. Catalogue : mathematical and engineering instruments and materials manufactured and imported by James W. Queen & A 812. A 812. half imperial size. 14 by VJ inches, royal size, 17 by -- inches, .imperial size, 19 by 28 inches, double elephant size, 24 by 38 i ixhes, Peick $,504, A 813. A 813. Drawing Board, pinewood, hardwood do. demy size, 15 by 21 inches, Do. do. royal size, 20 by 26 inchesp Do. do. imperial size, 23 by 31 inches, Do. do. double elephant size, 31 by 42 inches,Do. do. antiquarian size, 33 by 55
. Catalogue : mathematical and engineering instruments and materials manufactured and imported by James W. Queen & A 812. A 812. half imperial size. 14 by VJ inches, royal size, 17 by -- inches, .imperial size, 19 by 28 inches, double elephant size, 24 by 38 i ixhes, Peick $,504, A 813. A 813. Drawing Board, pinewood, hardwood do. demy size, 15 by 21 inches, Do. do. royal size, 20 by 26 inchesp Do. do. imperial size, 23 by 31 inches, Do. do. double elephant size, 31 by 42 inches,Do. do. antiquarian size, 33 by 55 inches, . The Drawing Board above illustrated is the best, and deserves recommendation, asit is the only one which possesses the qualities a good and true board should is made of pinewood, glued up to the required width, with the heart side of eachpiece of wood to the surface. A pair of hardwood battens are screwed to the back,the screws pass through the ledges in oblong slots, bushed with brass, which titsclosely under the heads, and yet allows the screws to move freelv when drawn by thecontraction of the board. To give the battens power to resist the tendency of thesurface to warp, a series of grooves aresunk in half the thickness of the board overHie entire back. These grooves take the transverse strength o
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Keywords: ., bookauthorjameswqu, bookcentury1800, bookdecade1880, bookyear1880
