﻿CONTEXTS. t> 



Department Bulletin No. 1135.- — Spinning Tests or Cotton Com-* 



pressed to Different Densities: • -« page 



Purpose of tests I 



Kinds of bales 2 



Conditions of the tests 



Varieties of cotton tested ,. 3 



Waste determinations 1 



Mechanical conditions 4 



Moisture conditions 4 



Breaking strength and sizing of yarns 4 



Irregularity of yarns 5 



Spinning tests of Cleveland Big Boll cotton of fifteen-sixteenths-imli 



staple 5 



Percentage of waste 5 



Moisture conditions 6 



Breaking strength of 3 T arns 7 



Irregularity of yarns 7 



Manufacturing properties 



Summary of tests 



Spinning tests of Rowden cotton of 1-inch staple 8 



Percentage of waste 8 



Moisture conditions r 9 



Breaking strength of yarns 10 



Irregularity of yarns 11 



Manufacturing properties 12 



Summary of tests 12 



Spinning tests of Delta cotton of lf-inch staple 12 



Percentage of waste 12 



Moisture conditions 13 



Breaking strength of yarns 13 



Irregularity of yarns 14 



Manufacturing properties 15 



Summary of tests i 15 



Spinning tests of Webber 49 cotton of IJ-inch staple 15 



Percentage of waste ^ 15 



Moisture conditions ' 16 



Breaking strength of yarns . 17 



Irregularity of yarns 17 



Manufacturing properties 18 



Summary of tests 18 



Conclusions 18 



Department Bulletin No. 1136. — Kiln Drying Handbook: 



Purpose 1 



Moisture in wood 1 



General principles of drying wood ! ± 5 



Heat in the kiln 6 



Humidity in the kiln 14 



Air circulation in the kiln 20 



Drying and drying stresses 23 



Drying schedules 31 



Kiln types 45 



Piling lumber for kiln drying _: 53 



Details of kiln operation 56 



Air seasoning 63 



Department Bulletin No. 1137. — Symptoms of Wheat Rosette Com- 

 pared with Those Produced by Certain Insects: 



Introduction 1 



Symptoms of wheat rosette 2 



Symptoms produced by the Hessian fly 4 



Comparison between the symptoms of wheat rosette and those caused 



by the Hessian fly 5 



Symptoms produced by the wheat strawworm 6 



Comparison between the symptoms of wheat rosette and those caused 



by the wheat strawworm 6 



Symptoms caused by the wheat stem maggot 7 



