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of the Devonport Foundry, who has lately introduced them in mining boilers, and proved by them that the gauge-cock indicates a level of the feed of from one inch to one inch and three-quarters higher than the real height of the water: thus allowing the chance of accident by explosion. The two cocks possess all the properties of the three cocks and stuffing-boxes of the old watergauges.

One of these gauges has been employed in H.M. Dock Yard, Devonport, under a steam pressure of 50 lbs. for the last two years.

Under a water-pressure test, a gauge having an aperture six inches long and three-fourths of an inch wide, with talc one-fortyeighth of an inch thick, resisted a pressure of 200 lbs. to the square inch.

For locomotive and marine boilers, where the liability to accident is so great, the superior strength of the new material is of the first importance; and as a means of viewing the process of raising steam in the boiler it may be of much use, the talc being placed in the iron plate on each side of the boiler and allowing the light to pass through.

Improved Penholder.

BY MR. JAMES GOODFELLOW.

In this instrument the pen was held by a small cylinder, which moved easily in a tube, the cylinder being kept in its position by a light coiled spring within the tube. This spring gave the pen a great deal of flexibility, and prevented the point from entering the paper when writing with rapidity.

Perpetual Almanac.

BY JOHN ORAM, Esq., H.M. DOCK YARD, Devonport.

TUESDAY SEPTEMBER

THIS Almanac forms a neat ornament for the chimney-piece or office, and would make an appropriate pedestal for a bracket clock;-its general appearance is represented in the annexed cut. In the inside are prisms, on which are printed the days of the week, the days of the month, the months of the year, and as many years as may be thought necessary. These prisms turn on their axes by means of the knobs at the side,

(2)

1852

and are to be moved so as to shew, through the openings in front, the current date.

Meteorological Summary of the Weather at

Helston, in Lat. 50° 7' N., Long. 5° 18′ W., for the year 1852,
from Registers kept by M. P. Moyle, Esq.
MONTHLY MEANS OF THE BAROMETER.

Cistern 106 feet above mean sea level.

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in. 1.210 0.192 0.606 1.266 0.144 0.475

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January 29-688 29-669 29-664 29.675 0.00429-671 0.298 29.373 30-267 17 29-057 11 February. 30.046 30-032 30-026 30-033 0.003 30-030 0.259 29-771 30-541 23 29-275 8 March 29.995 29.985 29.982 29.988 0.007 29.981 0.260 29-721 30.614 5 29-023 29 29.951 29-950 29.942 29.945 0.004 29.941 0.278 29.819 29.824 29-824 29.821 0.002 29.819 0.330 29.610 29.625 29.629 29.621 0.001 29.620 0.392

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in.

in.

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1.591 0.080 0.230
29.663 30.207 9 29-551 22 0.656 0.064 0.212 21 0.529 31 & 1 0.103
29-489 30.174 6 29-358 18 0.816 0.074 0.22719*0.360 13 & 14 0.110
29-228 29.983 24 29.087 16 0.896 0.105 0.349 13 0.432 15 & 16 0.115
29-408 30.123 22 29-675 17 0.448 0.051 0.144 27 0.230 23 & 24 0.063
29-263 30-222 23 28.800 11 1.422 0.095 0.482 11 0.768 10 & 11 0.124
0.078 0-330 210-659 20 & 21 0.143

July 29-897 29-899 29.913 29.903 0.002 29.901 0.493 August.. 29.709 29-730 29-735 29-725 0.004 29.721 0.458 29.839 29.830 29-830 29-833 0.004 29.829 0.396 29-433 30-400 23 29.119 18 1.281 October. 29-749 29-753 29.780 29.761 0.006 29-755 0.331 29-424 30-338 19 28-791 26 1.547 November 29-444 29-441 29-476 29.454 0.004 29-450 0.349 29-101 30.165 9 28-701 16 December 29-619 29.600 29.610 29.609 0.003 29.606 0.355 29.251 30.086 18 28.976 15

Means 29.780 29-778 29-784 29-780 0.003 29-777 0.349 29-427 30.260

29.118

0.124 0.370 5 0.801

25 & 26 0.167

1-464 0.195 0-704 | 23 (*1-105 (23 & 24 0.217 1.110 0.140 0.627 26 0.985 17 & 19 0.149

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Remarks.-0.121 in. should be added to all the readings of the Barometer for its elevation of 106 feet above mean sea level. The Barometer is a standard with 0-6 in. bore, having a glass cistern 3 ins. diameter, whereby the ivory point of the scale can, by sight, be brought accurately to the surface of the mercury; the open end of the tube has a ring of platina foil, as recommended by Daniell, and the tube was filled in vacuo with mercury of specific gravity 13.5.

