280 REPORT—1840. 
Box a. No. 1. Class No. 13. Gray Cast Iron. 
l 2, 3. 4, 5. il 
Ex 5 Specific 
SEEE Hot or External Gravity of} 
SEES Commercial Character of Iron, Cold Character of | How Cast.| Specimen 
4eag ee Blast. Fracture. ' s, 
we = — 
RS w 
= Nol? (Calder xckccat ieee. sek Hot |Close bright 
5 ose brig f 
he { +34 No.2. Pentwyn+ 3 Scrap} Hot gray Green 7-168 
dt Nosh i @alder ssc. cessrseck cone Hot |Closebright | 
3 . 
a 79 { + 4No.2. Pentwyn 4 4 Scrap) Hot | gray f Green 7-168 
ING EE. @AIAER 22.005 vc cuss ates Hot |Closebright 
3 . 
ane { +3No.2. Pentwyn + 1Scrap| Hot gray } areca cane 
{re NOs OR, WC alder oo.sico cack esownnicsmep Hot |Closebright 
3 . 
wot if +%4No.2. Pentwyn+ 3} Scrap} Hot gray } ir ip _ 
5 Nor i@alden. osc .cxtcete cess 2 Hot |Close bright : 
«82 i +4 No.2. Pentwyn-+ 4 Scrap) Hot gray } oa baad 
Supplementary Table. 
° 
Sees Protective Paint or Varnish. State of Covering after 387 days’ exposure. 
a 78 | Caoutchouc varnish, ...........0068 Rusted off in spots and partly removed... 
a 78 | Best white-lead paint.....,.......+. Rusted in spots; oil a removed ... 
a 79 | Copal varnish ...........0008 exceeds Varnish no longer Visible.....ssseseeseerereee 
a 79 | Asphaltum varnish..............000 Varnish no longer VISIUIC.pweascasaaseeees som 
a 80 | Mastich varnish .......... pen gewennes Coated thinly with extremely hard Tust ,.. 
OU | Swedish’taric.ccrccscseeesactes osacees Coat of thin rust; coating gone........+.++ 
a 81 | 3 parts wax + 2 parts tallow. ...| Coating changed into adipocere .....+++. a 
a 81 Coal-tar, laid on hot ............065 Coating still visible, with some lustre...... 
# 82 | Turpentine varnish. ............... Varnish scarcely visible. .........+++- er 
a 82 | Drying oil........ srosnbyecbeeesncckcc Varnish not visible. ...2<..cccascesceceos oooml 
