Things To Make

,
and one finishes by soft-soldering the boiler top to the barrel and fixing
in the seatings for the water and steam gauges, safety-valve, mud-hole,
filler, and pump-if the last is fitted.

The furnace is lined with a strip of stout sheet iron, 7 inches wide and
19-1/4 inches long, bent round the barrel, which it overlaps for an inch
and a half. Several screws hold lining and barrel together. To promote
efficiency, the furnace and boiler is jacketed with asbestos--or
fire-clay round the furnace--secured by a thin outer cover. The enclosing
is a somewhat troublesome business, but results in much better steaming
power, especially in cold weather. Air-holes must be cut round the bottom
of the lining to give good ventilation.

A boiler of this size will keep a 1 by 1-1/2 inch cylinder well supplied
with steam at from 30 to 40 lbs. per square inch.


A Horizontal Boiler.

[Illustration: FIG. 82.--Longitudinal section of large water-tube
boiler.]

The boiler illustrated by Fig. 81 is designed for heating with a large
paraffin or petrol blow-lamp. It has considerably greater water capacity,
heating surface--the furnace being entirely enclosed--and water surface
than the boiler just described. The last at high-water level is about 60,
and at low-water level 70, square inches.

The vertical section (Fig. 82) shows 1/16-inch barrel, 13 inches long over
all and 12 inches long between the end plates, and 6 inches in diameter.
The furnace flue is 2-1/2 inches across outside, and contains eleven
1/2-inch cross tubes, set as indicated by the end view (Fig. 83), and 3/4
inch apart, centre to centre. This arrangement gives a total heating
surface of about 140 square inches. If somewhat smaller tubes are used and
doubled (see Fig. 84), or even trebled, the heating surface may be
increased to 180-200 square inches. With a powerful blow-lamp this boiler
raises a lot of steam.

Tubing the Furnace Flue.--Before any of the holes are made, the lines on
which the centres lie must be scored from end

Robert Laurence Bob Barr, Jr.[5] (born November 5, 1948) is the Libertarian Party nominee for President of the United States in the 2008 election.[6] He is a former federal prosecutor and a former member of the United States House of Representatives.[7] He represented Georgias 7th congressional district as a Republican from 1995 to 2003.[7][8]

Norman De Mattos Bentwich OBE MC (28 February 1883-8 April 1971) was a British barrister and legal academic who served as Legal Secretary and the first Attorney-General of Mandatory Palestine from 1918 to 1929. He was also President of the Jewish Historical Society. He was the eldest son of Herbert Bentwich.

Jack London (12 January 1876 22 November 1916)[1][2][3][4] was an American author who wrote The Call of the Wild and other books. A pioneer in the then-burgeoning world of commercial magazine fiction, he was one of the first Americans to make a lucrative career exclusively from writing.[5]

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