Brarg.—On the Building Materials of Otago. 179 
TABLE IV. 
WEIGHT AND STRENGTH OF Otago Timpers, WITH EwcLrsH AND FonkroN 
XAMPLES. 
o tb 
a 
Sas j B e 
s58 8| $] £ 
Popular Name.| Botanical Name. nici "d g p a Remarks. 
+ 
a BH 3 5 
posi @ RIPE 
o 
at: 
OTAGO TIMBERS. Ww S E T 
Black Mapau | Pittosporwm tenuifolium |60'14 | 243 2152 |114'08 
Red Mapau ...| Myrsine urvillei ... ...| 61°82 | 19204 | 169:88| 92°94 
White AA Carpodetus serratus .| 51°24 | 177°6 | 166°86 | 54°64 
Manuka .| Leptospe icoides | 59°00 | 239 239°5 | 116°58 
Rata .| Metrosideros luci ...|65'13 | 196 2442 | 9423 
erg - EE 'phora y ds e: “i $e "m ei 2s 
o a ..| Elo ocarpus tatus ...|85' L "T 7°65 
Libocedrus bidwillii — ...9909 | 120 | 1367 | 3243 | Presult Gf ous the 
9|Miro ..  ..|-Podocarp inea ...|49:07 | 197-2 | 23024 | 12805 riche bac e 
10 | Totara ...| Podocarpus totara ..]3517 | 138°6 | 124°6 | 5885 P y. 
11 | Black Pine ...| Podocarpus FM ain ata ...| 40°74 | 190 156°22 | 90°86 
12 | White Pine ... (orden rydioides |3043 | 106 1 49'07 
18|RedPine  .. ve Ir eie 8925 | 140°2 | 143 79°66 
14 | Silver Birch... Pu mons .]838:99 | 1582 | 116 62:04 
15 | Red Birch  ... Fagus fus ...| 48°62 5 87:28 
ENGLISH AND FOREIGN EXAMPLES. 
16 | Australian Iron Bark ... es set ..|70:92 | 98277 | 297 19231 
1 n ue y <. z+. 60°66. | 2148 | 2596 | 191778 
18 | English Oak -— c i i ...| 55°96 | 128:5 | 127 105:36 pes ias to Barlow. 
5 js : xu Ses 51°72 | 1764 | 2578 | 150'79 Laslett. 
»,. Ash 46°19 | 1692 | 180 11596 y: Barlow. 
ay » «e at s M A 88'5 | 33L'6 | 133°90 A Laslett. 
92 | Memel Deal PT es xo es ...| 86°77 | 14425, 116 as Š Barlow. 
28 | English Beech ... — ..  ..  ..  ..|4337| 12966 195'8 | 134°58 y £ 
24 | Riga Fir... he dx s is "46 89:9 TA 79 95 » 
25 cade ss m Sex T aa 83°81. | 181°2 | 435°4 | 221-76 s Laslett. 
26 | English Elm ax e ves tee ae 9 74°63 us Barlow. 
27 z 1 ou a es Ee. 4515| 99-51 5 Laslett. 
98 | Kauri So ee DNE 94:81 | 15742 41746 898:86 4 
29 “4 .]88:96 | 1655 | 18127 | 92:98 $ Balfour. 
NOTES ON TABLE IV. 
The “strength” given in column S is the weight in pounds required to break pieces 
twelve inches long and one inch square supported at one end and loaded at the other. 
“ Elasticity" is the greatest weight in pounds carried with unimpaired elasticity, 
divided by the deflection caused by it in inches, the specimen being the same size and 
loaded as a 
3: See ” is the breaking Selah given in column § divided by the deflection 
caused by it in inches at the instant of rupture. By this method the lowest tabular 
number indicates the greatest toughness. 
LE.—To find the breaking weight of a beam from the table, multiply See) 
ide times the breadth of the beam in inches, the square of its depth in inches, and t 
tabular number S, the result divided by the distance between the supports in feet gives 
the breaking weight in pounds distributed over the entire length of the beam. 
Example.—A kowhai beam twelve feet long between the supports, twelve inches 
deep and six inches broad, will break with 53 tons 7 ewts. 16 Ibs., thus— 
BXOX 18 x 12x 207 119,50 1bs.—53 tons 7 cwts. 16 Ibs. 
. When the load is confined to the centre, the beam breaks with half this weight. 
