Marble Hill press., 1920-04-22

H,Fa.... -,-'..r. ~ '.a -.#a .l..I 'a f.r.-.ut
,.-rr., uf '.-. N'a 800 ,...'r. sr... .... =
.aHa NE simply ......-... h.a' ".... % t.rE ..S
r.s-.an.a H...rlH- 70 "" a"-0"r ni BEAT See
~raI .r 'H. .am. furnace.
gu. Nar 1890, Responsible f,r marE r,N devices
designed with 81 NI'H p. Increasing production
.u,.ls ur, ~ '., r.u1. tH" government need.
,d MOST pa, sl#f~.|a'- - ta,n. an3 100 building
ships ur ,r1ruuE. amount IT rIfrts hHte 2" he
heated aud ,la' qgInry. -" usual method "-
l.ati. 'lr-r rIs,'- was Ir H forge UvH'|s burn
lus ,uh" or u3 90, Fuel which was Hf''r a .ar"-
fuI survey found % be- wu"fu.y inefficient 10"
attendance was mr-". requiring % blower uar -
we'll %, a pa->.r; Iur-" gguu'.'', ~ r.N'~> ""-"
burned. welded together. ur iu.I.n"u'y heated
iu me fpr.. ana vh-u lt had 20 be- taken lu'o 'he
hold ~ N. ship for use the difficulties ~ up"r.
aiiuu we're only "Nre-Ird hy the ViI,TI"~s ~ %"
atmosphere resulting from The fumes - the forge.
The result was the electric riye' heater E,r's
ar,. now heated hy Inserting them between 'No
copper bars carrying a heavy currru, supplied
hy "a transformer Since ~" iron ~ ~" r'yr's
themselves is material of high resistance. they
mr.. heated thoroughly and quickly. III" bars are
operat,sl by foo, pedal 50 that when the r.y"ts
are removed. or ar" teug placed In position 10
be- heated the current ceases TO flow. The whole
apparatus is easily portable.
Il was founa ,6nt this simple machine heated
the rivrts throughout: that. lnasmuch a. the
ergy was used only when the rivets wer" actually
being heated there was no waste OF hcat; that
there were no noxious fumes or spoiled and vast
I'd riyets and that the machine was nearly fool
proof The attendance was reduced 20 mini.
mum and there necessity of supplying
fuel with the consequent trouble in disposng Of
the ashes when II was being operated In more
or lrsS inaccessible parts OF ship. II has ca
pacity of 500 A-lnCh rivets ! inch long per
hour which Is enough under ordinary conditions
for gang Of gun riv"ters.
The place where electric heat has found It's
greatest application from the standpoint Of num-
ber Of installations at least is in the electrically
heated oven, air-drying and baking apparatus
as one prefers 1t is surprising how many prod
ucts that are necessities Of our everyday life
qulre an oven treatment somewhere in the course
Of their manufact cture.
Electric ovens are used more in the automobile
industry than In any other field Here 10000
XIV are used in baking the Japan on 1900 auto
mobile bodies every day. In few years the au-
tomobe whose japanned parts not baked in
an electric oven will be rarity. Other large
users Of electric foundries, for baking
cores telephone and typewriter manufacturers:
manufacturers Of iron and bed frames and chem
ical manufacturers OF various sorts
oven processes include baking, air tempering,
drying and sherardizing. OF these four the first
Is the most used, the other two are quite
mon, and the last Is process for protecting
posed iron parts from corrosion.
In many of these processes accurate regulation
Of heat and automatic control are absolutely nee
essary because many materials are irrevocably
ruined by n slight change In the temperature of
the oven. And here again manufacturers have
found that the saving in material which was
spoiled by the vagares Of the fueheated furnace
has than paid for the increased expense Of
installing and operating bank Of electric ovens.
OF these three classes Of ovens, those installed
for baking are the most numerous. The work
they do varies: baking japan on various articles.