Agricultural  Education — Examination  Papers , 1883.  xciii 
of  a solid  which  is  not  soluble,  and  does  not  float  in  water.  Why  is 
it  necessary  to  take  account  of  temperature  in  the  accurate  deter- 
mination of  specific  gravity?  For  instance,  would  the  specific 
gravity  of  a piece  of  platinum  taken  in  water  at  40°  F.  be  the  same 
as  if  it  were  taken  in  water  at  70°  F.  ? 
8.  Explain  briefly  the  formation  of  dew  on  a clear  night.  What 
is  the  dew-point?  When  water  is  drawn  from  a deep  well  in 
summer  time  and  put  into  a tumbler,  why  does  dew  commonly  form 
on  the  outside  of  the  tumbler  ? 
9.  Explain  briefly  the  mechanism  and  use  of  a steam  indicator,  and 
how  the  indicator-diagram  is  drawn. 
EXAMINATION  IN  MENSURATION  AND  SURVEYING. 
Maximum  Number  of  Marks,  100.  Pass  Number,  50. 
Thursday,  May  10th,  from  2 p.m.  till  5 p.m. 
1.  If  a four-sided  figure  were  drawn  to  scale  on  paper,  how  would 
you  find  its  area  ? In  what  way  would  the  process  be  simplified  if 
two  of  the  sides  were  parallel  ? 
An  embankment  passes  along  the  side  of  a hill ; the  slope  of  the 
hill  is  one  vertical  to  two  horizontal ; the  top  of  the  embankment  is 
horizontal  and  20  feet  wide ; the  slopes  of  the  sides  are  two  vertical 
to  one  horizontal ; the  length  of  the  longer  slope  is  30  feet ; draw  to 
scale  the  cross-section  of  the  embankment  and  find  its  area. 
2.  State  the  rule  for  finding  the  volume  of  a prismoid. 
Give  two  instances  of  solids  whose  volume  can  be  found  by  the 
prismoidal  rule. 
A heap  of  earth  is  made  on  level  ground ; its  base  is  rectangular 
and  is  40  feet  long  by  30  feet  wide ; its  top  is  at  a uniform  height  of 
10  feet  above  the  ground,  and  its  sides  have  a slope  of  one  vertical  to 
one  horizontal ; draw  to  scale  a horizontal  plan  of  the  solid,  and 
calculate  its  volume. 
3.  If  you  find  the  weight  of  a body  first  in  air  and  then  in  water, 
how  will  these  data  enable  you  to  calculate  its  volume  ? A body 
weighs  2 lbs.  5J  oz.  in  air,  and  1 lb.  6|  oz.  in  water ; find  its  volume 
in  cubic  inches. 
4.  Two  points  are  separated  by  an  impassable  swamp  or  pond, 
round  which  you  can  go  freely,  so  that  both  points  are  accessible ; 
explain  how  you  could  find  the  distance  between  the  points  if  you 
were  provided  with  a few  pointed  stakes  (or  piquets)  and  a measuring 
tape. 
5.  If  A and  P arc  two  points  of  which  P is  visible  but  wholly 
