A laboratory guide for histology : laboratory outlines for the study of histology and microscopic anatomy / by Irving Hardesty ... With a chapter on laboratory drawing by Adelebert Watts Lee ... With 30 illustrations 2 of which are in colors.

  • Hardesty, Irving, 1866-
Date:
1908
Catalogue details

Licence: Public Domain Mark

Credit: A laboratory guide for histology : laboratory outlines for the study of histology and microscopic anatomy / by Irving Hardesty ... With a chapter on laboratory drawing by Adelebert Watts Lee ... With 30 illustrations 2 of which are in colors. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    are very useful. No. 8, for example, is useful for drawings in which con- siderable perspective is demanded. The advantage of this paper in micro- scopical drawing is that a great number of dots can be made in a surprisingly short time, simply by rubbing a pencil back and forth over its surface. Re- sults produced with pencil on five varieties of the board are shown in Fig. 3. Subsequent scratching out of these dots to represent either uncolored elements in the preparation, or places in it where the transmitted light comes through clefts in the tissues, will give remarkably realistic effects. Scratching is effected with great ease and accuracy since it merely consists in abrasion of the chalk sur- face of the board. Lines and shadows may be strengthened with the pen, and at need it takes wash excellently. A later figure (Fig. 5) is given illustrating the use of Ross board. Unfortunately, it is expensive. The half-sheets are usually retailed for 30 cents and the full sheets for 50 cents, and neither of these is very large. Pencils.—There is hardly a limit to the number of pencils which can be used to advantage, but for all practical purposes three of varying degrees of softness will suffice. Again, several firms manufacture pencils of repute, but for the sake of simplicity, there need be mentioned here only the well-known drawing pencils made by Faber and the Koh-I-Noor, made by L. & C. Hardt- muth in Austria. The grade known as 4H will be found hard enough for the finest and lightest of lines. HB is a good grade for the placing of outlines, while 5B is as soft and black as usual work will demand for the laying of massed color. Even in cases demanding extreme hardness, the 6H will be sufiicient. These pencils are usually sold at 10 cents straight. Erasers.—These are divided into two classes, one for pencil and one for pen-work. A casual glance at the supply of these in any well-stocked art store is sufficient to bewilder the beginner. But one suggestion will be of service in selecting a pencil-eraser: Do not purchase a hard, colored article. Hard erasers destroy the surface of the drawing-paper and colored ones, if used vigorously, are very apt to leave their own tint upon the paper. The so-called ink-erasers had also better be avoided entirely, as they either fail to work at all or they sadly abuse the surface of the material drawn upon, x^ny small, well-sharpened knife-blade, gradually and carefully applied, is much more a tool of choice in the removal of ink than the ready-made erasers. Good pencil-erasers are made by Hardtmuth, stamped with a large H and should not cost more than 10 cents at the most. Any eraser chosen should be soft and should wear rapidly when applied to the paper. Pens.—Here again one meets with a well nigh infinite assortment. Still, two pens of long-established worth will meet all the demands laid upon the beginner, and are described as follows: Joseph Gillott's Lithographic Pen, No. 290, is one of very fine point and, for placing delicate lines, it will give entire satisfaction. Its point, however, is so flexible that an unsteady hand often robs it of its best work. Gillott's Lithographic Crow Quill, No. 659, is of more rigidity and, in consequence, the beginner will do better line-drawing with it