668 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1914. 
Now, let us look at the block in the drawing of the front elevation 
(fig. 49) and then at a drawing showing the block in detail, separately. 
The lever for raising the block, being extended to a convenient 
length, is connected bya rope to a treadle worked by the weaver’s 
foot in the hand loom, or by any ordinary mechanical arrangement 
in the power loom. 
Figure 52 gives us details of the block (1) as seen in front eleva- 
tion; (2) from above; and (3) from the end. 
The block, the lever, and the arrangements for sliding up and 
down are already explained. But hanging from the block is a kind 
of gridiron, called by the weaver a “ griffe,’ which requires careful 
notice. . Near each end of the block a flat plate of iron is firmly fixed. 
The shape of the plate is shown at No. 3, and between the plates, 
eight bars of hoop iron are fitted, as at No. 2.. These bars are placed 
diagonally (see No. 3) 
and their top edges are 
sharpened so as to fit 
under the carefully made 
small hooks at the top 
ends of the upright wires 
as they stand in their sev- 
eral rows. 
The first section of fig- 
ure 50 shows the block at 
its lowest position, with 
the hooks caught on the 
bars of the griffe. Should the block now be raised the whole of 
the 400 hooks will be drawn up and the whole warp will rise with 
them. When released, of course, all will fall together, pulled down 
by the lead weights. Again, if the projecting ends of the needles 
are pushed inward, the needle eyes will deflect the hooks and remove 
them from the griffe, which will then, if the block be raised, rise by 
itself, leaving the hooks, leashes, and warp all down, as in section 2. 
Tn section 2 the points of the needles are seen to pass through and 
project beyond the surface of an accurately perforated board fixed 
to the front of the machine frame opposite the needles. Hung in the 
frame, hinged to the top of the machine, is a four-sided revolving 
bar, or cylinder, each side being perforated so as to match exactly 
the perforations of the needle board. 
If the flap, with the cylinder in it, be pressed against the board, 
and the block raised, nothing different will happen, because the points 
of the needles will have been free to enter the holes in the cylinder. 
If, however, a card covering all the holes be fixed to one side of the 
cylinder and the cylinder then be brought close up, presenting each 
side in regular succession, every time the card comes in contact with 
Fic. 52.—Details of the block of a Jacquard machine. 
