﻿134 
  PROCEEDINGS 
  OP 
  THE 
  CALIFORNIA 
  

  

  According 
  to 
  Prof. 
  Whitney. 
  Caproscbeelite 
  has 
  the 
  following 
  composition 
  : 
  

  

  Tungstic 
  acid 
  79.69 
  

  

  Oxide 
  of 
  copper 
  6.77 
  

  

  Lime 
  10.95 
  

  

  Proto.xide 
  of 
  iron 
  31 
  

  

  Water 
  1.40 
  

  

  99.12 
  percent. 
  

  

  Mr. 
  S. 
  C. 
  Hastings 
  read 
  a 
  paper 
  on 
  Climatic 
  Changes. 
  

  

  Mr. 
  Wetmore 
  submitted, 
  for 
  the 
  inspection 
  of 
  the 
  members, 
  sev- 
  

   eral 
  skulls 
  taken 
  from 
  ancient 
  graves 
  in 
  the 
  upper 
  table-lands 
  of 
  the 
  

   western 
  slope 
  of 
  the 
  Andes, 
  in 
  Peru. 
  These 
  skulls 
  presented 
  some 
  

   marked 
  cranial 
  differences, 
  indicating 
  different 
  races. 
  Some 
  of 
  

   these 
  presented 
  the 
  peculiarities 
  of 
  the 
  Inca 
  type, 
  while 
  others 
  point 
  

   more 
  to 
  that 
  of 
  the 
  aboriginal 
  Indian, 
  and 
  show 
  a 
  marked 
  flattening 
  

   of 
  the 
  frontal 
  section, 
  which, 
  in 
  one 
  specimen, 
  is 
  traversed 
  by 
  a 
  

   median 
  suture 
  from 
  above 
  the 
  nasal 
  orifice 
  backward, 
  dividing 
  the 
  

   frontal 
  bone 
  equally. 
  

  

  Mr. 
  Stearns 
  announced 
  to 
  the 
  Academy 
  the 
  death 
  of 
  Col. 
  John 
  

   W. 
  Foster, 
  the 
  distinguished 
  geologist 
  and 
  ethnologist, 
  and 
  Pres- 
  

   ident 
  of 
  the 
  Academy 
  of 
  Sciences 
  of 
  Chicago. 
  

  

  On 
  motion 
  of 
  Dr. 
  George 
  Hewston, 
  Mr. 
  Stearns 
  was 
  appointed 
  a 
  

   committee 
  to 
  prepare 
  resolutions 
  appropriate 
  to 
  the 
  event. 
  

  

  On 
  an 
  Improved 
  Telemeter 
  for 
  Reconnaissance. 
  Engineering, 
  

   and 
  Military 
  Purposes. 
  

  

  BY 
  GEORGE 
  DAVIDSON. 
  

  

  The 
  fundamental 
  idea 
  of 
  this 
  telemeter 
  is 
  credited 
  to 
  General 
  Clerk, 
  R. 
  A., 
  

   P. 
  R. 
  S., 
  etc., 
  who 
  designed 
  it 
  for 
  military 
  purposes, 
  and 
  had 
  one, 
  of 
  two 
  feet 
  in 
  

   length, 
  made 
  by 
  Pastorelli 
  & 
  Co., 
  of 
  London, 
  [Engineering 
  for 
  November 
  15, 
  

   1872, 
  p. 
  333, 
  vol. 
  II), 
  with 
  a 
  mirror 
  at 
  each 
  end 
  and 
  two 
  in 
  the 
  center. 
  With 
  

   the 
  micrometer 
  eye-piece 
  he 
  " 
  obtained 
  great 
  accuracy 
  up 
  to 
  600 
  feet 
  distance," 
  

   and 
  the 
  results 
  were 
  " 
  tolerably 
  certain 
  up 
  to 
  3,000 
  feet." 
  A 
  similar 
  instru- 
  

   ment 
  of 
  six 
  feet 
  in 
  length 
  gave 
  good 
  results 
  at 
  three 
  thousand 
  jards. 
  

  

  The 
  improvement 
  which 
  we 
  have 
  made, 
  in 
  addition 
  to 
  some 
  matters 
  of 
  de- 
  

   tail, 
  is 
  what 
  may 
  be 
  called 
  a 
  repeating 
  micrometer, 
  with 
  a 
  screw 
  of 
  much 
  finer 
  

   thread 
  than 
  used 
  in 
  the 
  above 
  instruments, 
  where 
  one 
  micrometer 
  division 
  was 
  

   eleven 
  seconds 
  of 
  arc. 
  In 
  the 
  micrometers 
  of 
  the 
  Coast 
  Survey 
  Field 
  Transits, 
  

   Zenith 
  Telescopes 
  and 
  Theodolites, 
  the 
  micrometer 
  divisions 
  range 
  in 
  value 
  from 
  

  

  