New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1870-03-19
POLYTECHNIC ASSOCIATION

At numerous meeting of this branch of the
American Institute. Prof s. d. Tllman in the chair the
following novelties were presented:
+ PIdnuasi,r-This instrument, exhibited by Mr.. A. c
Anderson excited unusual interest among the civil eng
necrs present 1t is the of Amser Laon Of
Switzerland and is used for asceraining the area
irregular plane figures it operates with great rapdty
and gives results exact than those obtained
by computations founded cOOrdnates and triangui-
on Numerous diagrams would be required to give our
readers clear idea Of this instrument We can only say
that graduated roller ana thit 10 ascertain
the included IN any survey ~ II on! necessary 10
pa-s ~ pointer along the boundary INES OF mop uta%
TO an exact scale III j. sha enough 10 %
uOcket and be purchased IN Europe Tor less udh ~
francs For complete de.srP,ol ol Ino c,c5 ' w.
practical operation OF the flahnete lue IeautI -
fcrrea To the yO.IWluou, and valuable reports recently
made by +. A. =. Barnard, IL d, United states CON
missioner 90 the FdIls lutIAdloAdI A. 1,-t.}H' 49,
q D,uuua0IrCter.-lAs invention, bF thiiit7 NraI NJ
BROOKLYN. was presented and explained 10y DIR, C. T. In
n rs. tested ar the last exhibition OF the American lst
tuc. II can Doe attached 10 any aiclut-ihe OF otneI
motor, and Wll ihth report I'D pu"Nt ~ t'l'' ~ ~.
fle actual amount OF force expended within 70 gwen
time II may also De use % ,ho" me amount OF "oh
r4r4f.vp value az lubricants by showing how much INC
uou s diminished OF increased 10y hs U.s. o.. e.,a s,c,
8. Ware N.'DH It.HI'ts- Pr JON. 81 ..i'.u v 80,
Maine. explained hIs method ~ Illustrating 20 tle r.!
tUr plan, said Do differed tHtlic4 rom tAl "-'II'' at
p4rttlr, of Prof LYMAN OF Yale t'lcsr winch oAy nus
-trumcnt illustrates me NoiAt.iy llI.n Vl an i %
musical strings By means OF tiuck"o. a. u rape 10
string the lower end beng weighted 10y smaI SnV'
The string divided into segmehts OF hOloh' auu tc
modal points are distinctly visible.
4. SfdD,poou,g Appqrai"S-Ihis complicated head
gear invented by Mr. l.. VIM, Is intended To protect The
neck and body during the operation Of washing the mar
10 consists OF huge helmet open on The top and fastened
tIcht around the forehead hy means OF mddrubbcr
hands A modification OF the instrument for the use VI
ladies was also shown. IL Is SAID the peasurabe sensa-
tiers experienced during the operation OF shampOOhe
with this continuance have already induced many TO puI
chase IT, -, - =
s. Sieain BgiierpiDc-Ths apparatus IN the form OF
class model exhibited by Mr G. W Coleman, Tor tho
urpDsa OF showing that the process OF rapid Do
ing the regular circulation OF water upward ana down.
ward tunder the most favorable CIRCUMSTANCES Is IN
needed and that the water IS thrown upward at reSu-
lar intervals. ., -. -. a..
The remainder OF the evening devoted 70 the ds-
cusson as the best form Of steam boilers II being con
coded that the sectOua. boiler more safe than the com
mon cylinder boiler the principal point at issue was the
best material To he used aud the manper OF guarding
against unequal expansion of parts by heat Mt CO.e
man gave lucid explanation OF the operation or the
cast-iron boiler invented by Joseph HARRISON IT, o.
Philadelphia Mr.. }. b. Root followed and took eXcep-
ton 10 some Of statements made and closed by SHOW"
me some of the advantages claimed for the boiler M.
vented by him. These two speakers certainly showed
considerable shrewdness IN their criticisms and let the
audience know pretty clearly al the objections WAl,h
can be raised TO either boiler The discussion was car
red on with great decOrum, and doubtless al VINO ns
tened concluded that either boiler l. great improve
meut On the old form