142. Table XX. - Of The Resistance To Compression Of Logs Of White Riga And Red Dantzic Fir, Each 20 Feet Long, The Ends Cut Square, And The Axis Horizontal

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This section is from the book "Elementary Principles Carpentry", by Thomas Tredgold. Also available from Amazon: Elementary Principles Of Carpentry.

Scantling in inches: -		Riga	135	x	13.0	at one end,	12.8	x	13.0	at other	end, and	13.0	x	13.0	in the middle.
,,	,,	Dantzic	13'5	x	13.0	,,	13.5	x	13.2	,,	,,	13.5	x	13.2	,,

(From experiments made by Mr. Kirkaldy for H. Carr, Esq., 1866.)

Description.	20,000 lbs.	40,000 lbs.	60,000 lbs.	80,000 lbs.	100,000 lbs.	120,000 lbs.	140,000 lbs.	150,000 lbs.	160,000 lbs.	180,000 lbs.	200,000 lbs.	220,000 lbs.	240,000 lbs.	250,000 lbs.	260,000 lbs.	230,000 lbs.	290,000 lbs.	300,000 lbs.	310,000 lbs.	320,000 lbs.	330,000 lbs.	Ultimate stress or breaking weight.
White Riga.	in.	in.	in.	in.	in.	id.	in.	in.	in.	in.	in.	in.	in.	in.	in.	in.	in.	in.	in.	in.	in.	lbs.
Compression ...............	.032	.083	.122	.158	.194	.225	.258	.273	.292	.324	.358	.388	.420	.434	.455	.492	.508	.523	.540	.565	.642	331,260
Set.................................	..	..	..	..	.010	...	..	.014	..	..	.016	..	..	..	..	..	..	.022
Deflection, horizontal.......	..	..	..	..	.34	..	..	.41	..	...	.47	..	..	.53	..	..	..	.64
" vertical..........	..	..	..	..	0	..	..	0	..	..	0	..	...	0	..	..	..	0
Red Dantzic.
Compression .. ..	035	088	.133	.170	.203	.232	.263	.276	.292	.318	.346	.370	.400	.414	.440	.488	.507	.548	..	..	..	309,120
Set................................	..	..	..	..	..	..	..	..	..	..	.02	..	..	..	..	..	..	.033
Dflection, horizonta........	..	..	..	..	.08	..	..	..	..	..	.19	..	..	.25	..	..	..	.47
" vertical...........	..	..	..	..	.10	..	..	...	..	..	.22	..	..	..	..	..	..	.55

Note. - The Riga log gave way at knots 2 ft. 9 in. from middle, and the Red Dantzic at knots 0 in. from middle; the specimens were not very dry.

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