## 3 Results
### Magnetic Susceptibility of Some Construction Materials for Pavilions
#### 3.1.1 Magnetic Susceptibility Determinations
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Material** & **Measurement No.** & \begin{tabular}{c} \(\kappa\) (l. v.), \\ \(\times 10^{-5}\) SI Units, \\ \end{tabular} & \begin{tabular}{c} \(\kappa\) (s. v.), \\ \(\times 10^{-5}\) SI Units \\ \end{tabular} & \
\begin{tabular}{c} **Correction Factor** \\ \(\times 10^{-5}\) SI Units \\ \end{tabular} &
\begin{tabular}{c} **Total \(\kappa\),** \\ \(\times 10^{-5}\) SI Units \\ \end{tabular} & **Conclusion** \\ \hline Asphalt shingle & 1 & 363.3 & - & - & 363.3 & \\ Asphalt shingle & 2 & 332.5 & - & - & 332.5 & Medium \\ (onduline) & 3 & 306.3 & - & - & 306.3 & magnetization \\  & 4 & 233.9 & - & - & 233.9 & \\ \hline Perfekta & 1 & 0 & 0 & 1.4 & 0 & \\ Multifix glue (loose) & 2 & 0 & 0 & 1.4 & 0 & Very low \\  & 3 & 0 & 0 & 1.4 & 0 & magnetization \\  & 5 & 0 & 0 & 1.4 & 0 & \\ \hline  & 1 & 9.681 & 7.078 & 1.4 & 9.9092 & \\ Axton sand & 2 & 9.385 & 6.854 & 1.4 & 9.5956 & \\ concrete & 3 & 9.138 & 6.493 & 1.4 & 9.0902 & Very low \\ powder & 4 & 8.546 & 6.566 & 1.4 & 9.1924 & magnetization \\  & 5 & 10.76 & 6.765 & 1.4 & 9.471 & \\ \hline  & 1 & 121.8 & 78.01 & 1.4 & 109.214 & \\  & 2 & 143 & 84.56 & 1.4 & 118.384 & \\ Extended clay & 3 & 151.2 & 83.14 & 1.4 & 116.396 & Very low \\  & 4 & 117.2 & 102.9 & 1.4 & 144.06 & magnetization \\  & 5 & 184 & 105.6 & 1.4 & 147.84 & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Magnetic susceptibility of materials used for construction of a pavilion and a pillar at the White Sea observatory. proposed to use some new composite materials for the pavilion construction and especially for the exterior finish of the pavilions, as the observatory is located in a mountain region where abrupt weather changes can take place, and wooden exteriors could soon become worn due to weather impact. Therefore, it was decided to use wood for the construction of the interiors of both absolute and variation pavilions, as well as for the construction of the inner chamber of the variation pavilion. In turn, according to the project, the frames of the pavilions were supposed to be assembled from plastic C-shape channel bars joined with aluminum rivets (Figure 3a). For the outer walls, it was planned to use plastic with polypropylene and mineral wool fill (Figure 3b) and underlying pumice blocks (Figure 3c). For window frames, we intended to use plastic profiles (Figure 3d). The results of the magnetic susceptibility measurements of the main mentioned materials are provided in Table 4. The measurements were performed using the MFK-IFA laboratory kappameter except for a window frame profile (its magnetic susceptibility was identified using PIMV). Note that all of the specimens appeared to be practically non-magnetic. The pillars in the observation pavilions of the Gyulagarak observatory were also built from glass blocks using glue. The \(\kappa\) measurements for the glue are listed in Table 5, which is similar to Table 3 for the White Sea observatory. However, in this case, the total \(\kappa\) values converted from the \"small volume\" \(\kappa\) values appeared to be less close to corresponding \"large volume\" \(\kappa\) values. Nevertheless, all glue samples, both loose and solid, appeared to be very low magnetizable and, therefore, suitable for pillar construction. Figure 3: Samples of construction materials used for building the pavilions at the Gyulagarak magnetic observatory: (**a**) A fragment of two C-shape channel bars, joined with aluminum rivets; (**b**) plastic envelope for filling with polypropylene and mineral wool for thermal insulation; (**c**) pumice block fragment; (**d**) plastic profile for a window frame for the absolute pavilion. The construction process of the absolute pavilion is displayed in Figure 4a. Figure 4b shows an absolute pavilion of the GLK observatory as an example of the use of the mentioned materials, and Figure 4c shows the interior of the absolute pavilion.