484 EXPLANATION OF PLATES. 



of the back, and Fig. 7 is a cross section of the front and 

 back. 



a Foundation board, 2 1|^ by 9^ by 1^. b b Guides for sides 

 (mm), of frames fastened to (a) equally distant from its ends, 

 and so as to leave 17|Lhs between (b b) and -^ of an inch 

 from upper edge of (a) to ends of {b b). c c Buttons for 

 holding sides of frames (u u), against [b b), 6^ by Ig- by -J. 

 Cut in one end of each button, a triangular groove corres- 

 ponding to the shape of the sides of the frames, d d Guides 

 for placing the Winter passage [v), 4 pieces, -j^g- by IJ- by 1^. 

 One end of each piece is cut to a miter, so that when fasten- 

 ed on (a), as shown in Fig 6, two sides of a -|lh square are 

 formed. The upper edge of the upper guides is l^th from 

 top edge of (a), and the lower edge of the lower guides is 

 l^ths from the boilom of (a). //Guides in which the top tri- 

 angular comb-guide is placed, in order to have the lop strip 

 {t) nailed thereto; each piece (/) is 21J- by 2 by J, and 

 they are beveled from one edge back, ^^, and are then fast- 

 ened to (a), forming a triangular groove each side of which 

 is l^ths. Two triangular pieces -^ by |- by -^ by 3 are cut 

 on a miter at one end and fastened, (Fig. 6,) at each end of 

 the groove, g Guide-strip, J by -f^ by 19|-. h Guide-strip 

 i by -f^ by 3^, fixed on and across the pieces (ff) ^ an 

 inch from their ends. To nail the frames together, put the 

 triangular comb-guide (m) in the groove formed by the 

 pieces (ff); place the piece (t) on the lop of (u) and 

 against the guides (g) and (/(), and nail it to (m) wilh two 

 brads each about two inches 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 verti- 

 cal pieces ((( m), against the guides (bb), by the buttons (c c), 

 and nail ihe bottom (t) to {u u) wilh tvvo brads at each end. 

 Turn the gage-block, place the winter passage (d) in the 

 guides (d d), glue the copings and place the top of the frame 

 (t) which has before been nailed to the guide (u), in its 

 proper posiiion, and nail it to (uu) with two brads in each 

 end, and lo the Winter passage (i<) wilh one brad. When 

 the gage-block is turned for the next frame, put a brad 

 through the bottom (l) into the Winter passage (v), before 

 turning the buttons and removing the frame. 



