982 THE GARDENERS’ CHRONICLE AND AGRICULTURAL GAZETTE. [Novumesr 3, 1860, 
up by the nut at its upper end, this pressing on the pla 
SOME AT" a okies Of ik pect ae aa 
a nn eae 
TaT the 6th of | abcd, show in Ppt iot two. halves of the trussed beam 
; Ribot half is termed a flitch ; ; ef g hshowsa side a slaration of 
June, ne, and the seed sown “the same day after the | one “fitch * 5 it, end elevation of the two flitches. A central 
y 
manure was covered in by the final closing of da stud K is placed between the two flitches, and brought tight | groove the iron rod n pee gegen being led u 
drills. All the experimental plots brairded equally ; wants 
well; and there was an even crop throughout the ea le 
entire season on the oe ire experimental ground. el he, Ks 
The erop was saved on the 9th December er, and the n y or ie Toe | m C 
result is shown in the illowig table : tax hi ro it : A 
cwt: u d p 
— eee = MER tons, cwt. d Py r 
1. Peruvian Guano tr .. 4 6 a 20 14 à 
S Phosyhe Peruvian .. ae a 19 19 -e 
3. Ritchie’ e Bone ee 6 ie 18 § 
4. Odams’s Blood Man 3 1s 3 
5. Law es's Superphosphate ave 17 13 s 
6. Dublin M Manure Co. on Tha 1y 5 mia : j d ù k fi 
7. e-made Bone Manure .. 7 0 17 «4 
8. Kooria N ge aane.. a a = ; 
9. Pa Tie @ 
These manures are all so well known t that any | ds oi bear a pressure nearly three times as great as a single beara 
and passed through iron > Bats s bearing on the eni g ot 
reference to their composition is Mates emt rape shown at pin ie foe ‘elevation Sa obvi sec aroa! by mich he Shue is equal to the two “‘flitches” placed 
er secu 
The result, however, though not contrary to | pots ong ita as at er tees are as thus trussed will | Pig. 80 illustrates a trussed beam in whi seo Tn 
what might have been expected on a 80) uP i 
is in favo jan guano, and is b 
(uch as ota Peruvian, OpAms’s Blood Manure, | 
&e.) which contain a large E paee E of ee ar 
a (say 2 to 4 
per cent. ). 
J Experienos ha has; shown that very different ana 
f the 
iow manures, It is, therefore, p, Boe r hey 
ow the co onditi ofs il an are employed, In entral stud, a, is used, the head b 
cs abel ahs so ae or which bane Steam’ ait on ets go of beam ‘oy the nut¢ The 
Fail abet shown that when land ridin ce a a T sa sonst N SN EONS 
large quantity of org sr matter capable of pro- 
g ammonia, a ye aS atic guano would, in all 
i gee ae more Poison tinea than the more | 
0. 
t their lower ends, ¢ e, in the studs, ff, w! hich are 
sect by bolts, g g. Ron bolts, hh, are poria back of 
studs, f f to keep them in their place, when p. essed upon by 
on the al a pe s the soil, prove the most - Fic. SE i 
economical of all artificial manures. And, again A i » Onthisa 
on sls in medium condition a mixture of Peruvian | Sanad fn Se Bb Ms da m tp Een pae eg ebony, ht D R 
and superphosphate see: the two flitches together. m aee GPE r ; f- 
the same pa tot ng, hem es erat? to oe la tig. 21 shows a method of trussing a beam on the “queen- jea ane ipee ieee e of employing a wrought-iron pd 
the heaviest crop at the lowest cost, Wi i 
occasional exceptions (and in such cases there 
perfections riage “incidental to the mode 
of conducting the inquiry) our experiments have 
fully borne out this vi w of the case; and we may 
the same is suppa y concurrent testi- 
mony. The experiment under review leans in the 
same direction. The ground at ia oad n was, 
ooria guano via 
, Which, as regards the percentage of 
ammonia, may be regarded as intermediate between 
eruvian guan s, has n 
Fie. 
ti many istri of the | istaran, as in fig. 29; pa ap a pomak over the two studs, 
be, popa peene by utat tho Fi nds, in manner pem in fig. 
proporti t e at in figs. 29, an 
ies combine oe _in excellent rr limi me the ity, i giv jou te fig. 29. The Teeth of the ‘beam between 
two leading” constituents ag 
the price were rediit 1, eh 2, 
<o per ton mta „a still more formidable 
5 eruyian guano, - 
32. 
supports of fig. 29 is 20 feet: of figs. 30 and 31, 25 feet.. 
pa a aot perai us t B noe the full length, we we 
broken e length, as in the drawing, 4 
In adopting the form of trussed beam with “strats” s 
a 
TLL, 
WITT 
sank d 
opinion as roe papi) vë osph 
over ambigndace? manures for the growth of Terni: ie ee fig. 
i, ¢ fig. 31, one should be taken to make the bearing in fig. 29, a method o! the n the rod is shown in fe o ‘ 
face. asab, fig. 32, against which k end of strut c d Paata, The rod fg, g f, fig. 31, into two lengths, fora iD ; 
IRON AND TIMBER. to be at right angles to the direction in which the strutpresses, me phen being finished as shown at a a, fig. 33, the see sacks a 
asacorbd. In fig, 32, which is i scale of one-fourth the in the same figuro, screwed to, and lefte 
poen following paper is in continuation of two or three previous. | bolt d, ‘ame endse f of which are with right Sond 
amunications from Mr. Mes agar on Building Materials, hand serews. J passes ough a nut po 
which sppeareq at page 342, &e.} ing . By ing the screw fd by the head apie 
omposite Beams.—A. few notes and illustrations on SENS parts corresponding to a a are brought tegethe y é 
the use of beams of wood in which iron is employed for Ni ogee by having «aiteo SS 
a t-iro between them, jet one ore 
In many cases ee cannot be asiy obtained of suf- NG NG 4 koinata the beams b ¢, the ari of the iro- 
ficient scantling to ie rt a given weight with a SI ther by the bolts dd and nuts ¢¢ Im Pi {ho sides 
te NG sides throughout its length, 6 fo whi 
certain span. In this case the operation of trussing may |, USS ly curv sketch, The scale to 
at y ed as in the . 
be resorted to a “great advantage. As the strength i his drawing is made is Finch to the foot. tion shown iD 
a beam may creased — old by its adoption, } > imensions of a cast-iron beam Oina to bear & 
where wioaght oats is used, ts position s sh ould be so ight CA be aro ed peir j 
arranged that the pressure it h a 34, a foot, are as slows 15 inche 
tension, or tbat force which hasa tendeney ya full si iato. plate is tightened up against the | depth of girder 15 inches, width of lower flange Hir wor 
draw asunder the fibri res of the iron. Fig, 29 illustrates lower ro of eg hon by the 20 pai gh shows the plan, i being noe of upper flange mn, 44 inches; thickness + thick 
Aceh : placed. 2, inches; at the edges 12 rib at l 
a trussed beàm in which a a wrought roll, 3-inch | * et ed e in w! TUT green strut ¢ : dis fg. $1, > of iis Ghee t part, 24 ea Of warions F: 
x here a wrought-iron truss em jna asin as ate oi linch; t eams j 
; diameter, is employed, | at fg, gJ, the rod passing ov wer studs at the points. g g, as at i ‘Bop 1 isch. ae ki: E 
bottom, 13; at top, 1 ns of 
