"
"Here goes, then," replied Joe. "How big do they want to be?"
"Four inches square, the book says, and I suppose the man that wrote
it knew what he was talking about," said Bob. "That will do to start
on, anyway."
Joe carefully measured a square of paper to the required dimensions,
and then used it as a pattern in cutting out the others. He soon had
a number of neat squares ready, which he handed to Bob, who immersed
them in the melted wax.
While the paper was soaking this up, Joe cut out a corresponding
number of tinfoil squares, leaving a projecting tongue on each one
to serve as a terminal.
"You're an expert at carpenter work, Doughnuts," said Bob. "If you
feel as ambitious as usual you can cut a couple of squares out of
that oak plank over in the corner. We'll need them for end pieces
to this condenser."
"Oh, that will be lots of fun," said Jimmy, who had been casting
longing glances toward the old sofa. "I'd a good deal rather saw
some more wood than take it easy. How big shall I make them?"
"About five inches each way, I should say," answered Bob,
reflectively. "That will give us room to drill holes in each corner
to put the clamping bolts through. In that drawer under the table
you'll find some drills. I think a three-sixteenth drill ought to be
all right. There are four brass bolts in that bag on the table, and
you can measure them and see what size drill you'll need.
Pages:
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91