FAMILIAR FACTS.

Taranaki Daily News, Volume L, Issue 60, 27 July 1907, Page 3

FAMILIAR FACTS.

To find circumference of a circle mul(tipl} diameter by 3.1416 To find urea of „ t rian ]o Jnulti , pase by '/„ perpendicular height s„.• s,ir^ l ° f !i scjuaio of uinmcter l>v 3 1410 ' J*** wli ( ' lU - v ; °' f a "I'lieix- m,.llij.lv eulm of din meter bv .523(>. ' To find side of (ill equal square multilily diameter by .SBO2. To find pubic inches in „ | JaII multiply ( nl" of diameter by ./)23G. "oiil)l% the diameter of a ~i,,0 in creases its capacity four times A culiic foot of water contains pilous, 1-.4 H cubic inches, and weighs .

.T" 'find tlie pressure in n,, s (1 mcl, of a column of water multiply the height or tlif column by .434.

Steam rising from water at its boilinr point 1212 degrees) has a pressure equal to flu- atmosphere (14.7 pounds to the sfpwc inch).

A standard horse power: The evanoratuior sn pounds of water per hour from a feed water temperature of Km decrees F., into steam at 70 pounds gna"e pressure. ° '

To ascertain healing surface in tubular boilers multiply two-thirds of the circumference of lioiler by length of boiler 111 inches, and add to it: IV. area of all the tubes.

One-sixth of tensile sli..i ], of plat, multiplied by thick-lies- of |,| a t t . , lm i ( ]j vided by one half the diameter of lioilci gives safe working pressure for tubulin boilers. For marine boilers add 20 nci cent for drilled holes.