TABLE No. 1.

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13.0 51.6 38.4 45.0 0.4 44.6 13.2 57.0 thrice 29.0 23 28.0 43.0 14.052.1 41.0 46.5 1.0 45.5 11.1 67.0 24 33.0 25 24.0 50.0

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1.4 44.8

2.8 41.4

2.1 49.5

3.1 46.4

Jan. 45.9 44.5 48.0 46.2 46.1 44.4 46.6 0.4 46.2 45.1 0.1 45.0 1.2 43.4 2.8 14.0 53.2 40.6 46.9 0.2 46.7 12.6 57.0 8 32.0 2 & 9 25.0 44.5
Feb. 44.1 42-2 47.7 44.5 43.6 41.5 45.1 0.6 44.5 42.7 0.4 42.3 2.2 39.4 5.1
Mar. 45.1 42.5 48.9 45.0 44.4 41.9 46.1 1.5 44.6 43.1 0.7 42.4 2.2 39.5 5.1
April 49-3 46.0 52.9 48.1 47.5 44.6 49.8 2.2 47.6 46.2
2.3 52.6 51.6

6.2

6.2

May 54.6 51.5 57.5 53.2 52.6 50.2 54.9 June 57.9 55.1 61.4 57.1 56.1 54.0 58.4 3.0 55.4 55.4 2.0 53.4 2.0 51.4 4.0

12.0 57.2 42.9 50.0 1.5 48.5 14.3 67.0 23 44.0

12.0 61.1 48.3 54.7 1.7 53.0 12.7 70.0 17 40.0 10.0 64.9 52.2 58.5 1.8 56.7 12.7 72.0

4.3 58.2

6.9

15.0 75.9 57.1 66.5 1.9 64.6 18.8 85.0

July 67.3 62.3 70.3 63.4 64.4 60.6 67.3 2.2 65.1 62.1 1.3 60.8
Aug. 63.9 60.0 67.0 61.0 61.2 58.4 64.0 2.1 61.9 59.8 1.4 58.4 3.5 56.0 5.9
Sept. 60.1 56.3 62.9 57.5 57.7 54.7 60.2 1.7 58.5 56.1 1.2 54.9 3.6 51.7 6.8
Oct. 52.7 50.2 55.0 51.5 50.6 48.1 52-7 0.8 51.9 49.9 0.7 49.2 2.7 46.5 5.4

13.0 73.0 54.9 63.9 1.7 62.2 18.1 84.0 12.0 68.3 50.8 59.5 1.3 58.2 17.5 75.0

12.0 60.0 46.3 53.2 1.0 52.2 13.7 67.0

4 23.0 55.5

3 30.0 55.0

9 550 13 17.0 63.5

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Nov.51.8 50.6 52.8 51.0 50.3 48.9 51.6 0.5 51.1 50.1 0.5 49.6 1.5 48.0 3.1 15.0 56.8 46.2 51.5 0.4 51.1 10.6 63.0 13 32.0 30 31.0 47.5 Dec. 50-7 49.1 52.0 50.7 51.0 50.0 51.2 0.2 51.0 49.9 0.149.8 1.2 48.5 2.5 8.0 55.7 47.1 51.4 0.0 51.4 8.659.0 11 38.0 28 21.0 48.5 Means 53.6 50-8 56.4 52.4 52.1 49.8 53.9 1.4 52.5 51.0 1.0 50.0 2.5 47.5 5.0 12.5 60.8 47.1 53.9 1.0 52.9 13.6 68.5 39.5 26.6 54.0 are on Rutherford's principle and have been compared with an accurate Standard Thermometer, and index error allowed for.

Mean range.

Maximum.

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The force of the wind is estimated from observations from 0 to 6.

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