[Music]
many people wonder how the ancient
egyptians worked hard mining rocks
[Music]
many researchers have written in the
past that the ancient egyptians used
dolorite hammers displayed granite
these hammers were primitive dollarat
pebbles
two years ago we tried to work a granite
piece with a granite tool
it's hard to find dollar right in st
petersburg so we use granite cobbles
instead
in earlier experiments experts tried to
work stone with dollar rate tools
their efficiency was double that of what
we achieved using granite hammers
there's a reason for that when you work
a granite object with a granite tool
the hammer is destroyed as fast as the
process surface
that's why it's so time consuming
by contrast doloride is way tougher so
it should wear away more slowly than
granite
we assume dollarite will show a better
result the process will go faster
and will be more efficient so today
we're going to try and verify this
hypothesis
we also want to learn how much time the
rock will take to wear away
because there are different opinions
about this we've got a high precision
set of scales
and a piece of granite that nikolai
found on the roadside
[Music]
and our geologist friends got us some
dolorite stones
so today we're going to do this simple
experiment
we're going to weigh this granite rock
but first we'll cut it
because it's likely to be too heavy for
the scales after this
we'll work its surface with dolorite
count material depletion
and then compare the results we should
cut 10 kilograms off
because these scales aren't designed for
objects weighing over 60 kilograms
so we're going to decrease the weight to
make each piece weigh less than 60 kilos
[Music]
okay
[Music]
[Laughter]
[Music]
oh
[Music]
hey guys look it's a perfect weight 55
kilos after cutting and cleaning off the
dirt
cool two perfect for an angle grinder
a magic number
test way now here we have one granite
hammer
we got it by chipping away the original
rock
[Music]
its total weight is 2 kilograms 176
grams
now these dollarite hammers we've got a
few of them one kilogram
392 grams
this one is two kilograms 465 grams
the third one weighs 2 kilograms 554
grams
[Music]
the fourth is 4 kilograms and 65 grams
check it
[Music]
look a piece of dollarate came off
[Music]
while everyone's away hunting antelopes
and mammoths
someone is hammering a stone a perfect
hobby
look at this dust finely dispersed good
quality
ancient egyptian concrete was surely
made of this dust
and all the pyramids too yeah this dust
was made manually first
exactly the pyramids were drilled out of
giant rocks
one hour has passed it's time to weigh
our pyramid and to find out how much
granite came off
we'll check the weight of the dolorite
tools too
so that's our dollarate hammer number
two and if i got it right
its weight was two kilograms 456 grams
now it's two kilograms to 116 grams
if my calculation is accurate the total
depletion
is 239 grams
in theory granite tools are supposed to
be less effective than dollar right
tools
let's validate this theory
this granite rock where working is
coarse grained
not like the hammer which is small
grained
it's supposed to be like this most
researchers say
that the ancient egyptians used small
grain granite pieces for tools
coarse grained rocks were used as
working surface
[Music]
guys the granite till broke just as i
started working
it so we won't use it anymore
well it was obvious that working granite
surface with granite
would quickly wear out the hammer
we'll be using this dollarate hammer
the weight of the tool is close to those
the egyptians used in mines
to process large amounts of rock
you can even hear that the sound is
different this tool seems to be more
[Music]
effective
[Music]
so we have 53 kilograms and 56 grams
previously we had 54 kilograms and 42
grams
840 grams off right
[Music]
so this dollaraite piece weighs 3 kilos
834 grams
the experiment shows that a dollar right
tool gives a better result
it's heavy but it's more comfortable to
work with as a heavy tool bounces off
more easily from granite surface
working this rock was intense but
definitely not beyond our abilities
we've done the math and the speed of
processing is 311 cubic centimeters per
hour
working at this speed a group of 150
workers
would have cut out the famous aspen
obelisk in a little over two years
we've noticed that the hole we've made
is smooth and is similar to the
depression at the bottom of the trench
where the s1 obelisk rests to be honest
our result isn't quite as monumental as
the other experiments
if his calculations are accurate rex's
angle back got
better results in his experiments
but please remember that the egyptian
dolorete is more solid than dagistan
gabriel doloreite
that we used in our experiment
[Music]
i'd like to thank alexander hartchenko
and valerie sandmod for filming
valeri mihailov for his hospitality
senior hubless for editing this video
oleg kruglachov for his expert opinion i
would also like to thank our patrons
supporting us on patreon
and our youtube sponsors if you want to
see even more interesting experiments
please consider supporting us on patreon
i'm alexander sokolov
see you in the next video translated by
maria protopopova
voice over by dmitry oliverovich