The Pioche record. [volume] (Pioche, Nev.) 1908-1925, 1919-03-14
YANK INGENUITY LANDS us.
AT TOP OF WORLDS NAVIES

tain the maximum Of efficiency a, the
least possible cost.
The heating losses Of this type Of
motor are reduced TO minimufJ
amount. and require comparatively lit
tie attention; it Is also quite light ~
weight per horse power given on. and
has become very popular ON shore OF
recent years, mainly owing to its pow
erful starting torque and It's freedom
from commutators and brush gear.
"A burnt-out arinature-the perpet-
ual source of dread To other types ~
electric motor In practice--is praeti
cally unknown In this type, even when
put to such severe service as propeller
reversing. Indeed. Its depreciation un.
der proper conditions for which u
would be designed is as low as any
'other type of revolving mechanical ma
chinery. and owing to It's peculiar rum
ming character II Is especially suit
able for main marine propulsion work
on batileships. and especially as this
efficient electric motor can be designed
for large powers. while its cOnstruc-
tional details represent the WY acme
Of simplicity"
Halls Her Tendency to Lace.
A feature hich the captain also
noted. and laid much stress upon. was
the fact that 1t was impossible for this
type Of motor TO race" when the YES
sci was under heavy rolling or pitch
ing conditions, and thus allowing the
vessel to run at high speed even In a
severe gale and heavy seas, while the
load balanced itself automatically b.
/ tween heavily and lightly Immersed
propellers while under those operat-
ing conditions and without strainina
the ship AZ Is the case In every Othe.
type of propeller drive. and he esti
mated n great saving in fuel In con
nection with the propulsion of s,icl
wnrships when propelled under heavy
weather conditions. and so noted iT
the case of the New Mexico.
Captain Durtnall added that the sub
iect was then receiving close attention
on the part Of shipbuilders and Ell
gInecrs, forming the topic Of repeate,
discussions Of various engineering as
sociations, both In England an,
abroad. Electrical power transmits
sion for ship propulsion" he said
twas nigh Mt hand" aud he urged ma
val and mercantile engineers to max
themselves au fait with all the poten
tiallties Of this twentieth century In
vasion Of the orthodox methods O
steam propulsion on u direct propelle
drive"
"That. be 1t remembered. was te
years ago. and the matter did attrat
n considerable amount of favorabl
comment, but that was about as fur q
: II went.
! How Captain purtnaIl Won His Poir
One OF Captain Durtnall's chief cri
les was Sir Charles Parsons, who sal
he feared the system would prove
/. source Of grave danger to the engir
J, room crews, as IF a short circuit o
!. Cured they would all be poisoned b
!. copper poisoning from the fumes tn,
: would be given or And yet with
!. a year Sir Charles Parsons firm, /
;. gether with the Thompson Houstc
! Electric company (the English repr
sentatives Of the General Electr
:. company, U. s. Az, were both d
J, PENDANTS In actions brought by CAPITAL
), Durtnall before the comptroller ge
eral Of patents, In London, In viii.
they sought to infringe Captain Dur
nails patents, the settlement Of viii,
was brought about by Captain Dun
nall agreeing that he would be sati
! fed II disclaimer rs to this pol
! phase alternating current ship propl
y sion was inserted In the applicant
!. specifications.
II Since that time several successf
\ patent actions have been placed
!. the credit Of Captain Durtnall, who
n original invention Is considered bas
r. But the real reason why CAPITA
b. Durtnnll's invention was thrown dow