplainí course) call the other two of the 4thís unaffecteds. Note that here you get rounds at the second lead! And you get 6 plains in a row later on.

This also makes an excellent way of repairing mistakes (see also RW 1999, page 1238).
e.g. suppose that we were calling the 2nd unaffected:
PBPPPBPPPBPP
But we miss the second call (or it seems unwise to call it, as someone is going wrong at that point!)
So we call it the next lead instead:
PBPPPPB
The 4th is unaffected at this call, so we need to call the 4th unaffected twice more, before going back to do the 2ndís remaining two calls unaffected:
PBPPP PBPPPBPPPBPPBPPP BPP (6 calls)

Note here, though, that seeing as we called the Ďplainí course at the start of the insertion, we donít have to wait at all at the end, before calling the 2nd unaffected again.

So the rule is:
Call any bell unaffected 3 times, inside another 120 - but remember to let a whole course go without calls, either at the beginning or end of the insertion.

Of course, the same scheme can extend to any degree of nesting, to make 360s, 480s...

A different kind of 240 can be obtained as follows, without the need for a whole course without calls:
For instance, call PBPBPPBP three times (9 calls); the 5th is the "semi-observation" bell, that is, it does the same work in each part, so it is easiest to call from there.

The only way to get a 240 containing each change once at handstroke and once at backstroke is to call a touch using both Bobs and Singles. One such touch (from the Ringing World 1995 - No. 4402, p. 930) is:
PBPBPSPSPBPS, repeated.

360s

These have the advantage of not containing whole courses without calls.
But, again, the simplest ones donít really have to be learned as such, but made up as you go along.

e.g. let us say that you are ringing the 5th, and have just called the 2nd unaffected:
PBPPPBPPPBPP
But, instead of the last plain, where it would come round, call a bob, with yourself unaffected.
This has the same effect as calling yourself unaffected at the end of a plain course, so we can just repeat the whole lot three times. (i.e. a 120 with a bob at the end).
PBPPPBPPPBPB PBPPPBPPPBPB PBPPPBPPPBPB (12 calls)

In fact, you can call whoever you like unaffected in each of the 120ís - in the example shown, the 2nd was unaffected in the first one, then the 4th, then the 3rd. In this case, the 5th did the same in each 120: Out, 4ths, In, Unaffected.
Again, you might get 2 calls in a row:
PPBPPPBPPPBB PPBPPPBPPPBB PPBPPPBPPPBB (12 calls)
Or, even, 3 calls in a row: e.g. calling the 2nd unaffected in each 120:
PBPPPBPPPBPB PPBPPPBPPPBB BPPPBPPPBPPB (12 calls)

Another 360, can be constructed somewhat differently. It is based on the first one above, but calling additional bobs whenever the 5 is unaffected. Note though that you never get 120 consecutive changes that are true within their own block, but that each change occurs 3 times somewhere in the 360 as a whole.
PBPPBBBPPBPB, three times (18 calls)

It is always quite easy to call these from the 4th, as he is unaffected at the first lead of each course, so you call yourself unaffected at the start of each 120, rather than the end:
BPPBPPPBPPPB, three times (18 calls)

You have to be a bit more careful from the 2nd or 3rd, to call the right bell unaffected for the first or last 120, to avoid getting a 400, where the extra course is partly at the beginning of the touch and partly at the end.

As with the 240s above, more complex 360s can also be obtained from specific compositions. In each of the following examples, the 5th is the semi-observation bell:
PPBPPBPPPBPB three times (12 calls),
PBPPBPPBPPBB three times (15 calls),
PBBPBBPBBPBP three times (21 calls),
PBBPBBPBBBBB three times (27 calls!).

720s

Revd J. Morgan composed some 720s, containing each change three times at handstroke and three times at backstroke, using a cube to symbolise the movement between courses. One such was given in the Ringing World in 1996 (o. 4432, p. 365), along with others by A. R. Price.

PPPB PPB PB PPPB PPPB PB PPPB P, twice repeated
(Call 5th - Home, In, 3 Homes, Out, 4ths in each part)
Or, to avoid a run of four plains:
PPPB PPB PB PPPB PPPB PB PPPB B, twice repeated
(Call 5th - Home, In, 3 Homes, Out, 4ths, Home in each part)

PB PPPB PPPB PB PPB PPPB PPPB P, twice repeated
(Call 5th - Out, 4ths, In, Home, In, Out, 4ths in each part)

PB PB PPPB PPPB PB PPPB PB PPPB, twice repeated
(Call 5th - Out, In, Out, 4ths, 4ths, In, Home, Home in each part)