In about 1917, all 18-pounders began to be fitted with a new calibrating range scale.
2.
The second was the suitable design for a range scale in yards able to accommodate a choice of propelling charges.
3.
On the front of the sight there is both a ranging scale and a grid which enables the operator to fire at moving targets.
4.
The elevation scale, range drum, and sight are on the right side of the carriage; the range scale is graduated up to 42 degrees.
5.
Clinometers had several other names including " gunner's level ", " range scale ", " elevation drum " and " gunner s quadrant " and several different configurations.
6.
The rocking bar and telescope were retained for direct fire, as was the range scale on the right in spite of a clinometer being part of the Dial Sight mount.
7.
This carrier had muzzle velocity corrector scale and an elevating arc below the sight mount, the arc was fitted with a choice of range scales depending on the ammunition being used.
8.
Initially the 60 pounder was fitted with tangent sights on a rocking bar with the range scale graduated to 10, 400 yards and 22 degrees, the rear sight had a deflection scale.
9.
With two range scales, 0 9 and 0 36 miles, it could detect surfaced U-boats at up to and land at up to 70 miles, though a typical U-boat detection range was 5 miles.
10.
Plate XXVI shows the gun arm ( although the range scale on its edge is not visible ), which points here toward the top of the photo ( in the 11 : 30 position ).
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