Vertical rods on Abacus are used to represent the place value of number. If the centre rod of Abacus is place of One's or Unit, the immediate next rod to the left is theplace of Ten's and the immediate nest rod to the left of Ten's is Hundred's and so on and so forth for thousand, 100 Thousand, Million's etc.
A: For standard box springs, twin sizes are usually 38 or 39 inches wide by 75 inches long, and full sizes are 53 or 54 inches wide by 75 inches long. Queen- and king-size box springs are both 80 inches long, but measure 60 inches and 76 inches wide, respectively.
The length is greater than the length of the twin tube because due to the equalization chamber is located above the working chamber. It has sufficient room for valves and passages.  The working piston has a diameter of 24.4mm for a small bore, 28.3 for a medium bore, and 39.7mm for a large bore.