﻿tt24 
  /Scientific 
  Intelligence. 
  

  

  13. 
  Descrizione 
  di 
  una 
  Macchinetta 
  Elettro-Magnetica 
  ; 
  by 
  

   Dk. 
  Antonio 
  Pacinotti. 
  Pp. 
  95, 
  with 
  2 
  plates. 
  Bergamo, 
  1912 
  

   (Istituto 
  Italiano 
  d'Arti 
  Grafiche). 
  — 
  This 
  little 
  book 
  was 
  pub- 
  

   lished 
  under 
  the 
  auspices 
  of 
  the 
  Associazione 
  Elettrotechnica 
  

   Italiana. 
  It 
  is 
  an 
  extract 
  from 
  the 
  "JSfuovo 
  Cimento" 
  of 
  June 
  

   1864 
  which 
  appeared 
  May 
  3, 
  1865. 
  Tn 
  addition 
  to 
  the 
  original 
  

   Italian 
  the 
  text 
  is 
  given 
  in 
  French, 
  English, 
  German, 
  and 
  Latin. 
  

   The 
  respective 
  translators 
  were 
  Paul 
  Janet, 
  S. 
  P. 
  Thompson, 
  Gis- 
  

   bert 
  Kapp, 
  and 
  P. 
  Rasi. 
  The 
  paper 
  consists 
  in 
  an 
  account 
  of 
  the 
  

   model 
  of 
  a 
  small 
  electromagnetic 
  machine 
  which 
  was 
  constructed 
  

   by 
  Pacinotti 
  in 
  1860 
  for 
  the 
  Cabinet 
  of 
  Technological 
  Physics 
  

   of 
  the 
  University 
  of 
  Pisa. 
  As 
  is 
  well 
  known, 
  the 
  work 
  of 
  Paci- 
  

   notti 
  played 
  an 
  important 
  part 
  in 
  the 
  development 
  of 
  electro- 
  

   magnetic 
  machinery, 
  and 
  hence 
  this 
  collection 
  of 
  translations 
  is 
  

   both 
  interesting 
  and 
  valuable 
  from 
  the 
  historic 
  standpoint. 
  The 
  

   first 
  plate 
  is 
  a 
  picture 
  of 
  Pacinotti, 
  and 
  the 
  second 
  plate 
  contains 
  

   four 
  figures 
  of 
  plans, 
  sections, 
  etc., 
  of 
  the 
  machine. 
  h. 
  s. 
  u. 
  

  

  14. 
  V 
  attraction 
  universelle 
  consider 
  'ee 
  comme 
  fonction 
  du 
  

   temps 
  ; 
  by 
  A. 
  N. 
  Panoff. 
  Pp. 
  6. 
  Reprint 
  from 
  Astron. 
  Nadir., 
  

   vol. 
  cxciv, 
  March, 
  1913. 
  — 
  The 
  author's 
  reasoning 
  is 
  based 
  on 
  the 
  

   assumption 
  that 
  gravitational 
  forces, 
  like 
  electromagnetic 
  forces, 
  

   are 
  propagated 
  with 
  finite 
  velocity. 
  Expressions 
  for 
  the 
  retarded 
  

   potential 
  and 
  the 
  aberration 
  of 
  the 
  force 
  due 
  to 
  a 
  moving 
  body 
  

   are 
  developed, 
  and 
  the 
  theory 
  is 
  applied 
  to 
  the 
  orbital 
  motion 
  of 
  

   the 
  planets. 
  The 
  methods 
  employed 
  do 
  not 
  appear 
  to 
  be 
  essen- 
  

   tially 
  different 
  from 
  those 
  introduced 
  by 
  Lorentz 
  into 
  electro- 
  

   magnetic 
  theoiy, 
  and 
  applied 
  to 
  gravitational 
  fields 
  by 
  numerous 
  

   authors. 
  l. 
  p. 
  

  

  II. 
  Geology 
  and 
  Mineralogy. 
  

  

  1. 
  Publications 
  of 
  the 
  United 
  States 
  Geological 
  Survey. 
  — 
  

   Recent 
  publications 
  of 
  the 
  IT. 
  S. 
  Geological 
  Survey 
  are 
  noted 
  in 
  

   the 
  following 
  list 
  (continued 
  from 
  p. 
  77) 
  : 
  

  

  Professional 
  Papers. 
  — 
  No. 
  78. 
  Geology 
  and 
  Ore 
  Deposits 
  

   of 
  the 
  Philipsburg 
  Quadrangle, 
  Montana 
  ; 
  by 
  William 
  II. 
  Em- 
  

   mons 
  and 
  Frank 
  C. 
  Calkins. 
  Pp. 
  271 
  ; 
  17 
  pis., 
  55 
  figs. 
  

  

  No. 
  79. 
  Recurrent 
  Tropidoleptus 
  Zones 
  of 
  the 
  Upper 
  Devo- 
  

   nian 
  in 
  New 
  York 
  ; 
  by 
  Henry 
  S. 
  Williams. 
  Pp. 
  103 
  ; 
  6 
  pis., 
  

   18 
  figs. 
  

  

  No. 
  80. 
  Geology 
  and 
  Ore 
  Deposits 
  of 
  the 
  San 
  Francisco 
  and 
  

   Adjacent 
  Districts, 
  Utah; 
  by 
  B. 
  S. 
  Butler. 
  Pp. 
  212 
  ; 
  41 
  pis., 
  

   16 
  figs. 
  

  

  No. 
  85-A. 
  The 
  Origin 
  of 
  Colemanite 
  Deposits 
  ; 
  by 
  Hoyt 
  S. 
  

   Gale. 
  Pp. 
  9. 
  

  

  Bulletins. 
  — 
  No. 
  465. 
  The 
  State 
  Geological 
  Surveys 
  of 
  the 
  

   United 
  States 
  : 
  compiled 
  under 
  the 
  direction 
  of 
  C. 
  W. 
  Hayes. 
  

   Pp. 
  177. 
  

  

  