U2 



JOUKNAL OP THE DEPARTMENT OP AGRICULTURE. 



1(1 the square vaid, liiul tor larger trees at least 9 ounces. Good 

 (juality so-called " lO-oz." duck is suitable for tlie smaller trees, 

 and "8-oz." or " Ij-oz." or heavier duck for the larger ones. By a 

 good (juality duck is meant one thi'ough which few direct rays of 

 light are seen to penetrate when it is held to the sun. Formerly good 

 ((uality IVo. 10 (luck, weighing OA'er 15 ounces to the square yard, 



Kk;. S. — ■iS-foot Fuiniijutlun Sheet. — Sketch to show liuw 72-iii'-h cloth i.s cut and 

 the length of the various pieces. The four full-length middle strips, 48 feet 

 long, are first cut ; then a right angle (A), 2 feet on the straight sides, is 

 cut from each outside corner of Nos. I and 4, thus leaving these pieces 44 

 feet long on their outside edges ; next No. 5 is cut with its long side 

 matching the short side of No. 4. The piece "x" is cut away on the bias 

 with one inch of the full width left on it so that as "xx" it may l)c joined 

 on to the last width to be cut. The inch is allowance for the seam. The 

 other end of No. 5 is cut on the bias from the roll of cloth, the proper slant 

 being easily secured by doubling the cloth on itself to the right angle. The 

 roll is then turned over to start No. 6, which is finished on the bias as was 

 No. 5. Nos. 7 and 8 are similarly cut except that the roll of cloth is cut 

 straight across from the end of the short side of No. 8, and this width com- 

 pleted with the mitre "x" taken from No. 5. Sheets of other sizes are cut 

 similarly, the length of a side being made to approximate five-twelfths of 

 the diameter. Thus each of the eight sides of a 72- foot sheet should measure 

 close to 30 feet. The small circles near the ends of the sheet in the sketch 

 mark the approximate position for "catch places." The heavy lines and 

 small figures show how the sheet is marked for showing the distance over 

 a covered tree ; commonly, however, the marking is done lengthwise only 

 and the work further reduced by having one row of figures, placed midway 

 between the lines, serve in place of the two rows. 



was Used for all sizes of co\er.s in South Africa, but the cost of this 

 cloth makes it practically prohibitive at present. Twenty years ago 

 it cost only about (.ne-tourth of Ayliat a duck two-thirds as heavy does 

 now. Practically all duck used in South Africa for fumigation covers 

 is 72 inches wide ; but for many purposes duck cloth is made 28i to 

 •^0 inches wide, and it is ordinarily designated by its weight, e.g. 



