163 
of Edinburgh, Session 1869 - 70 . 
parallel was gained for the angle of the grand gallery. By draw¬ 
ing a horizontal line between the two air-channel mouths, and 
dropping perpendiculars from these to the base, two oblongs are 
formed, one on each side of the axis; the diagonals of each of 
these being the unit angle. 
The astronomical hearing of the Pyramid seems manifestly to 
be indicated in the sections of the King’s Chamber. In the sec¬ 
tion of it in its breadth, the chamber is filled up by—first, a section 
of the Pyramid itself, the base of which is the floor line of the 
chamber; the space above, as regards height, being filled by an 
equilateral triangle, its angles 60°, corresponding as they do with 
the direction of the celestial equator, 60° seem to point with 
threefold force to the fact that the Pyramid has a direct reference 
to the sun. 
The same is twice repeated in the section of the King’s 
Chamber in its length, the length of the chamber being exactly 
twice its breadth. Another very marked reference of the same 
kind occurs in the position that the Queen’s Chamber hears to the 
King’s Chamber. If an equilateral triangle, whose apex is in the 
centre of the floor of the King’s Chamber, he constructed, having 
its base in the base line of the Pyramid, the centre of the floor 
of the Queen’s Chamber will he found to be exactly in the middle 
of the north limb of this triangle, other instances are also shown 
to he regulated by the equilateral triangle. 
The unit angle regulates the length and height of the King’s 
Chamber, the space between it and the ante-chamber, the form of 
the ante-chamber, and the distance to the great step, also the in¬ 
terior length, breadth, and depth of the much-abused granite 
coffer. 
Coffer Unit Bloch. 
Breadth, jg part of interior length of coffer. 
Height, l „ „ depth „ 
Thickness, ^ ,, ,, breadth ,, 
90 of these cover one side of coffer. 
90 ,, bottom „ 
450 exactly fill coffer. 
The shape of this block is regulated by the unit angle in its top 
sides and face, and consequently conserves the Pyramid facial 
