6H

The 6H is the hardest; the 6B is the softest in the series.

Drawing Tools and Tips for Beginners 2007

A set of pencils, from 6H (very hard lead) all the way down to 6D (very soft lead)

Drawing Tools and Tips for Beginners 2007

LCRI 21.2A has been renumbered 21.2C; LCRI 1.6H, LCRI 1.6J, LCRI 25.3, and LCRI 26.5A have been revised.21.3A2: The rule for entry for multipart monographs has been revised to retain the main entry for the first or earliest part when responsibility changes on the later parts.

AACR at LC David Bigwood 2004

LCRI 21.2A has been renumbered 21.2C; LCRI 1.6H, LCRI 1.6J, LCRI 25.3, and LCRI 26.5A have been revised.21.3A2: The rule for entry for multipart monographs has been revised to retain the main entry for the first or earliest part when responsibility changes on the later parts.

Archive 2004-08-01 David Bigwood 2004

This salt occurs in nature in sea water, in the mineral sylvine, and, combined with magnesium chloride, as carnallite (KCl·MgCl_ {2} ·6H_ {2} O).

An Elementary Study of Chemistry William McPherson

Al_ (CO_ ) _ + 6H_ O = 2Al (OH) _ + 3H_ CO_ .

An Elementary Study of Chemistry William McPherson

Figure 6H represents a section through the plane 820 of figure 6A.

Development of the Digestive Canal of the American Alligator C. M. [Illustrator] Reese

Use hard pencils when learning to sketch -- 4H to 6H -- and go over your work afterwards with a softer pencil -- 2H.

Manual of Military Training Second, Revised Edition 1906

~ -- The crystallised salt is CaCl_ {2}. 6H_ {2} O; dried at

A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886

~Uranium Nitrate~, UO_ {2} (NO_ {3}) _ {2}. 6H_ {2} O. -- This salt is very soluble in water and is sometimes used instead of the acetate, which is somewhat difficult to dissolve.

A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886