Report ..., Volumes 9-17

Front Cover
U.S. Government Printing Office, 1929
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Contents

Defects produced in lumber by air seasoning
48
Period required for adequate airdrying of lumber
54
Airdrying of smalldimension stock
67
Sorting of mill product for drying in progressive kilns
73
Compartment kilns for sawmill kilndrying
80
Piling of lumber for kilndrying
93
Operation of compartment kilns
100
Making moisturecontent tests
106
Final steaming of kilndried stock
112
Kilndrying in a vacuum
121
Bibliography of lumber seasoning handling and care for the lumber
124
ILLUSTRATIONS
126
Scheme of pile and alley numbering for sawmill yard
1
New longitudinal pile foundations on concrete piers
2
Old foundation contrasted with improved form
3
Two views of foundations on concrete piers
4
Foundations too low and handicapped by weeds
5
A typical foundation bent
6
Short lumber piles on longer stringer foundations
7
Foundation supported on wooden blocks
8
Short hemlock piled on doublelength foundations
9
Doubleranked piling of Red River Lumber Co served by locomotive 3 គ ន ក ងទី១ ទី ១ ទី ៥ ន
10
Short hemlock piled two endlapped lengths to pile
11
Good and poor care of stickers
12
Power lumber piler or elevator
13
Airline piling under monorail
14
Portable horse used in piling unit packages_
15
Sling used for lifting unit packages by cable
16
Straddle lumber tractor
17
Elevated tramcar helps in piling lumber
18
Improved jack for elevating lumber to top of pile_
19
Simple sticker spacing frame
20
Diagram of arrangement of tiers in box piling
21
Yard alleys showing common form of pile roofs
22
Cross section of sidepiled lumber pile
23
Pile shield for end of pile of 3inch cypress
24
Pole stacking for reduction of bluestain damage
25
Samples showing checking and honeycombing
26
Section of oak plank showing severe honeycomb
27
End checking in a cross section of western larch
28
Partly airdried pile of thick oak with severe end check
29
Warped lumber produced by crooked sticker course
30
Drying rate chart for Douglas fir
31
Method of piling railroad ties known as 71 or 81
33
Roundedged lumber piled for airdrying
34
Squares bundled with stickers and wiretied over protecting blocks
35
Conventionalized longitudinal section of progressive kiln
44
Kiln load piled with narrow vertical vents
45
Kiln load piled with liberal vertical air vents
46
41
45
Kiln load mechanically piled of package units
47
Manufacturing practice 28
28
Inspection 34
34
Storage before shipment 41
41
Convenient form of control chart for progressive kilns
48
Conventionalized cross section of compartment kiln
49
Edgestacked kiln load collapsed by shrinkage in kiln
50
Study of two kinds of spacing between boards
51
Use of form for shaping chimney in kiln load
52
Completed load piled with use of tunnel form
53
Kiln load piled with vertical through chimney
54
Kiln load with flared chimney reaching part way
55
Piling frame with sticker spacing racks
56
Kiln load of redwood piled in sticker frame
57
Transfer car equipped with tractor power
58
Method of cutting moisturetest samples
59
Recesses in side of kiln load for holding kiln samples
60
Casehardening samples and what they show
61
Cupping of casehardened southern pine board upon resawing
62
Churt of equilibrium moisture content in wood
63
TABLES
72
1
Estimated consumption of lumber by industries which use small dimen
1
59
59
60
60
61
61
62
62
Foreword
The crew
11
Conclusions
17
Log haulup
2
Leading sizes of rough cuttings and their consumption by nine impor
4
108
34
110
37
118
40
Leading sizes of rough cuttings consumed by the chair industry
6
Leading sizes of rough cuttings consumed by the kitchen cabinet
12
124
17
Elevated wood
33
industry
45
Range of sizes of squares used by the woodturning industry
14

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Page 8 - Board, and the Bureau of Foreign and Domestic Commerce of the Department of Commerce.
Page 1 - ... preservative must displace or compress the air in the wood. After the retort is filled, additional preservative is forced into the cylinder by means of pressure pumps, the pressure being gradually raised to and maintained at 125 to 175 Ib.
Page 40 - US DEPARTMENT OF AGRICULTURE. Forest Service. 1920. Timber depletion and the answer. A summary of the report on timber depletion and related subjects prepared in response to Senate Resolution 311. US Dept.
Page 118 - Manual of Design and Installation of the Forest Service Water-Spray Dry Kiln. By LV Teesdale. Department of Agriculture Bulletin 894, October 18. 1920. Price, 10 cents. A good manual for this type of kiln. The Theory of Drying and its Application to the New Humidity Regulated and Recii-culating Dry Kiln.
Page 10 - DC, works in close cooperation with a number of official and private organizations, notably the Bureau of Standards of the Department of Commerce and the Forest Products Laboratory of the Forest Service, Department of Agriculture.
Page 51 - Commerce, comprises about 200 members representing manufacturers, distributors, and consumers of forest products. Its object Is to work for closer utilization of our country's timber resources. The committee, whose headquarters are in the Department of Commerce. Washington, DC, works in close cooperation with a number of...

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