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TOM SWIFT AND HIS AIR GLIDER
;How much pressure do you want�拭─�asked Ned。
;I ought to get above twelve hundred With the way the motor is geared�察�
but I'll go up with ten。 Watch the needle for me。;
It may be explained that when aeroplanes are tested on the earth the
propellers are set in motion。 This of course would send a craft whizzing
over the ground�察�eventually to rise in the air�察�but for the fact that a rope�察�
attached to the craft�察�and to some stationary object�察�holds it back。
Now if this rope is hooked to a spring balance�察�which in turn is made
fast to the stationary object�察�the ;thrust; of the propellers will be registered
in pounds on the scale of the balance。 Anywhere from five hundred to nine
hundred pounds of thrust will take a monoplane or biplane up。 But Tom
wanted more than this。
Once more the motor coughed and spluttered�察 �and the big blades
whirled about so fast that they seemed like solid pieces of wood。 Tom
stood on the ground near the levers which controlled the speed�察�and Ned
watched the scale。
;How much�拭─�yelled the young inventor。
;Eight hundred。;
Tom turned on a little more gasolene。
;How much�拭─�he cried again。
;Ten hundred。 That'll do� ─�
;No�察�I'm going to try for more。
Again he advanced the spark and gasolene levers�察 �and the
comparatively frail craft vibrated so that it seemed as if she would fly
apart。
;Now�拭─�yelled Tom。
;Eleven hundred and fifty� ─�cried Ned。
;Good� �That'll do it。 She'll give more after she's been running a while。
We'll go up。;
Ned scrambled to his seat�察�and Tom followed。 He had an arrangement
so that he could slip loose the retaining rope from his perch whenever he
was ready。
Waiting until the motor had run another minute�察 �the young inventor
pulled the rope that released them。 Over the smooth starting ground that
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TOM SWIFT AND HIS AIR GLIDER
formed a part of the Swift homestead darted the aeroplane。 Faster and
faster she moved�察�Ned gripping the sides of his seat。
;Here we go� ─�cried Tom�察�and the next instant they shot up into the air。
Ned Newton had ridden many times with his chum Tom�察 �and the
sensation of gliding through the upper regions was not new to him。 But
this time there was something different。 The propellers seemed to take
hold of the air with a firmer grip。 There was more power�察�and certainly the
speed was terrific。
;We're going fast� ─�yelled Ned into Tom's ear。
;That's right�察─�agreed the young inventor。 ;She'll beat anything but my
Sky Racer�察�and she'd do that if she was the same size。; Tom referred to a
very small aeroplane he had made some time before。 It was like some big
bird�察�and very swift。
Up and onward went the remodeled airship�察 �faster and faster�察 �until�察�
when several miles had been covered�察 �Ned realized that the young
inventor had achieved another triumph。
;It's great�察�Tom� �Great� ─�he yelled。
;Yes�察�I guess it will do�察�Ned。 I'm satisfied。 If there was an international
meet now I'd capture some of the prizes。 As it is;
Tom stopped suddenly。 His voice which had been raised to overcome
the noise of even the muffled motor�察 �sounded unnaturally loud�察 �and no
wonder�察�for the engine had ceased working� �
;What's the matter�拭─�gasped Ned。
;I don't knowa breakdown of some kind。;
;Can you get it going again�拭─�
;I'm going to try。;
Tom was manipulating various levers�察 �but with no effect。 The
aeroplane was shooting downward with frightful rapidity。
;No use� ─�exclaimed the young inventor。 ;Something has broken。;
;But We're falling�察�Tom� ─�
;I know it。 We've done it before。 I'm going to volplane to earth。;
This�察�it may be explained�察�is gliding downward from a height with the
engine shut off。 Aeroplanists often do it�察�and Tom was no novice at the art。
They shot downward with less speed now�察�for the young inventor had
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TOM SWIFT AND HIS AIR GLIDER
thrown up his headplanes to act as a sort of brake。 Then�察�a little later they
made a good landing in a field near a small house�察 �in a rather lonely
stretch of country�察�about ten miles from Shopton�察�where Tom lived。
;Now to see what the trouble is�察─�remarked our hero�察�as he climbed out
