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METRIC DEMONSTRATION MATERIAL FOR INSTRUCTION IN SCHOOLS AND COLLEGES.

X H X

No. 280.

CEN SCI

CO

280. Level tester. Composed of 2 No. 26C V supports, 2 No. 26B V supports, 1 No. 21 40 cm. rod and 1 No. 338B micrometer screw. Complete, without level...

280A. Level tester, page 488.

$7.50

[graphic][graphic][subsumed][subsumed][merged small]

281. Liter block.

No. 285.

An important adjunct in teaching density, as well as the
metric system. The block is loaded and has a graduated face, show-
ing 100 square centimeters on a side. It is dissectible to 1-10, 1-100,
and 1-1000 of its volume, each piece being weighted to the specific
gravity of water. (See also No. 285, liter case)..

283. Liter block, plain, neither loaded nor dissected..
285. Liter case, to be used in connection with No. 281 liter block. It is made
of cast aluminum, one side being of glass with etched graduation in
millimeters. This case is especially adapted for specific gravity work
and measuring irregular solids. It is the counterpart of the liter
block in hollow form. The glass face allows a full inspection of the con-
tents, the stopcock which is attached permits of a nicer adjustment and
measurement than is possible in common capacity measures, and the
graduations indicate exact amounts. If this case is put on a balance
and its weight exactly balanced, the addition of water shows an increase
of 10 grams of water for every millimeter of scale division, which is equal
to a centiliter or 10 c. c. of water. Any small solid, of however irregular
shape, may be measured in this case and its specific gravity taken with
a minimum of trouble..

28

2.75 .65

3.00

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[blocks in formation]

METRIC EQUIVALENTS SHOWN IN A CATALOGUE.

Table of decimal equivalents of millimeters and fractions of millimeters. 1 mm.=.0003937 inch.

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SAMPLE PAGE FROM UNITED STATES TOOL CATALOGUE, SHOWING TRANSLATION TABLES TO FACILITATE USE OF METRIC SYSTEM.

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DRILL-GAUGE TABLES SHOWING COMBINED METRIC AND

INCH SIZES.

[From a manufacturer's catalogue.]

Note the sequence from small to large.

Table of decimal equivalents for millimeter, drill gauge and fractional sizes.

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