Analysis of information sources in references of the Wikipedia article "Bearing (mechanical)" in English language version.
... Egyptians used wooden sleds to haul the stone, but until now it hasn't been entirely understood how they overcame the problem of friction. [... They] placed the heavy objects on a sledge that workers pulled over the sand. [...] 'Research ... revealed that the Egyptians probably made the desert sand in front of the sledge wet.' [...] Adding more evidence to the conclusion that Egyptians used water is a wall painting in the tomb of Djehutihotep. A splash of orange and gray, it appears to show a person standing at the front of a massive sledge, pouring water onto the sand just in front of the progressing sled.
... Egyptians used wooden sleds to haul the stone, but until now it hasn't been entirely understood how they overcame the problem of friction. [... They] placed the heavy objects on a sledge that workers pulled over the sand. [...] 'Research ... revealed that the Egyptians probably made the desert sand in front of the sledge wet.' [...] Adding more evidence to the conclusion that Egyptians used water is a wall painting in the tomb of Djehutihotep. A splash of orange and gray, it appears to show a person standing at the front of a massive sledge, pouring water onto the sand just in front of the progressing sled.