The tubercles are present anterior to the first ridge plate
. The posterior ridge plate
is larger transversely than the anterior one.
To install the ridge plate, cut a 2 x 10 or larger dimensioned lumber, the length of the roof and attach it to the support.
Gabled roof framing relies on rafters that are attached to both sides of a ridge plate at the top of the gable and resting on beams at the bottom (Figure 31-7).
Connect the rafters to the ridge plate using joist hangers or a lag screw on the top and by toenailing with 16d nails on each side.
Ridge plates are structural pieces that support the high end of rafters in peaked roofs.
Osborn (1936) gives the ridge plate formulae for Mammuthus jeffersoni as: Dp3 8+/?, Dp4 12/13, M1 11/?, M2 18-19/19, and M3 25/24.
Characters of Mammuthus jeffersoni.--The teeth of mammoths, as well as those of the living elephants to which the mammoths are related, consist of alternating cement, dentine, and enamel ridge plates (Figure 1A; Plate III, Figures 1 and 2).
It is from an old individual; the anterior ridge plates of the last molars ([M.sub.3]) are worn down to their roots.
L[M.sup.3] has 26 ridge plates, of which 18 make up the grinding-surface.
Osborn (1936) gives the ridge plate
formulae for Mammuthus jeffersoni as: Dp3 [8+]/?, Dp4 12/13, M1 11/?, M2 [18-19]/19, and M3 25/24.
Molars of the Jefferson mammoth are known to consist of alternating transverse ridge plates composed of cement, dentine, and enamel, the third molar is the largest tooth; the upper third molar generally has 25 ridge plates, the lower third molar 24.
The third molar of the Jefferson mammoth described in this paper appears to be from the lower jaw; it has 24 ridge plates; 9 plates span 100 mm (Figure 3).