31 showing a later stage in use of the fig. 30 apparatus.
fig. 33 is a view similar to fig. 32 showing a stall later stage in use of the fig. 30 apparatus.
fig. 34 is a view similar to another portion of fig. 31 showing a stage in use of the fig. 30 apparatus comparable to the stage shown in fig. 33.
fig. 35 is a view similar to fig. 34 showing an even later stage in use of the fig. 30 apparatus.
fig. 36 is a view similar to fig. 35 showing a still later stage in use of the fig. 30 apparatus.
fig. 37 is a view similar to fig. 36 showing 