Math
310 addenda
The best CHEAP compass
resembles the ones on the LEFT side of this cased set, mfgd by Staedler:
Students have found similar
compasses alone and in a set with plastic protractor and ruler for under $5 at local
office supply stores.
(See BELOW)
Here’s another one offered
by American Science and Surplus, about $4, better than you need:
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(also available through Amazon and other retailers) (about $4)
Note the screw in the
middle TAKES TIME TO ADJUST; the compass won’t easily slip, however.
Another acceptable compass,
also with screw adjustment:
Maker: Alvin
about $5
CHEAP but USABLE
compasses:
By Helix:
A professional style,
friction-type compass for school use. Die-cast, nickel-plated construction with
ribbed nylon pencil-retaining ring for holding regular wood-cased pencils. One 3" (7.5 cm) pencil is included.
Shortened safety point. Makes circles up to 11" (28 cm) in diameter.
About $1.50
COMPACT, FAIRLY SAFE, CHEAP and works!
C-Thru's Compass and
Protractor Set includes compass and protractor with built-in ruler. (about $3):
Draw precise circles with the precision
metal compass. It has a spring-bow head and the center wheel has a nickel
finish that resists rust. The maximum circle diameter on the compass is approximately
10.375", while the compass's length is 6". The compass includes one
piece of drafting lead and an eraser.
NOTICE THIS COMPASS was packaged with a PROTRACTOR.
One student who had this
type was frustrated by it:
The following have “safety
point”, which usually means slip-and-slide inaccuracy and frustration.
Especially look out for the
ones with all-plastic “points”. They
are not very pointy, and are guaranteed to slip.
