702
THEORY AND PRACTICE OF ENGINEERING.
Book II.
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Cohesive Powers.
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Names of Quar-ries fromwhence -Speci-mens are pro-cured.
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Ancaster
Ditto
Ditto
4585-44)43-1
4584-0
4512-0
49203
336-3
0-1G6
7-2
24
33
2-182
2-G87
0-180
Bath Box -DittoDitto
3767-8
38763
37GG-8
3875-5
4109-0
342-4
0-169
20-0
IS
21
1-839
2-675
0-312
Portland
Ditto
Ditto
4302-9
4306-9
4300-4
4305-0
4375-1
275-1
0-135
2-7
30
55
2-145
2-702
0-206
Ketton
Ditto
Ditto
4412-8
4313-2
4409-7
43095
4715-6
305-9
0 151
3-3
22
36
2-045
2-706
0244
Results of experiments upon cubes of 2-inch sides in duplicate.
Results of experimentsupon cubes of 1-inchsides.
Magnesian Limestone or Dolomite , when of a crystalline character, and with nearlyequivalent proportions of carbonate of lime and carbonate of magnesia, is preferred to mostothers, on account of the uniformity of its texture, and the facility with which it is worked.Like common limestone it can be formed into mortar, though it remains much longercaustic than quicklime made from the latter; this constitutes the important ditference be-tween magnesian and common limestones when employed in agriculture ; the lime madefrom the magnesian variety is hot and injurious to the fertility of the soil.
Bolsover.
Huddlestone.
Roach Abbey.
Park Xook.
Silica
_
3-6
2-53
0-8
0*0
Carbonate of lime
-
-
51 *1
54-19
57 *5
55 7
-of magnesia
-
-
40*2
41*37
39-4
41 *6
Iron alumina
-
-
1-8
0*30
0 7
0*4
Water and loss
.
3-3
1*61
1*6
2*3
Specific gravities of dry masses
-
2-316
2*147
2*134
2*138
- — - of partieles
-
-
2-833
2*867
2*840
2-847
Absorbent powers when
saturated
under the exhausted receiver of an
air-pump -
-
0-182
0*239
0*248
0*249
Disintegration — quantity
of
matter
disintegrated
-
-
1 -5 grs.
1 -9 grs.
0-6 grs.
1 -8 grs.
Cohesive powers
-
-
117
61
55
61
&
6
8
Cohesive Powers.
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Name ofQuarry fromwhence theSpecimen wasprocured.
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Bolsover
Ditto
4890-8
5052-2
4881-4
5043-0
5042-0
160-6
0 079
1-5
70
117
Ditto
2*316
Huddlestone
Ditto
4493*5
4447-4
4491-4
4445-9
4735*0
243-6
0*120
1*9
34
Cl
Ditto
2-147
Roach AbbeyDitto
4408 34424-6
4406-0
4422*5
47547
348*7
0*172
0*6
24
55
2-134
Park Xook -Ditto
4356-6
4519*2
4336*3
4509-3
4784-7
448-4
0 221
1-8
26
G1
Ditto
2-138
Results of experiments upon cubes of 2-inch sides iu duplicate.
2-833
2-867
2-844
0-182
0-239
0-248
2 847 | 0-249
Results of experimentsupon cubes of 1-inchsides.
The purity of all the limestones is readily determined by measuring the quantity ofcarbonic acid which is evolved during their solution in dilute nitric or muriatic acid :perfect carbonate of lime loses as much as 46 per cent, and when a smaller proportion isdriven off, we may infer that there is less weight of calcareous carbonate. Marls or otherearths containing lime may also be similarly tested by effervescing them with acids.