Things To Make

a revolving motor of the usual kind. But
it has the advantage of being very easy to make.

[Illustration: FIG. 37.--Electric reciprocating engine and battery.]

How it works.--The experimental engine, constructed in less than a couple
of hours, which appears in Fig. 38, consists of a coil, C, strapped down by
a piece of tin to a wooden bedplate; a moving plunger, P, mounted on a
knitting-needle slide rod, SR; a wire connecting rod, SR; a wooden crank,
K; and a piece of knitting-needle for crank shaft, on which are mounted a
small eccentric brass wipe, W, and a copper collar, D. Against D presses a
brass brush, B1 connected with the binding post, T1; while under W is a
long strip of springy brass against which W presses during part of every
revolution. T2 is connected to one end of the coil winding, and T1 through
a 4-volt accumulator or three dry cells, with the other end of the coil.
When W touches B2 the circuit is completed, and the coil draws in the
plunger, the contact being broken before the plunger gets home. The crank
rotates at a very high speed if there is plenty of battery power, all the
moving parts appearing mere blurs.


CONSTRUCTION.

The coil is made by winding 4 oz. of No. 32 cotton-covered wire (price 6d.
to 8d.) on a boxwood reel 2 inches long and 1-1/2 inches in diameter, with
a 9/16-inch central hole. Before winding, bore a hole for the wire through
one end of the reel, near the central part, and mount the reel on a lathe
or an improvised spindle provided with a handle of some kind. The wire
should be uncoiled and wound on some circular object, to ensure its paying
out regularly without kinking; which makes neat winding almost impossible.

Draw a foot of the wire through the hole in the reel, and drive in a tiny
peg--which must not protrude inwards--to prevent it slipping. Lay the
turns on carefully, forcing them into close contact, so that the next layer
may have a level bed. On reaching the end of the layer, be equally careful
to finish it neatly before

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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