400 
Adjustable  Support  for  Funnels. 
Am.  Jour.  Pharm. 
Sept.,  1876. 
ADJUSTABLE  SUPPORTS  FOR  FUNNELS,  PERCOLATORS,  Etc. 
BY  E.  C.  H ■  HILDEBRAND. 
The  sides  of  an  equilateral  triangle  coming  as  tangents  in  contact 
with  the  periphery  of  an  inclosed  circle,  mark  out  in  the  latter  three 
arcs  of  equal  lengths  ;  further,  by  drawing  a  line  through  the  triangle 
parallel  to  one  of  its  sides,  an  equilateral  triangle  of  smaller  size  is 
formed,  relating  to  a  correspondingly  smaller  circle.  This,  in  a  few 
words,  is  the  theory  applied  in  the  construction  of  the  here  described 
adjustable  support  or  rack  for  funnels,  etc. 
An  opening  of  the  shape  of  an  equilateral  triangle  presents  a  very 
solid  rest  for  vessels  of  a  conical  or  spherical  form,  and  the  resistibility 
of  the  round  form  against  an  external  pressure,  exerted  in  three  sym- 
metrical points  on  its  circumference  is  very  large,  even  in  vessels  made 
of  thin  material.  As  it  is  very  desirable  to  have  in  the  pharmaceutical 
laboratory  a  series  of  supports  for  funnels,  etc.,  especially  now,  where 
the  process  of  repercolation  is  so  much  in  use,  I  think  this  adjustable 
rack  will  soon  prove  the  many  advantages  it  possesses  over  similar  ar- 
rangements of  this  kind. 
From  the  illustrations  it  will  be  seen  that  this  rack  represents  a  frame 
consisting  of  two  long  pieces  of  wood — staves  of  an  oblongly  square 
shape — A  B  and  C  D,  placed  in  a  divergent  position  to  each  other  and 
united  by  cross  pieces,  1,  2,  3,  etc.,  a  part  of  which  is  cut  out,  leaving 
an  open  spoce  of  60  degrees  (the  value  of  an  angle  in  an  equilateral 
triangle),  which,  together  with  the  following  crosspiece,  forms  the 
opening  for  the  reception  of  the  vessel.  As  gradually  by  the  divergence 
of  the  long  staves,  the  successive  openings  grow  larger,  they  are  quali- 
1  s 
X     o      SX      3      S  X__JL-S  * 
5       S  X 
S  X  7 
J  
SX-  SX  SX  SX  SX 
3  A-   5   _ 
1  r 
1  1 
F/C2. 
fied  to  receive  larger  vessels.  Each  of  these  openings  is  adjustable  to 
vessels  of  different  sizes.    To  fit  a  certain  opening  to  a  given  vessel, 
