374 
EXPLANATION OF PLATE3. 
vi'nled a device* for securing the combs not merely straight , but 
of uniform thickness. It will be tested on a large scale, this season 
(18C0), and the results given to the public. In those instances in 
which it has been tried, it has succeeded admirably. 
Gage-Block for fastening the movable frames together. Figs. 6, 
7, and 8, page 24. 
Fig. 6 is a view of the front of this block, Fig. 8 a view of the 
back, and Fig. 7 is a cross-section. 
(a) Foundation board. 21 x 9J" x J". (b b) Guides, for sides 
(u i/), of frames, fastened to (a), equally distant from its ends, and 
so as to leave 17J" between (b A), and i" from upper edge of (a) 
to ends of ( bb ). (c c) Buttons for holding sides of frames (utt), 
against (bb), 61" x ll"xj". (//) Guides in which the top tri- 
angular comb-guide is placed, in order to have the top strip (t) 
nailed thereto; each piece (/) is 21 J" x 2" x i", and they are 
beveled from one edge, back T ^", and are then fastened to (a), 
forming a triangular groove, each side of which is Two tri- 
angular pieces, i" x J" x 5" x 2J", are fastened (Fig. 6) at each 
end of the groove, (g) Guide-strip. J"x^"x 19£, fastened to 
(/) i" from its beveled edge. ( h ) Guide-strip, i"x^"x3j", 
fixed on and across the pieces (f f), J" from their ends. To nail 
the frames together, put the triangular comb-guide (v) in the 
groove formed by the pieces (f f) : place the piece (/) on the top 
of (u), and against the guides (g ) and (A), and nail it to ( u ) with 
two brads each about 2" from the end. Proceed in this way until 
all the triangular guides are nailed to the top strips. Now turn 
over the gage-block and secure the vertical pieces (au) against 
the guides (bb), by the buttons (cc), and nail the bottom (t) to 
(u «), with two brads at each end. Turn the gage- block, and placo 
the top of the frame (t), which has before been nailed to the guide 
• This devlco Is substantially tho same with tho one alludod to on p. 208 ; Mr 
Colvin’s, however, was Invented boforo mine. 