of his seat and began looking over the engine。 He poked in among the
numerous cogs�察�wheels and levers�察�and finally uttered an exclamation。
;Find it�拭─�asked Ned。
;Yes�察 �it's in the magneto。 All the platinum bearings and contact
surfaces have fused and crystallized。 I never saw such poor platinum as
I've been getting lately�察�and I pay the highest prices for it�察�too。 The trouble
is that the supply of platinum is giving out�察 �and they'll have to find a
substitute I guess。;
;Can't we go home in her�拭─�asked Ned。
;I'm afraid not。 I've got to put in new platinum bearings and contacts
before she'll spark。 I only wish I could get hold of some of the better kind
of metal。;
The magneto of an aeroplane performs a service similar to one in an
automobile。 It provides the spark that explodes the charge of gas in the
cylinders�察 �and platinum is a metal�察 �more valuable now than gold�察 �much
used in the delicate parts of the magneto。
;Well�察�I guess it's walk for ours�察─�said Ned ruefully。
;I'm afraid so�察─�went on Tom。 ;If I only had some platinum�察�I could;
;Perhaps I could be of service to you�察─�suddenly spoke a voice behind
them�察�and turning�察�the youths saw a tall�察�bearded man�察�who had evidently
come from the lonely house。 ;Did I hear you say you needed some
platinum�拭─�he asked。 He spoke with a foreign accent�察�and Tom at once put
him down for a Russian。
;Yes�察�I need some for my magneto�察─�began the young inventor。
;If you will kindly step up to my house�察�perhaps I can give you what
you want�察─�went on the man。 ;My name is Ivan Petrofsky�察�and I have only
lately come to live here。;
;I'm Tom Swift�察 �of Shopton�察 �and this is my chum�察 �Ned Newton�察─�
replied the young inventor�察 �completing the introductions。 He was
wondering why the man�察�who seemed a cultured gentleman�察�should live in
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TOM SWIFT AND HIS AIR GLIDER
such a lonely place�察�and he was wondering too how he happened to have
some platinum。
;Will that answer�拭─ �asked Mr。 Petrofsky�察 �when they had reached his
house�察 �and he had handed Tom several strips of the precious silverlike
metal。
;Do�拭�I should say it would� �My�察�but that is the best platinum I've seen
in a long while� ─�exclaimed Tom�察�who was an expert judge of this metal。
;Where did you get it�察�if I may ask�拭─�
;It came from a lost mine in Siberia�察─�was the unexpected answer。
;A lost mine�拭─�gasped Tom。
;In Siberia�拭─�added Ned。
Mr。 Petrofsky slowly nodded his head�察�and smiled�察�but rather sadly。
;A lost mine�察─�he said slowly�察 �and if it could be found I would be the
happiest man on earth for I would then be able to locate and save my
brother�察 �who is one of the Czar's exiles�察─ �and he seemed shaken by
emotion。
Tom and Ned stood looking at the bearded man�察�and then the young
inventor glanced at the platinum strips in his hand while a strange and
daring thought came to him。
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TOM SWIFT AND HIS AIR GLIDER
CHAPTER II
A DARING PROJECT
While Tom and his chum are in the house of the Russian�察 �who so
strangely produced the platinum just when it was most needed�察�I am going
to take just a little time to tell you something about the hero of this story。
Those who have read the previous books of this series need no
introduction to him�察�but in justice to my new readers I must make a little
explanation。
Tom Swift was an inventor�察 �as was his father before him。 But Mr。
Swift was getting too old�察�now�察�to do much�察�though he had a pet invention´
´that of a gyroscopeon which he worked from time to time。 Tom lived
with his father in the village of Shopton�察�in New York state。 His mother
was dead�察�but a housekeeper�察�named Mrs。 Baggert�察�looked after the wants
of the inventors�察�young and old。
The first book of the series was called ;Tom Swift and His Motor´
Cycle�察─ �and in that I related how Tom bought the machine from a Mr。
Wakefield Damon�察 �of Waterford�察 �after the odd gentleman had
unintentionally started to climb a tree with it。 That disgusted Mr。 Damon
with motor´cycling�察�and Tom had lots of fun on the machine�察�and not a few
daring adventures。
He and Mr。 Damon became firm friends�察 �and the oddity of the
gentlemanmainly that of blessing e