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(1) £2360 9s. 91d.

(1) 50 yds. 1 ft. 6 in.: £9 7s. 6d. (2) £4098 7 2

(2) £1 68. 3 d.

(3) £2 5 0

£3 3 103

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(3) 4d. on 5s. 8d. causes the greater loss by 6s. 6d. per cent.

(4) £219 2s. 3d.

PAGE 389.

(1) 3899 ac. 1 r. 27 p.
(2) £13705 17s. 6d.
(3) 250 ft. per min.

3600 stones: £281 5s. (5) £2 5s. 111d. (6) 2 hrs. 11 min. 20 sec.

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For Mixing and Preparing Medical Prescriptions.

20 grains = 1 scruple (sc.)

3 scruples

8 drams

=

1 dram.

= 1 ounce.

12 ounces = 1 lb.

The grain, ounce, and pound, are the same as in troy weight.

TROY WEIGHT,

For Precious Stones and Metals, and in Philosophical Experiments.

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Land is usually measured by a chain of 100 links, and 22 yards in length. A square chain is, therefore, 10,000 square links, or 484 square yards, i.e. th of an

acre.

And an acre is 100,000

square links.

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SQUARE OR SUPERFICIAL MEASURE.

144 square inches:
9 square feet
304 square yards
(272 square feet)
40 square rods
4 roods

=

1 square foot. = 1 square yard.

1 square rod, pole, or perch.
1 rood

= 1 acre

(10 square chains, 100,000 square links, 4840 square yards).

640 acres

= 1 square mile.

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